Alan Rea Kenneth D. Skinner 2009 http://water.usgs.gov/lookup/getspatial?ds412_statewidelayers Alan Rea Kenneth D. Skinner 2009 raster and vector digital data U.S. Geological Survey Data Series 412 Reston, Virginia U.S. Geological Survey http://pubs.usgs.gov/ds/412/ This dataset consists of a workspace (folder) containing four gridded datasets and a personal geodatabase. The gridded datasets are a grid of mean annual precipitation, a grid of forest land cover, and region grids used in the Idaho StreamStats application. One region grid is for peak flow estimates, the other is for low flows, mean annual flows, and monthly flow statistics. The personal geodatabase contains a polygon feature class of exclusion polygons, which identify areas in which use the StreamStats application is restricted. The forest and precipitation grids are used to compute percent forested area and mean annual precipitation, respectively, for basins that have been edited by the user within the StreamStats web application. The same grids were used to compute continuous parameter grids for percent forested area and mean annual precipitation. The continuous parameter grids are distributed with the ArcHydroHUC data sets for each 8-digit HUC, and provide percent forested area and mean annual precipitation estimates for unedited basins. The region grids are used to identify which regional regression equations to apply for estimating streamflow statistics in Idaho. The exclusion polygons are used to restrict or prevent use of the StreamStats application in areas where results may be invalid, or where its use is to be prevented for various reasons. Several USGS reports in recent years used these grids in developing regression equations for streamflow statistics. The reports and citations are as given below: id_pkreg -- Berenbrock, 2002; Hortness and Berenbrock, 2003 id_lowreg -- Hortness and Berenbrock, 2001; Hortness, 2006; Wood and others, 2009 forestg -- All below except Wood and others (2009) precip_combo -- All below Full Citations: Berenbrock, Charles, (2002), Estimating the magnitude of peak flows at selected recurrence intervals for streams in Idaho, U.S. Geological Survey Water Resources-Investigations Report 2002-4170. Hortness, J. E., (2006), Estimating low-flow frequency statistics for unregulated streams in Idaho, U.S. Geological Survey Scientific Investigations Report 2006-5035, 31 p. Hortness, J. E., and Berenbrock, Charles, (2001), Estimating monthly and annual streamflow statistics at ungaged sites in Idaho, U.S. Geological Survey Water Resources-Investigations Report 2001-4093, U.S. Geological Survey. Hortness, J. E., and Berenbrock, Charles, (2003), Estimating the magnitude of bankfull flows for streams in Idaho, U.S. Geological Survey Water Resources-Investigations Report 2003-4261, U.S. Geological Survey. Wood, M.S.., Rea, Alan., Skinner, K.D, and Hortness, J.E., (2009), Estimating locations of perennial streams in Idaho using a Generalized Least-Squares regression model of 7-day, 2-year low flows: U.S. Geological Survey Scientific Investigations Report 2009-5015, 26 p. 2009 publication date Complete None planned -120.686373 -108.421923 49.858931 39.651369 None streamflow statistics streamstats inlandWaters precipitation land cover forested area GCMD Location Keywords NORTH AMERICA UNITED STATES UNITED STATES OF AMERICA Idaho ID None None U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds412_statewidelayers Although the region grids are 10-meter resolution, they were created by projecting and resampling 30-meter resolution grids. Therefore, the true spatial resolution of the region grids is 30 meters. The regions extend outside the state of Idaho to encompass full watersheds above the gages used to develop the regression equations. The regression equations, however, generally are considered valid only within Idaho. Myron Molnau Cindy Newton 1995 map http://snow.ag.uidaho.edu/Climate/reports.html 1000000 online 1961 1990 ground condition id_precip mean annual precip within Idaho C. Daly G. Taylor 1998 raster digital data Portland, OR Water and Climate Center of the National Resources Conservation Service grid-cell resolution 4 km http://www.ocs.orst.edu/prism/prism_new.html online 1961 1990 ground condition prism_precip mean annual precip outside of Idaho U.S. Geological Survey U.S. Environmental Protection Agency U.S. Forest Service National Oceanic and Atmospheric Administration 2001 1992 raster digital data http://landcover.usgs.gov/natllandcover.php disc 1992 ground condition NLCD92 Land cover (forested categories only) The original publications (2001-2003) by Hortness and Berenbrock contained page-size illustrations of the regression regions. The region boundaries were determined based on similarity of basin characteristics at stream-gage locations, geographic and geomorphic features such as mountain ranges or breaks between mountains and plains, and professional judgement. More detailed region boundaries were digitized for the Idaho StreamStats application in consultation with the original report authors. Most boundaries were defined by drainage basin divides. However, some were defined along geomorphic boundaries such as the break in slope between mountains and plains. The boundaries that follow drainage basin divides generally were mapped using 30-meter elevation models. Other boundaries generally were digitized on-screen using 1:24,000-scale digital raster graphics (scanned topographic maps). The maps were then rasterized at 30-meter resolution and projected to the US Albers projection to match the EDNA data being used for Idaho StreamStats. 2004 RegionGridsAlbers The grids were projected to Idaho Transverse Mercator projection (IDTM83). The cell size was changed from 30 to 10 meters during the projection operation. RegionGridsAlbers 20080612 IDSS_regions The precip grids were combined to cover whole study area, because id_precip covered only Idaho. The prism_precip and molnau grids were projected to IDTM projection (with old parameters but on NAD83), and resampled to 500-m grid-cell resolution. They were combined with the ESRI Grid Merge function. Later, the precip_combo grid was projected to the new IDTM83 projection, which added some large X, Y offsets, but otherwise is the same projection. id_precip prism_precip 20000707 precip_combo precip_prj The FOREST grid was created from the NLCD92 land cover data. The appended NLCD92 data were acquired from Naomi Nakagaki (USGS California Water Science Center). The grid was reclassified to a grid having cell value 1 for every cell in the forest category (values 41-43 in NLCD92), and having cell value 0 everywhere else. NLCD92 20030212 forestg The exclusion polygons were developed by tracing downstream using the flowdirection grids, or tracing downstream with the Streams3D features in the HUC_Net geometric network stored in the global.mdb geodatabase. The traces were done from the points where major streams entered the U.S. from Canada. The selected lines were then buffered with a buffer distance of 8 meters. This made the exclusion polygon completely include all of the stream grid cells for these major streams. Exclusion polygons from the previous version of StreamStats also were added for the eastern Snake River Plain (an undefined area for streamflow regression equations), and an area surrounding the state boundary buffered by a distance of 1 kilometer. An exclusion polygon also was made for the Snake River below the confluence with the Owyhee River because parts of the Owyhee River basin were not processed. Several other river basins entering the Snake River from the west below this point also were not processed. 20080915 ExcludePolys Transverse Mercator 0.999600 -114.000000 42.000000 2500000.000000 1200000.000000 coordinate pair 10 10 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 id_lowreg.vat Grid value attribute table ESRI Rowid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Region ID number StreamStatsDB Region IDs assigned in StreamStatsDB, may change when equations are updated in DB. COUNT Number of grid cells having that value ESRI Dependent on size of grid and region ID_LOWREGNO ID regression region number See list of reports in Supplemental Information 0 Undefined area See Supplemental Information for list of reports using these region definitions. 1 Idaho low flows region 1 See Supplemental Information for list of reports using these region definitions. 2 Idaho low flows region 2 See Supplemental Information for list of reports using these region definitions. 3 Idaho low flows region 3 See Supplemental Information for list of reports using these region definitions. 4 Idaho low flows region 4 See Supplemental Information for list of reports using these region definitions. 5 Idaho low flows region 5 See Supplemental Information for list of reports using these region definitions. 6 Idaho low flows region 6 See Supplemental Information for list of reports using these region definitions. 7 Idaho low flows region 7 See Supplemental Information for list of reports using these region definitions. 8 Idaho low flows region 8 See Supplemental Information for list of reports using these region definitions. id_pkreg.vat Grid value attribute table ESRI Rowid Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. VALUE Region ID number StreamStatsDB Region IDs assigned in StreamStatsDB, may change when equations are updated in DB. COUNT Number of grid cells having that value ESRI Dependent on size of grid and region ID_PKREGNO Idaho regression region number See list of reports in Supplemental Information 0 Undefined area See Supplemental Information for list of reports using these region definitions. 1 Idaho peak flows region 1 See Supplemental Information for list of reports using these region definitions. 2 Idaho peak flows region 2 See Supplemental Information for list of reports using these region definitions. 3 Idaho peak flows region 3 See Supplemental Information for list of reports using these region definitions. 4 Idaho peak flows region 4 See Supplemental Information for list of reports using these region definitions. 5 Idaho peak flows region 5 See Supplemental Information for list of reports using these region definitions. 6 Idaho peak flows region 6 See Supplemental Information for list of reports using these region definitions. 7a Idaho peak flows region 7a See Supplemental Information for list of reports using these region definitions. 7b Idaho peak flows region 7b See Supplemental Information for list of reports using these region definitions. 8 Idaho peak flows region 8 See Supplemental Information for list of reports using these region definitions. Exclude_polys Personal geodatabase feature attribute table ESRI OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. ExcludeCode Code that specifies behavior of the StreamStats application when delineation point falls within polygon StreamStats 1 Delineation is not allowed StreamStats All other values Delineation is allowed. Warning is given to user. StreamStats ExcludeReason Reason for warning or restriction StreamStats Text description of reason for restriction Shape_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. Shape_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. U.S. Geological Survey Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds412_statewidelayers Although these data have 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. 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 these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. ESRIWS 9.2 ESRI Workspace 86 MB http://water.usgs.gov/GIS/dsdl/ds412/index.html None. This dataset is provided by USGS as a public service. 20080915 U.S. Geological Survey Ask USGS Ask USGS -- Water Webserver Team mailing address

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Reston VA 20192 USA 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds412_statewidelayers FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998