This point data set contains streamflow-measurement sites in the Elkhorn and Loup River basins and selected streamflow-measurement sites in the Niobrara and Platte River basins in north-central Nebraska. At these 531 sites, flows ranging from no flow to 2,600 cubic feet per second were measured or observed during November 8 to 21, 2006. Measurements were made by several different methods, including current meters, flumes, and acoustic Doppler velocimeters. Each measurement site location was recorded using a handheld global positioning system (GPS) unit and then downloaded and stored in a computer spreadsheet. Stored coordinates were used to produce point features in GIS native format.

This data set contains 2,611 water levels collected by Natural Resources Districts in Central Nebraska. These water levels were collected by the districts to monitor groundwater levels within the districts. The water levels were provided to the USGS for use as calibration targets to the Elkhorn and Loup River Basin - Phase Three groundwater flow model. The water levels have not been previously published. This record serves as the publication record of the water levels in support of the Elkhorn and Loup River Basin - Phase Three groundwater flow model report.

This data set contains 2,611 water levels collected by Natural Resources Districts in Central Nebraska. These water levels were collected by the districts to monitor groundwater levels within the districts. The water levels were provided to the USGS for use as calibration targets to the Elkhorn and Loup River Basin - Phase Three groundwater flow model. The water levels have not been previously published. This record serves as the publication record of the water levels in support of the Elkhorn and Loup River Basin - Phase Three groundwater flow model report.

This data set contains two sets of measured water-level data collected in an area between the Platte and Elkhorn Rivers just above their confluence. Surface-water and groundwater-level data were collected for two synoptic water-level surveys during a low-groundwater demand period in fall of 2016 and a high groundwater demand period in summer of 2017. Elevations of surface-water features were surveyed with a Global Navigations Satellite System rover receiver using a real-time network, where the rover receiver receives real-time position corrections from a central server through a mobile wireless fidelity (Wi-Fi) hotspot linked to the rover receiver. Data collection procedures ensured that positions and elevations achieved USGS Level-IV survey accuracy and surveyed surface-water elevations were generally within 0.25 ft. Groundwater level data were collected from wells screened in the Quaternary-age alluvial aquifer. Prior to the groundwater-level data collection, the elevation of the selected wells was surveyed using a single base real-time kinematic (RTK) approach to achieve Level-II survey accuracy. The vertical accuracy generally was within 0.15 ft for each observation well. During synoptic water-level and streamflow surveys, groundwater-level measurements were furnished by Papio-Missouri River Natural Resources District (NRD) and Lower Platte North NRD staff or by transducers in Omaha Municipal Utilities District (MUD) recorder wells. Groundwater elevations used from recorder wells were calculated from the daily-median groundwater level from hourly recorded measurements. Additional data and interpretations of this dataset (published in SIR XXXX) and the data included in this Data Release are intended to inform water managers of the effect of groundwater demand and flow conditions on groundwater movement and interaction with surface-water for the area near and immediately upstream from the confluence of the lower Platte and Elkhorn Rivers.

This data set contains two sets of measured water-level data collected in an area between the Platte and Elkhorn Rivers just above their confluence. Surface-water and groundwater-level data were collected for two synoptic water-level surveys during a low-groundwater demand period in fall of 2016 and a high groundwater demand period in summer of 2017. Elevations of surface-water features were surveyed with a Global Navigations Satellite System rover receiver using a real-time network, where the rover receiver receives real-time position corrections from a central server through a mobile wireless fidelity (Wi-Fi) hotspot linked to the rover receiver. Data collection procedures ensured that positions and elevations achieved USGS Level-IV survey accuracy and surveyed surface-water elevations were generally within 0.25 ft. Groundwater level data were collected from wells screened in the Quaternary-age alluvial aquifer. Prior to the groundwater-level data collection, the elevation of the selected wells was surveyed using a single base real-time kinematic (RTK) approach to achieve Level-II survey accuracy. The vertical accuracy generally was within 0.15 ft for each observation well. During synoptic water-level and streamflow surveys, groundwater-level measurements were furnished by Papio-Missouri River Natural Resources District (NRD) and Lower Platte North NRD staff or by transducers in Omaha Municipal Utilities District (MUD) recorder wells. Groundwater elevations used from recorder wells were calculated from the daily-median groundwater level from hourly recorded measurements. Additional data and interpretations of this dataset (published in SIR XXXX) and the data included in this Data Release are intended to inform water managers of the effect of groundwater demand and flow conditions on groundwater movement and interaction with surface-water for the area near and immediately upstream from the confluence of the lower Platte and Elkhorn Rivers.

The U.S. Geological Survey (USGS), in cooperation with the Wyoming Water Development Office, developed streamflow statistics for active (through September 30, 2021) and discontinued USGS streamgages in and near Wyoming with 10 or more years of daily mean streamflow record. The computation of streamflow statistics for USGS streamgages is part of a larger study to develop a StreamStats application (www.usgs.gov/streamstats) for the State of Wyoming (https://www.usgs.gov/centers/wyoming-montana-water-science-center/science/wyoming-streamstats). StreamStats is a web-based computer program that can be used to delineate drainage areas, determine basin characteristics, and compute streamflow statistics at locations with and without streamgages (https://streamstats.usgs.gov/ss/; Ries and others, 2024). Streamflow at each streamgage was assessed for degree of human alteration owing to dams and diversions before streamflow statistics were computed. Streamflow records from 631 streamgage periods of record were used to compute basic, seasonal, and flow-duration statistics; records for 390 streamgage periods of record were used to compute n-day statistics and statistics that can be used for regional regression. Methods used to compute the summary statistics contained in this data release are described in an accompanying report (Armstrong and others, 2025).

The U.S. Geological Survey (USGS), in cooperation with the Wyoming Water Development Office, developed streamflow statistics for active (through September 30, 2021) and discontinued USGS streamgages in and near Wyoming with 10 or more years of daily mean streamflow record. The computation of streamflow statistics for USGS streamgages is part of a larger study to develop a StreamStats application (www.usgs.gov/streamstats) for the State of Wyoming (https://www.usgs.gov/centers/wyoming-montana-water-science-center/science/wyoming-streamstats). StreamStats is a web-based computer program that can be used to delineate drainage areas, determine basin characteristics, and compute streamflow statistics at locations with and without streamgages (https://streamstats.usgs.gov/ss/; Ries and others, 2024). Streamflow at each streamgage was assessed for degree of human alteration owing to dams and diversions before streamflow statistics were computed. Streamflow records from 631 streamgage periods of record were used to compute basic, seasonal, and flow-duration statistics; records for 390 streamgage periods of record were used to compute n-day statistics and statistics that can be used for regional regression. Methods used to compute the summary statistics contained in this data release are described in an accompanying report (Armstrong and others, 2025).

This data set contains two sets of water-level contours that represent interpreted water-levels for an area between the Platte and Elkhorn Rivers upstream of their confluence. The contours are informed by surface-water and groundwater-level data collected during a synoptic water-level survey completed during a low-groundwater demand period in fall of 2016 and a synoptic water-level survey completed during a high-groundwater demand period in summer of 2017. Additional data and interpretations of this dataset (published in SIR XXXX) and the data included in this Data Release are intended to inform water managers of the effect of groundwater demand and flow conditions on groundwater movement and interaction with surface-water for the area near and immediately upstream from the confluence of the lower Platte and Elkhorn Rivers.

This data set contains two sets of water-level contours that represent interpreted water-levels for an area between the Platte and Elkhorn Rivers upstream of their confluence. The contours are informed by surface-water and groundwater-level data collected during a synoptic water-level survey completed during a low-groundwater demand period in fall of 2016 and a synoptic water-level survey completed during a high-groundwater demand period in summer of 2017. Additional data and interpretations of this dataset (published in SIR XXXX) and the data included in this Data Release are intended to inform water managers of the effect of groundwater demand and flow conditions on groundwater movement and interaction with surface-water for the area near and immediately upstream from the confluence of the lower Platte and Elkhorn Rivers.

This arc and point data set contains streamflow-measurement sites and reaches indicating streamflow gain or loss under base-flow conditions along Republican River tributaries in Dundy and Chase Counties, Nebraska during May 19 to 20, 1975 (U.S. Geological Survey, 1976). The streamflow measurements were made to obtain data on ground-water/surface-water interaction. Flow was observed visually to be zero, was measured, or was estimated at 55 sites. Tributaries were followed upstream until the first road crossing where zero flow was encountered. For selected streams, points of zero flow upstream of the first zero flow site also were checked. Streamflow gain or loss for each stream reach was calculated by subtracting the streamflow values measured at the upstream end of the reach and values for contributing tributaries from the downstream value. The data obtained reflected base-flow conditions suitable for estimating streamflow gains and losses for stream reaches between sites. This digital data set was created by manually splitting the lines from a 1:250,000 hydrography data set (Soenksen and others, 1999) at every streamflow-measurement site. Each set of stream segments between measurement sites was assigned a unique reach number.