U.S. Geological Survey 2007 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ofr07-1056_dn_pre_bathy.shp Ryan F. Thompson Michaela R. Johnson Michael J. Anderson 2007 U.S. Geological Survey Scientific Investigations Report 2007-1056 Reston, VA U.S. Geological Survey http://pubs.usgs.gov/of/2007/1056/ This geospatial data set contains the points collected by the echosounder on transects in the downstream project reach surrounding the construction area at River Mile 761.4 below Gavins Point Dam on the Missouri River in South Dakota. This survey provides channel cross sections approximately every 500 feet prior to construction of Emergent Sandbar Habitat near River Mile 761.4 The purpose of this CD is to provide project files and GIS coverages for Task 1 of the Military Interdepartmental Purchase Request to the U.S. Army Corps of Engineers. 2004 ground condition Complete Unknown -96.799768 -96.701205 42.670947 42.654850 None inlandWaters Hydrographic Survey None Missouri River below Gavins Point Dam none The Missouri River is a rapidly changing system. These data should not be used for vessel navigation. U.S. Geological Survey Ryan F. Thompson Hydrologist mailing and physical address

111 Kansas Ave SE

Huron SD 57324 605 352-4241 x225 rcthomps@usgs.gov Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 The Innerspace Technologies 456 dual-frequency echosounder was calibrated twice daily with bar checks. Vessel draft was measured with each bar check and used to calculate water depth. A CSI Wireless, Omnistar corrected differential GPS antenna mounted directly above the echosounder was used to collect the horizontal location of each depth measurement. Real-time kinematic GPS was used to measure water surface elevation at each transect, which was then used to calculate elevation of the channel bottom. Conversion to NGVD29 vertical datum was completed so that the data could be compared to existing COE benchmarks and gaging station data. The datum conversion was accomplished using the National Geodetic Survey's VERTCON program (http://www.ngs.noaa.gov/cgi-bin/VERTCON/vert_con.prl). The datum shift of -0.189 meters was the program output for benchmark U450 (pid NM1968), one of the primaries used to establish local control. Topologically clean Data points have been checked and attributed data collected in NAD83 UTM zone 14 meters. Some preliminary editing was completed by deleting bad data points in Hypack 2004 Data exported from hypack and an ArcInfo coverage was created. 2004 Attributes for ws_elev, bot_elev, depth, elev_88m, elev_88ft, and elev_29ft were added and populated. Additional bad data points were deleted as necessary. 2004 coverage was projected to South Dakota-South Stateplane coordinate feet 2004 Attributes for x-coord and y-coord were added using addxy 2005 Vector Entity point 174288 Point 4 State Plane Coordinate System 4002 42.833333 44.400000 -100.333333 42.333333 2000000.000000 0.000000 coordinate pair 0.000064 0.000064 survey feet North American Datum of 1927 Clarke 1866 6378206.400000 294.978698 National Geodetic Vertical Datum of 1929 0.1 Feet Attribute values Mean sea level 0.1 feet Attribute values ofr07-1056_dn_pre_bathy arc attribute table ARC/INFO ® GIS Software DEPTH water depth, in meters USGS depth depth USGS ELEV_88M Elevation of the channel bottom, meters, NAVD88 USGS elev_88m elevation of stream bottom, in meters, NAVD88 USGS FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. AREA Area of feature in internal units squared. ESRI Area is always zero for point coverages. Values are automatically generated. PERIMETER Perimeter of feature in internal units. ESRI Perimeter is always zero for point coverages. Values are automatically generated. OBJECTID object identifier USGS dnhyd_spl_ identifier USGS ELEV_88FT bottom elevation, NAVD88, in feet, calculated by elev_88ft = elev_88m * 3.28084 USGS elev_88ft bottom elevation, NAVD88, in feet, calculated by elev_88ft = elev_88m * 3.28084 USGS ELEV_29FT bottom elevation, feet, NGVD29, adjusted by subtracting VERTCON adjustment of -0.189 meters from elev_88m and multiplying by 3.28084 USGS elev_29ft bottom elevation, feet, NGVD29, adjusted by subtracting VERTCON adjustment of -0.189 meters from elev_88m and multiplying by 3.28084 USGS DNHYD_SPL_ identifier USGS dnhyd_spl_ identifier USGS DNHYD_SPL1 identifier USGS dnhyd_spl1 identifier USGS X_COORD South Dakota-South state plane coordinate easting, in feet USGS x_coord South Dakota-South state plane coordinate easting, in feet USGS Y_COORD South Dakota-South State Plane coordinate northing, in feet USGS y_coord South Dakota-South State Plane coordinate northing, in feet USGS U.S. Geological Survey Ask USGS - Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK_USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr041189it03 Downloadable Data The South Dakota and Nebraska Water Science Centers, the Water Resources Discipline (WRD) of the U.S. Geological Survey, and the U.S. Army Corps of Engineers make no guarantee nor offer any warranty concerning the accuracy, condition, or application of the information contained in these geographic data. The burden for determining fitness for use of this data lies entirely with the user. Although these data have been used successfully on computers of WRD, no warranty, expressed or implied, is made by WRD regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the WRD have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including , but not limited to, any loss of profits arising out of the delivery, installation, operation, or support by WRD. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. ARCE 4.654 http://water.usgs.gov/GIS/dsdl/dn_pre_bathy.zip None 20070306 U.S. Geological Survey Ask USGS - Water Webserver Team mailing address

445 National Center

Reston VA 20192 USA 1-888-275-8747 (1-888-ASK_USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ofr07-1056_dn_pre_bathy.shp FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998