Krahulik, J.R. and Densmore, B.K. 2015 Version 1.0 vector digital data Reston, Virginia U.S. Geological Survey https://water.usgs.gov/lookup/getspatial?ds909_Upper_Hamburg_chute Krahulik, J.R., Densmore, B.K., Anderson, K.J., and Kavan, C.L. 2015 document U.S. Geological Survey Data Series 909 Reston, Virginia U.S. Geological https://pubs.usgs.gov/ds/0909/ An Innerspace 456 single-beam echosounder in conjunction with a Trimble® differential Global Positioning System (DGPS), HYPACK® navigation software, and Ashtech Z-Xtreme and Trimble® R8 Global Navigation Satellite System (GNSS) receivers was used to survey 7 chutes and 3 backwaters on the Missouri River yearly from 2011-13. These chutes and backwaters are located on the Missouri River between Newcastle, Nebraska and Rulo, Nebraska in the States of Nebraska, Iowa, and Missouri. Surveys of chutes consisted of topographic and bathymetric data collected along transects spaced 30.48 m apart from high bank to high bank. Surveys of backwaters consisted of topographic and bathymetric data collected along a transect grid of 76.2 m spacing. The data were collected by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers (USACE) Omaha District as part of the Missouri River Habitat Assessment and Monitoring Program. The purpose of this survey was to provide annual measurements of the chutes and backwaters for the USACE to calculate annual geomorphic change to understand chute and backwater evolution. This dataset is also used by the USACE for measuring the amount of shallow water habitat available for endangered species to comply with the "2000 Biological Opinion" and "2003 Amendment to the Biological Opinion" on the Missouri River as part of the their Habitat Assessment and Monitoring Program. 2011 2013 ground condition Complete None planned -95.7744 -95.7596 40.6184 40.5804 ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Thesaurus topography single-beam sonar bathymetry terrain GNSS hydrographic survey USGS Metadata Identifier USGS:c458f83c-b441-4486-952e-ebf06a7f7c0b Geographic Names Information System Missouri River Nebraska Iowa Missouri Iowa Council chute Plattsmouth chute Tobacco chute Upper Hamburg chute Lower Hamburg chute Kansas chute Deroin chute Ponca backwater Plattsmouth backwater Geographic Names Information System Upper Hamburg chute None The U.S. Geological Survey makes no guarantee nor offers any warranty concerning the accuracy, condition, or application of the information contained in this geographic data release. Although these data have been used successfully on computers of the USGS, no warranty, expressed or implied, is made by USGS 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 USGS 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 use of these data. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Justin R. Krahulik U.S. Geological Survey Hydrologic Technician mailing and physical

5231 S 19th St

Lincoln NE 68512 USA 1-402-328-4100 jkrahuli@usgs.gov https://water.usgs.gov/GIS/browse/ds909_Upper_Hamburg_chute.jpg Illustration of data set JPG Prepared in Cooperation with the U.S. Army Corps of Engineer Omaha District None Unclassified None HYPACK® 2013 and Trimble® Access; processed in Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.0.5.4400 and Microsoft® Excel® 2010 (14.0.7109.50000) SP1 MSO (14.0.7116.5000) HYPACK® 2013 document Online Hypack, Inc. http://www.hypack.com/new/Training/Documentation/tabid/239/DMXModule/1018/Default.aspx?EntryId=179 Reviewers examined attributes and elevation values. Surveys were completed along transects spaced at 30.48 or 76.2 m. Occasionally areas of transects were not able to be surveyed if depth and substrate were not adequate or weather did not permit. Horizontal accuracy is dependent on the accuracy of the GPS-surveyed position. There were two GPS/GNSS surveying methods used for this data collection effort. The first method, for horizontal position of the hydrographic sounding data, is DGPS. The stated horizontal accuracy for the DGPS is less than one meter assuming there are greater than 5 satellites, a Position Dilution Of Precision (PDOP) of less than 4, Signal to Noise Ratio (SNR) of greater than 6, elevation mask greater than 7.5, and a differential correction equivalent to a Trimble® 4000RSi. The second method, GPS/GNSS Real Time Kinematic (RTK) surveying, was used to survey the banks and shallow water areas. GPS/GNSS RTK surveying used either an Ashtech Z-Xtreme receiver and Geodetic IV revision "A" antenna or a Trimble® R8 antenna. RTK surveys were completed using USGS established benchmarks utilizing the NGS Online Positioning Users Service (OPUS). The peak-to-peak error estimates in the latitudinal and longitudinal directions calculated by OPUS ranged from 0.006 to 0.020 m and 0.001 to 0.034 m respectively. GPS accuracy is not only determined by the base station accuracy, but also by the accuracy of the rover unit. Only data with a "fixed” position (where the exact number of radio wavelengths between the satellites and the base station antenna were calculated -- a process known as ambiguity resolution -- to yield a whole number, or integer) were used for topographic surveys. The receiver accuracy is 1 centimeter + 2 ppm (based on the distance the rover is from the base)for RTK points with five satellites and PDOP less than 4. 1.0 m Accuracy for DGPS used to locate hydrographic soundings 0.044 m Accuracy of topographic data points collected using RTK GPS/GNSS surveying methods Vertical accuracy is dependent on the accuracy of the GPS-surveyed elevation and the accuracy of the depth estimation. The GPS survey is based off USGS established benchmarks utilizing the NGS OPUS. The benchmarks processed through OPUS with peak-to-peak error estimates in the ellipsoid ranging from 0.012 to 0.035 m and in the orthometric ranging from 0.022 to 0.059 m. GPS elevation accuracy is not only determined by the base station accuracy, but also by the accuracy of the rover unit. The rover unit used during terrestrial and bathymetric surveying was either an Ashtech Z-Xtreme receiver and Geodetic IV revision "A" antennae or a Trimble® R8 antenna. Only data coded as a "fixed" position by the GPS/GNSS receivers are used to determine water-surface elevations and topographic elevations. The accuracy of the receivers is 2 centimeters + 2 ppm (based on the distance the rover is from the base)with 5 satellites and a PDOP of less than 4. Depth was determined by using an Innerspace 456 single-beam echosounder. Echosounder depth estimates can be affected by the motion of the boat most generally pitch and roll. Depth was collected in a manner that minimized these factors by not allowing movement around the boat during data collection and by not collecting data during times of high wind/rough water. The stated accuracy for the echosounder is +/- 0.15 meters. 0.15 m Accuracy for DPGS used to locate hydrographic soundings 0.08 m Accuracy of topographic data points collected using RTK GPS/GNSS surveying methods Surveys were collected during the summer of 2011-13. Surveys consisted of GNSS topographic surveys utilizing either an Ashtech Z-Xtreme receiver and Geodetic IV revision "A" antennae or a Trimble® R8 antenna. The survey extent included high bank to edge of water and some in channel locations where depth permitted. Bathymetric data were collected using an Innerspace 456 echosounder with an 8° beam and HYPACK® navigation software in conjunction with a Trimble® Ag 132 DGPS. Unknown GNSS data were exported and corrected based on benchmark position as processed through OPUS-S (USGS Level II static methods) and exported as xyz text. Unknown Bathymetric data were processed using HYPACK® single beam editor using a centerline slope model for elevation from water surface elevation collected during the GNSS survey. Data was then exported as xyz text. Unknown Vector Entity point 393152 Universal Transverse Mercator 15 0.9996 -93.0 0 500000.0 0 coordinate pair 0.00000000222002416450096 0.00000000222002416450096 meters North American Datum of 1983 GRS 1980 6378137 298.257222101 North American Vertical Datum of 1988 0.01 meters Explicit elevation coordinate included with horizontal coordinates ds909_Upper_Hamburg_chute Bathymetric and topographic data collected at Upper Hamburg chute in 2011-13 U.S. Geological Survey Date Gregorian date U.S. Geological Survey Date mm/dd/yyyy U.S. Geological Survey Method Describes if the XYZ coordinate was collected by bathymetry or GNSS survey U.S. Geological Survey Bathymetry or RTK_GNSS Survey method used to collect each data point U.S. Geological Survey GEOID Describes the Geoid model used for each XYZ coordinate U.S. Geological Survey GEOID12A or GEOID09 Geoid model used to calculate orthometric height from ellipsoid height. U.S. Geological Survey Northing_UTM15m Y or Northing coordinate in UTM zone 15 North meters U.S. Geological Survey 4495882.503 4500058.653 meter 0.01 Based on equipment accuracy stated by manual 10 millimeters (mm) + 1 ppm root mean square (RMS) for horizontal position None planned Easting_UTM15m X or Easting Coordinate in UTM zone 15 meters U.S. Geological Survey 265188.369 266544.530 meter 0.01 Based on equipment accuracy stated by manual 10 millimeters (mm) + 1 ppm root mean square (RMS) for horizontal position None planned Horizontal_Datum Describes the datum used for the XY coordinate position U.S. Geological Survey NAD83 (2011) or NAD83 (CORS96) Horizontal datum realization U.S. Geological Survey Ortho_NAVD88m The Orthometric height or elevation of the Z coordinate using the North American Vertical Datum of 1988 in meters U.S. Geological Survey 259.83 284.073 meter 0.02 Based on equipment accuracy stated by manual 20 mm + 1 ppm RMS vertical position None planned U.S. Geological Survey Michael Ierardi IT Specialist mailing and physical

445 National Center

Reston Virginia 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov Downloadable Data The U.S. Geological Survey makes no guarantee nor offers any warranty concerning the accuracy, condition, or application of the information contained in this geographic data release. Although these data have been used successfully on computers of the USGS, no warranty, expressed or implied, is made by USGS 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 USGS 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 use of these data. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. ASCII Online accessible data WinZip compressed file 2.251 https://water.usgs.gov/GIS/dsdl/ds909_Upper_Hamburg_chute_csv.zip Access links through the USGS Publications Warehouse associated with the Larger Works Citation. None. This dataset is provided by the USGS as a public service. shapefile Online accessible data WinZip compressed file 9.034 https://water.usgs.gov/GIS/dsdl/ds909_Upper_Hamburg_chute_shp.zip Access links through the USGS Publications Warehouse associated with the Larger Works Citation. None. This dataset is provided by the USGS as a public service. 20201117 U.S. Geological Survey Ask USGS - Water Webserver Team mailing

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Reston Virgina 20192 USA 1-888-275-8747 (1-888-ASK-USGS) mierardi@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998