Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project

Char, Stephen J., and Arnold, L.R. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr02-338_bedrock U.S. Geological Survey 1999 Colorado Front Range Infrastructure Resources Project report Open-File Report OFR 99-001 Denver, Colorado U.S. Geological Survey accessed March 25, 2002 http://pubs.usgs.gov/ds/2006/193/intro.html The U.S. Geological Survey developed this dataset as part of the Colorado Front Range Infrastructure Resources Project (FRIRP). One goal of the FRIRP was to provide information on the availability of those hydrogeologic resources that are either critical to maintaining infrastructure along the northern Front Range or that may become less available because of urban expansion in the northern Front Range. This dataset extends from the Boulder-Jefferson County line on the south, to the middle of Larimer and Weld Counties on the North. On the west, this dataset is bounded by the approximate mountain front of the Front Range of the Rocky Mountains; on the east, by an arbitrary north-south line extending through a point about 6.5 kilometers east of Greeley. This digital geospatial dataset consists of bedrock-surface-elevation contours that were generated with a Geographic Information System (GIS). This dataset was created by the U.S. Geological Survey (USGS) in the development of the USGS Front Range Infrastructure Resources Project. This dataset was used in the creation of 1:50,000-scale hydrogeologic contour maps. Using Arc/INFO software, USGS 7.5-minute Digital Elevation Models (DEMs) that encompass the study area were converted to raster surface formats (grids, in Arc/INFO terminology). They were mosaicked into a single continuous surface with the Arc/INFO GRID function, MERGE, and projected into an appropriate coordinate system with the command, PROJECT. To prevent the final bedrock-surface elevations contours from appearing too convoluted and implying more detail than is supportable by the unconsolidated-sediment-thickness dataset, the resulting grid was then smoothed using a circular averaging filter with a radius of 9 grid cells (180 meters), using the grid command, FOCALMEAN. Line datasets (coverages, in Arc/INFO terminology) of unconsolidated-sediment-thickness contours and bedrock-outcrop outlines (see Cross_Reference section) were converted to a grid with the same cell size as the DEM-derived data (approximate 30-meter spacing between data points) using the GRID command, TOPOGRID, which was set to run for 45 iterations with the primary z-value input as contour data, and no drainage enforcement. The unconsolidated-sediment-thickness grid was subtracted from the land-surface-elevation grid to produce a grid of bedrock-surface elevation. Using the bedrock-surface-elevation grid, the software generated the contour coverage at an interval of 20 feet. Manual editing corrected contours that were not correctly interpolated, as determined by consultation with the project hydrologist; for example, contours that formed closed polygons with perimeters less than 1,000 meters were removed. This coverage was clipped to fit the study-area boundary. The final coverage is intended to be used as one thematic layer in maps to be published at a scale of 1:50,000. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology. 20021007 publication date Complete None planned -105.298347 -104.598321 40.750170 39.913399 none bedrock geology hydrology inlandWaters none Colorado Denver Fort Collins Greeley Boulder None This dataset should not be used at a scale larger than 1:50,000. U.S. Geological Survey Colorado District Chief Colorado District Chief mailing address

PO BOX 25046 MS 415

Denver Colorado 80225-0046 United States 1-888-275-8747 303-236-4912 dc_co@usgs.gov Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700 Rafferty, Sharon A., Arnold, L.R., and Char, Stephen J. 20021007 Water-level-elevation contours vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Rafferty, Sharon A., Arnold, L.R., and Char, Stephen J. 20021007 Unconsolidated-sediment-thickness contours vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J., and Arnold, L.R. 20021007 Depth-to-water contours vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J., and Arnold, L.R. 20021007 Saturated-thickness polygons vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J., and Rafferty, Sharon A. 20021007 Study-area outlines vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J., and Rafferty, Sharon A. 20021007 Bedrock-outcrop outlines vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Char, Stephen J. 20021007 Digital geospatial datasets in support of hydrologic investigations of the Colorado Front Range Infrastructure Resources Project vector digital data Open-File Report OFR 02-338 Denver, Colorado U.S. Geological Survey Chain-node topology, as verified by ESRI Arc/INFO v. 7.x BUILD, is present. Information concerning completeness that is not contained in the Supplemental_Information element can be found in Robson and others (2000a, 200b, 2000c, 2000d). Maps of unconsolidated-sediment-thickness contours were prepared at 1:24,000 scale by hand-contouring data with 10- and 20-foot-contour intervals. These maps were produced directly from data and are considered to be first-order maps with a vertical accuracy of about 10 feet. These maps were then digitized for use in the GIS. Digital elevation models and the equivalent topographic quadrangle maps with 10- or 20-foot contour intervals are also considered to be first-order data with a vertical accuracy of 5 or 10 feet. Bedrock-surface elevation was computed as the difference between land-surface elevation and unconsolidated-sediment thickness. Bedrock-surface-elevation is considered to be a second-order dataset because it was computed from two first-order datasets. The contours likely have a vertical accuracy between 10 and 15 feet or about 4 meters. 4 No tests were performed to verify the Vertical Positional Accuracy Value. Babcock, H.M., and Bjorklund, L.J. 1956 Ground-water geology of parts of Laramie and Albany Counties, Wyoming, and Weld County, Colorado Document U.S. Geological Survey Water-Supply Paper 1367 Denver, Colorado U.S. Geological Survey paper 1956 publication date WSP 1367 lithologic and water-level data Barb, C.F. 1946 Selected well logs of Colorado Document Golden, Colorado School of Mines Quarterly v. 41, no. 1 Golden, Colorado Colorado School of Mines paper 1946 publication date none lithologic data Braddock, W.A., Calvert, R.H., Gawarecki, S.G., and Nutalaya, Prinya 1970 Geologic map of the Masonville quadrangle, Larimer County, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 832 Denver, Colorado U.S. Geological Survey 24000 paper 1970 publication date GQ-0832 lithologic data Braddock, W.A., Calvert, R.H., O'Conner, J.T., and Swann, G.A. 1989 Geologic map of the Horsetooth Reservoir quadrangle, Larimer County, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 1625 Denver, Colorado U.S. Geological Survey 24000 paper 1989 publication date GQ-1625 lithologic data Braddock, W.A., and Cole, J.C. 1978 Preliminary geologic map of the Greeley 1-degree by 2-degree quadrangle, Colorado and Wyoming Map U.S. Geological Survey Open-File Report 78-532 Denver, Colorado U.S. Geological Survey 250000 paper 1978 publication date OFR 78-532 lithologic data Braddock, W.A., Connor, J.J., Swann, G.A., and Wohlford, D.D. 1988 Geologic map of the Laporte quadrangle, Larimer County, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 1621 Denver, Colorado U.S. Geological Survey 24000 paper 1988 publication date GQ-1621 lithologic data Braddock, W.A., Houston, R.G., Colton, R.B., and Cole, J.C. 1988 Geologic map of the Lyons quadrangle, Boulder County, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 1629 Denver, Colorado U.S. Geological Survey 24000 paper 1988 publication date GQ-1629 lithologic data Braddock, W.A., Nutalaya, Prinya, and Colton, R.B. 1988 Geologic map of the Carter Lake Reservoir quadrangle, Boulder and Larimer Counties, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 1628 Denver, Colorado U.S. Geological Survey 24000 paper 1988 publication date GQ-1628 lithologic data Brookman, J.A. 1971 Colorado ground-water levels, spring 1971 Document Fort Collins, Colorado State University, Civil Engineering Department CER70-71JB58 Fort Collins, Colorado Fort Collins, Colorado State University paper 1971 publication date CER70-71JB58 water-level data Ching, P.W. 1972 Economic gravel deposits of the lower Cache La Poudre River Document Fort Collins, Colorado State University Master's thesis none Fort Collins, Colorado Fort Collins, Colorado State University paper 1972 publication date none lithologic data Code, W.E. 1958 Water table fluctuations in eastern Colorado Document Fort Collins, Colorado State University Agricultural Experiment Station Bulletin 500-S (CER58-WEC29) Fort Collins, Colorado Fort Collins, Colorado State University paper 1958 publication date 500-S (CER58-WEC29) water-level data Colton, R.B. 1978 Geologic map of the Boulder-Fort Collins-Greeley area, Colorado Map U.S. Geological Survey Miscellaneous Investigations Series Map 855-G Denver, Colorado U.S. Geological Survey 100000 paper 1978 publication date I-855-G lithologic data Colton, R.B., and Anderson, L.W. 1977 Preliminary geologic map of the Erie quadrangle, Boulder, Weld and Adams Counties, Colorado Map U.S. Geological Survey Miscellaneous Investigations Field Studies Map 882 Denver, Colorado U.S. Geological Survey 24000 paper 1977 publication date MF-0882 lithologic data Colton, R.B., and Fitch, H.R. 1974 Map showing potential sources of gravel and crushed-rock aggregate in the Boulder-Fort Collins-Greeley area, Front Range Urban Corridor Map U.S. Geological Survey Miscellaneous Investigations Series Map 855-D Denver, Colorado U.S. Geological Survey 100000 paper 1974 publication date I-855-D lithologic data Edgerton, G.K. 1974 Ground-water quality and alluvial aquifer thickness in the Eaton area, north of Greeley, Colorado Document University of Colorado Master's thesis, Unpublished none paper 1974 publication date none lithologic and water-level data Gaggiani, N.G. 1995 Ground-water flow and effects of agricultural applications of sewage sludge and other fertilizers on the chemical quality of sediments in the unsaturated zone and ground water near Platteville, Colorado, 1985-89 Document U.S. Geological Survey Water-Resources Investigations Report 94-4037 Denver, Colorado U.S. Geological Survey paper 1985 1989 title WRIR 94-4037 lithologic and water-level data Hall, D.C., Boyd, E.L., and Cain, D. 1979 Hydrologic data for wells, springs, and streams in Boulder County, Colorado Document U.S. Geological Survey Open-File Report 79-979 Denver, Colorado U.S. Geological Survey paper 1979 publication date OFR 79-979 water-level data Hershey, L.A., and Schneider, P.A., Jr. 1964 Ground-water investigations in the lower Cache La Poudre River basin, Colorado Document U.S. Geological Survey Water-Supply Paper 1669-X Denver, Colorado U.S. Geological Survey paper 1964 publication date WSP 1669-X water-level data Hershey, L.A., and Schneider, P.A., Jr. 1972 Geologic map of the lower Cache La Poudre River basin, north-central Colorado Map U.S. Geological Survey Miscellaneous Investigations Series Map 687 Denver, Colorado U.S. Geological Survey 62500 paper 1972 publication date I-687 lithologic data Hillier, D.E., Schneider, P.A., Jr., and Hutchinson, E.C. 1979 Hydrologic data for water-table aquifers in the greater Denver area, Front Range Urban Corridor, Colorado Document U.S. Geological Survey Open-File Report 79-214 Denver, Colorado U.S. Geological Survey paper 1979 publication date OFR 79-214 water-level data Hurr, R.T., and Luckey, R.R. 1972 Ground-water levels in the South Platte River Valley of Colorado, 1968-72 Document U.S. Geological Survey, Colorado Water Conservation Board Basic-Data Release 26 Denver, Colorado U.S. Geological Survey, Colorado Water Conservation Board paper 1968 1972 title none water-level data Hurr, R.T. 1973 Ground-water levels in the South Platte River Valley of Colorado, spring 1973 Document U.S. Geological Survey, Colorado Water Conservation Board Basic-Data Release 30 Denver, Colorado U.S. Geological Survey, Colorado Water Conservation Board paper 1973 publication date none water-level data Jenkins, E.D. 1961 Records and logs of selected wells and test holes and chemical and radiometric analyses of ground water in the Boulder area, Colorado Document U.S. Geological Survey, Colorado Water Conservation Board Basic-Data Release 5 Denver, Colorado U.S. Geological Survey, Colorado Water Conservation Board paper 1961 publication date none lithologic data Johncox, D.A., and Gaggiani, N.G. 1991 Selected hydrologic data for farmland treated with sewage sludge near Platteville, Colorado, 1985-91 Document U.S. Geological Survey Open-File Report 91-529 Denver, Colorado U.S. Geological Survey paper 1985 1991 title OFR 91-529 water-level data Machette, M.N. 1977 Geologic map of the Lafayette quadrangle, Adams, Boulder, and Jefferson Counties, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 1392 Denver, Colorado U.S. Geological Survey 24000 paper 1977 publication date GQ-1392 lithologic data Major, T.J., Kerbs, L., and Penley, R.D. 1975 Water-level records for Colorado Document U.S. Geological Survey, Colorado Water Resources Basic-Data Release 37 Denver, Colorado U.S. Geological Survey, Colorado Water Resources paper 1975 publication date none water-level data Major, T.J., Robson, S.G., Romer, J.C., and Zawistowski, Stanley 1983 Hydrogeologic data from parts of the Denver Basin, Colorado Document U.S. Geological Survey Open-File Report 83-274 Denver, Colorado U.S. Geological Survey paper 1983 publication date OFR 83-274 lithologic data Malde, H.E. 1955 Surficial geology of the Louisville quadrangle, Colorado Map U.S. Geological Survey Bulletin 996-E Denver, Colorado U.S. Geological Survey 24000 paper 1955 publication date B 996-E lithologic data McComas, M.R. 1966 Environmental control of inorganic water quality near Severance, Colorado Document Fort Collins, Colorado State University, Department of Geology Master's thesis, unpublished none paper 1966 publication date none lithologic data McConaghy, J.A., Chase, G.H., Boettcher, A.J., and Major, T.J. 1964 Hydrogeologic data of the Denver Basin, Colorado Document U.S. Geological Survey, Colorado Water Conservation Board Basic-Data Report 15 Denver, Colorado U.S. Geological Survey, Colorado Water Conservation Board paper 1964 publication date none lithologic and water-level data Meinzer, O.E. 1937 Water levels and artesian pressure in observation wells in the United States in 1936 Document U.S. Geological Survey Water-Supply Paper 817 Reston, Virginia U.S. Geological Survey paper 1936 title WSP 817 water-level data Meinzer, O.E., and Wensel, L.K. 1936 Water levels and artesian pressure in observation wells in the United States in 1935 Document U.S. Geological Survey Water-Supply Paper 777 Reston, Virginia U.S. Geological Survey paper 1935 title WSP 777 water-level data Meinzer, O.E., and Wensel, L.K. 1938 Water levels and artesian pressure in observation wells in the United States in 1937 Document U.S. Geological Survey Water-Supply Paper 840 Reston, Virginia U.S. Geological Survey paper 1937 title WSP 840 water-level data Meinzer, O.E., and Wensel, L.K. 1939 Water levels and artesian pressure in observation wells in the United States in 1938 Document U.S. Geological Survey Water-Supply Paper 845 Reston, Virginia U.S. Geological Survey paper 1938 title WSP 845 water-level data Meinzer, O.E., and Wensel, L.K. 1940 Water levels and artesian pressure in observation wells in the United States in 1939 Document U.S. Geological Survey Water-Supply Paper 886 Reston, Virginia U.S. Geological Survey paper 1939 title WSP 886 water-level data Meinzer, O.E., and Wensel, L.K. 1941 Water levels and artesian pressure in observation wells in the United States in 1940 Document U.S. Geological Survey Water-Supply Paper 910 Reston, Virginia U.S. Geological Survey paper 1940 title WSP 910 water-level data Meinzer, O.E., and Wensel, L.K. 1942 Water levels and artesian pressure in observation wells in the United States in 1941 Document U.S. Geological Survey Water-Supply Paper 940 Reston, Virginia U.S. Geological Survey paper 1941 title WSP 940 water-level data Meinzer, O.E., and Wensel, L.K. 1944 Water levels and artesian pressure in observation wells in the United States in 1942 Document U.S. Geological Survey Water-Supply Paper 948 Reston, Virginia U.S. Geological Survey paper 1942 title WSP 948 water-level data Meinzer, O.E., and Wensel, L.K. 1946 Water levels and artesian pressure in observation wells in the United States in 1943 Document U.S. Geological Survey Water-Supply Paper 990 Reston, Virginia U.S. Geological Survey paper 1943 title WSP 990 water-level data Roberts, Chuck 1995 Water levels in alluvial aquifers of the lower South Platte River Basin, Colorado Document Denver, Colorado Division of Water Resources none Denver, Colorado Colorado Division of Water Resources paper 1995 publication date none water-level data Robson, S.G. 1987 Bedrock aquifers in the Denver Basin, Colorado--A quantitative water-resources appraisal Document U.S. Geological Survey Professional Paper 1257 Denver, Colorado U.S. Geological Survey paper 1987 publication date PP 1257 unknown Robson, S.G. 1989 Alluvial and bedrock aquifers of the Denver Basin--Eastern Colorado's dual ground-water resource Document U.S. Geological Survey Water-Supply Paper 2302 Denver, Colorado U.S. Geological Survey paper 1989 publication date WSP 2302 unknown Robson, S.G. 1996 Geohydrology of the shallow aquifers in the Denver metropolitan area, Colorado Map U.S. Geological Survey Hydrologic Investigations Atlas 736 Denver, Colorado U.S. Geological Survey 50000 paper 1996 publication date HA-736 lithologic and water-level data Robson, S.G., Arnold, L.R., and Heiny, J.S. 2000 Geohydrology of the shallow aquifers in the Greeley-Nunn area, Colorado Map U.S. Geological Survey Hydrologic Investigations Atlas 746A Denver, Colorado U.S. Geological Survey 50000 paper 2000 publication date HA-746A lithologic and water-level data Robson, S.G., Arnold, L.R., and Heiny, J.S. 2000 Geohydrology of the shallow aquifers in the Fort Collins-Loveland area, Colorado Map U.S. Geological Survey Hydrologic Investigations Atlas 746B Denver, Colorado U.S. Geological Survey 50000 paper 2000 publication date HA-746B lithologic and water-level data Robson, S.G., Heiny, J.S., and Arnold, L.R. 2000 Geohydrology of the shallow aquifers in the Fort Lupton-Gilcrest area, Colorado Map U.S. Geological Survey Hydrologic Investigations Atlas 746C Denver, Colorado U.S. Geological Survey 50000 paper 2000 publication date HA-746C lithologic and water-level data Robson, S.G., Heiny, J.S., and Arnold, L.R. 2000 Geohydrology of the shallow aquifers in the Boulder-Longmont area, Colorado Map U.S. Geological Survey Hydrologic Investigations Atlas 746D Denver, Colorado U.S. Geological Survey 50000 paper 2000 publication date HA-746D lithologic and water-level data Robson, S.G., Van Slyke, George, and Graham, Glenn 1998 Structure, outcrop, and subcrop of the bedrock aquifers along the western margin of the Denver Basin, Colorado Map U.S. Geological Survey Hydrologic Investigations Atlas 742 Denver, Colorado U.S. Geological Survey 50000 paper 1998 publication date HA-742 lithologic data Sayre, A.N. 1947 Water levels and artesian pressure in observation wells in the United States in 1944 Document U.S. Geological Survey Water-Supply Paper 1020 Reston, Virginia U.S. Geological Survey paper 1944 title WSP 1020 water-level data Schneider, P.A., Jr. 1962 Records and logs of selected wells and test holes and chemical analyses of ground water in the South Platte River basin in western Adams and southwestern Weld Counties, Colorado Document U.S. Geological Survey, Colorado Water Conservation Board Basic-Data Report 9 Denver, Colorado U.S. Geological Survey paper 1962 publication date none lithologic and water-level data Schneider, P.A., Jr. 1983 Shallow ground water in the Boulder-Fort Collins-Greeley area, Front Range Urban Corridor, Colorado, 1975-1977 Map U.S. Geological Survey Water-Resources Investigations Report 83-4058 Denver, Colorado U.S. Geological Survey 100000 paper 1975 1977 title WRIR 83-4058 lithologic and water-level data Schneider, P.A., Jr., and Hershey, L.A. 1961 Records and logs of selected wells and test holes, and chemical analyses of ground water in the lower Cache La Poudre River basin, Colorado Document U.S. Geological Survey, Colorado Water Conservation Board, Ground-Water Series Basic-Data Report 8 Denver, Colorado U.S. Geological Survey, Colorado Water Conservation Board paper 1961 publication date none lithologic and water-level data Schneider, P.A., Jr., and Hillier, D.E. 1978 Hydrologic data for water-table aquifers in the Boulder-Fort Collins-Greeley area, Front Range Urban Corridor, Colorado Document U.S. Geological Survey Open-File Report 78-567 Denver, Colorado U.S. Geological Survey paper 1978 publication date OFR 78-567 water-level data Scott, G.R. 1982 Paleovalley and geologic map of northeastern Colorado Map U.S. Geological Survey Miscellaneous Investigations Series Map 1378 Denver, Colorado U.S. Geological Survey 250000 paper 1982 publication date I-1378 lithologic data Shelton, D.C. 1972 Thickness of alluvium and evaluaton of aggregate resources in the lower Cache La Poudre River valley, Colorado, by electrical resistivity techniques Document Boulder, University of Colorado Master's thesis none Boulder, Colorado Boulder, University of Colorado paper 1972 publication date none lithologic data Shelton, D.C., and Rogers, W.P. 1987 Environmental and engineering geology of the Windsor study area, Larimer and Weld Counties Map Colorado Geological Survey Report EG-9 Denver, Colorado Colorado Geological Survey 48000 and 96000 paper 1987 publication date EG-9 unknown Soister, P.E. 1965 Geologic map of the Fort Lupton quadrangle, Weld and Adams Counties, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 397 Denver, Colorado U.S. Geological Survey 24000 paper 1965 publication date GQ-397 lithologic data Soister, P.E. 1965 Geologic map of the Hudson quadrangle, Weld and Adams Counties, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 398 Denver, Colorado U.S. Geological Survey 24000 paper 1965 publication date GQ-398 lithologic data Soister, P.E. 1965 Geologic map of the Platteville quadrangle, Weld County, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 399 Denver, Colorado U.S. Geological Survey 24000 paper 1965 publication date GQ-399 lithologic data Spencer, F.D. 1961 Bedrock geology of the Louisville quadrangle, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 151 Denver, Colorado U.S. Geological Survey 24000 paper 1961 publication date GQ-151 lithologic data Stewart, B.A., and others 1967 Distribution of nitrates and other water pollutants under fields and corrals in the middle South Platte valley of Colorado Document Fort Collins, Colorado Agriculture Research Service 41-134 Fort Collins, Colorado Fort Collins, Colorado Agriculture Research Service, U.S. Department of Agriculture, Northern Plains Branch and Colorado Agricultural Experiment Station paper 1967 publication date ARS 41-134 lithologic data Stollar, R.I. 1969 Applications of geophysics in hydrogeology, Boxelder Creek Valley, Colorado Document Colorado State University Master's thesis none Fort Collins, Colorado Colorado State University paper 1969 publication date none lithologic data Trimble, D.E. 1975 Geologic map of the Niwot quadrangle, Boulder County, Colorado Map U.S. Geological Survey Geologic Quadrangle Map 1229 Denver, Colorado U.S. Geological Survey 24000 paper 1975 publication date GQ-1229 lithologic data Trimble, D.E., and Fitch, H.R. 1974 Map showing potential sources of gravel and crushed-rock aggregate in the greater Denver area, Front Range Urban Corridor Map U.S. Geological Survey Miscellaneous Investigations Series Map 856-A Denver, Colorado U.S. Geological Survey 100000 paper 1974 publication date I-856-A lithologic and water-level data Trimble, D.E., and Machette, M.N. 1979 Geological map of the greater Denver area, Front Range Urban Corridor, Colorado Map U.S. Geological Survey Miscellaneous Investigations Series Map 856-H Denver, Colorado U.S. Geological Survey 100000 paper 1979 publication date I-856-H lithologic data U.S. Geological Survey 1948 Water levels and artesian pressures in observation wells in the United States, 1945, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1027 Reston, Virginia U.S. Geological Survey paper 1945 title WSP 1027 water-level data U.S. Geological Survey 1949 Water levels and artesian pressures in observation wells in the United States, 1946, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1075 Reston, Virginia U.S. Geological Survey paper 1946 publication date WSP 1075 water-level data U.S. Geological Survey 1951 Water levels and artesian pressures in observation wells in the United States, 1947, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1100 Reston, Virginia U.S. Geological Survey paper 1947 title WSP 1100 water-level data U.S. Geological Survey 1951 Water levels and artesian pressures in observation wells in the United States, 1948, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1130 Reston, Virginia U.S. Geological Survey paper 1948 title WSP 1130 water-level data U.S. Geological Survey 1952 Water levels and artesian pressures in observation wells in the United States, 1949, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1160 Reston, Virginia U.S. Geological Survey paper 1949 title WSP 1160 water-level data U.S. Geological Survey 1952 Water levels and artesian pressures in observation wells in the United States, 1950, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1169 Reston, Virginia U.S. Geological Survey paper 1950 title WSP 1169 water-level data U.S. Geological Survey 1954 Water levels and artesian pressures in observation wells in the United States, 1951, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1195 Reston, Virginia U.S. Geological Survey paper 1951 title WSP 1195 water-level data U.S. Geological Survey 1955 Water levels and artesian pressures in observation wells in the United States, 1952, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1225 Reston, Virginia U.S. Geological Survey paper 1952 title WSP 1225 water-level data U.S. Geological Survey 1956 Water levels and artesian pressures in observation wells in the United States, 1953, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1269 Reston, Virginia U.S. Geological Survey paper 1953 title WSP 1269 water-level data U.S. Geological Survey 1956 Water levels and artesian pressures in observation wells in the United States, 1954, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1325 Reston, Virginia U.S. Geological Survey paper 1954 title WSP 1325 water-level data U.S. Geological Survey 1957 Water levels and artesian pressures in observation wells in the United States, 1955, part 5, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1408 Reston, Virginia U.S. Geological Survey paper 1955 title WSP 1408 water-level data U.S. Geological Survey 1963 Water levels and artesian pressures in observation wells in the United States, 1956-60, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1760 Reston, Virginia U.S. Geological Survey paper 1956 1960 title WSP 1760 water-level data U.S. Geological Survey 1968 Water levels and artesian pressures in observation wells in the United States, 1961-65, Northwestern States Document U.S. Geological Survey Water-Supply Paper 1845 Reston, Virginia U.S. Geological Survey paper 1961 1965 title WSP 1845 water-level data Wells, J.D. 1963 Preliminary geologic map of the Eldorado Springs quadrangle, Boulder and Jefferson Counties, Colorado Map U.S. Geological Survey Miscellaneous Investigations Series Map 383 Denver, Colorado U.S. Geological Survey 24000 paper 1963 publication date I-383 lithologic data Wilson, W.W. 1965 Pumping tests in Colorado Document U.S. Geological Survey, Colorado Water Conservation Board Circular 11 Denver, Colorado U.S. Geological Survey, Colorado Water Conservation Board paper 1965 publication date none water-level data Wrucke, C.T., and Wilson, R.F. 1964 Geology of the Boulder quadrangle, Colorado Map U.S. Geological Survey Open-File Map none Denver, Colorado U.S. Geological Survey 24000 paper 1964 publication date none lithologic data Colorado Division of Water Resources Unpublished material unpublished data--lithologic log data from wells and test holes, and water-level measurements in wells Document paper 1945 1997 dates are from data none lithologic and water-level data U.S. Geological Survey Unpublished material unpublished data--lithologic log data from wells and test holes, and water-level measurements in wells Document paper 1945 1997 dates are from data none lithologic and water-level data Colorado Department of Labor and Employment Unpublished material unpublished data--lithologic log data from wells and test holes, and water-level measurements in wells Document paper 1945 1997 dates are from data none lithologic and water-level data Colorado Geological Survey Unpublished material unpublished data--lithologic log data from wells and test holes, and water-level measurements in wells Document paper 1945 1997 dates are from data none lithologic and water-level data Colorado Department of Transportation Unpublished material unpublished data--lithologic log data from wells and test holes, and water-level measurements in wells Document paper 1945 1997 dates are from data none lithologic and water-level data See Supplemental Information. 20021007 Vector Complete chain 1261 Point 3264 Universal Transverse Mercator 13 0.999600 -105.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000256 0.000256 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 bedrock.aat vector attribute table U.S. Geolgical Survey FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. FNODE# Internal node number for the beginning of an arc (from-node). ESRI Whole numbers that are automatically generated. TNODE# Internal node number for the end of an arc (to-node). ESRI Whole numbers that are automatically generated. LPOLY# Internal node number for the left polygon. ESRI Whole numbers that are automatically generated. RPOLY# Internal node number for the right polygon. ESRI Whole numbers that are automatically generated. LENGTH Length of feature in internal units. ESRI Positive real numbers that are automatically generated. BEDROCK# Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. BEDROCK-ID User-defined feature number. ESRI Whole numbers. CONTOUR Bedrock-surface elevation, in feet above sea level. U.S. Geological Survey Integers evenly divisible by 20 ranging from 4520 to 6500. U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr02-338_bedrock Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Export Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/bedrock.e00.gz SDTS Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/bedr.tgz Shape Full coverage zipped 1 http://water.usgs.gov/GIS/dsdl/bedrock_shape.tgz None. This dataset is provided by USGS as a public service. 20041108 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

445 National Center

Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr02-338_bedrock FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998