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Nebraska Water Science Center delivers real-time water data for Nebraska streams and aquifers to cooperators and the public. We operate flood alert systems for the Lincoln and Omaha metro areas and create flood inundation maps for partner cities. Our expertise includes groundwater studies and models, water quality, geomorphology, and ecology; allowing for integrated water research in the State.

Link to Science Center

News

Date published: March 21, 2019

Media Advisory: USGS Measures Record Flooding Across Nebraska

Reporters: Do you want to accompany a USGS field crew as they measure flood impacts? Please contact Marisa Lubeck or Jason Lambrecht to coordinate.

Date published: February 27, 2018

Reservoir Sediment Can be Used as Fracking Proppant

Instead of requiring costly dredging to remove sediment buildup behind water reservoirs and diversions, sediment from reservoirs in the Missouri River Basin could actually be used as fracking proppant feedstock, also known as frac sand, according to a recently published U.S. Geological Survey study

Date published: August 21, 2017

Stitching Together the New Digital Geologic Quilt of the United States

A carbonatite here, a glacial moraine there, a zig-zagging fault or two, even a behemoth of a batholith. The geology of the 50 States is an enormous patchwork of varied forms, beautiful in their variance but challenging to present as a single map.

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USGS
Date Published: June 26, 2019
Status: Active

Information by Region - Nebraska

  

Application to explore US Oil and Gas Assessments
Date Published: April 19, 2019
Status: Active

United States Assessments of Undiscovered Oil and Gas Resources

USGS Energy Resources Program provides periodic assessments of the oil and natural gas endowment of the United States and the World (click here for information about World Oil and Gas Assessments).  This website provides access to new, prioritized, assessment results and supporting data for the United States, as part...

June 2011 Mississippi River flood
Date Published: February 25, 2019
Status: Completed

Summer 2011 Missouri River Basin flood

Learn more about USGS flood activities related to the 2011 Missouri River Basin Flood resulting from higher-than-average snowmelt runoff combined with heavy spring rains.

Nemaha Uplift Province 5055 National Oil and Gas Assessment
Date Published: December 7, 2018
Status: Active

Nemaha Uplift Province Oil and Gas Assessment

The U.S. Geological Survey completed the following assessments of undiscovered oil and gas potential of the Nemaha Uplift Province (5055):

 

Province 5056 Forest City Basin Oil and Gas Assessment
Date Published: December 7, 2018
Status: Archived

Forest City Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of undiscovered oil and gas potential of the Forest City Basin Province (5056):

 

Cambridge Arch-Central Kansas Uplift (5053) National Oil and Gas Assessment
Date Published: December 7, 2018
Status: Active

Cambridge Arch-Central Kansas Uplift Oil and Gas Assessment

The U.S. Geological Survey completed the following assessments of undiscovered oil and gas potential of the Cambridge Arch/Central Kansas Uplift Province (5053):

 

Province 5039 Denver Basin National Oil and Gas Assessments
Date Published: November 29, 2018
Status: Active

Denver Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of undiscovered oil and gas resources of the Denver Basin Province 5039 in Colorado, Kansas, Nebraska, South Dakota, and Wyoming:

  • 2003 Conventional and Continuous Assessment (DDS 69-P)
  • 1995 Assessment (
  • ...
Canoe coring platform in Potomac River
Date Published: November 28, 2018
Status: Active

Natural Drought and Flood Histories from Lacustrine Archives

Previous work performed as part of the USGS Holocene Synthesis project illuminated complex centennial-scale patterns of drought and wetter-than-average conditions across the North American continent interior during the past two millennia, where paleorecord data coverage is sparse.  In order to explain the patterns of naturally-occurring drought, floods, and storms for the past, identified by...

Photo of Bird Bands in a Variety of Sizes and Types
Date Published: May 1, 2018
Status: Active

Bird Banding Laboratory

The Bird Banding Laboratory (BBL) is an integrated scientific program established in 1920 supporting the collection, archiving, management and dissemination of information from banded and marked birds in North America.  This information is used to monitor the status and trends of resident and migratory bird populations. Because birds are good indicators of the health of the environment, the...

Energy - Bakken
Date Published: March 8, 2018

Mining and Energy

Scientists are examining a number of issues to characterize potential effects of unconventional oil and gas development in the Bakken Shale within the Williston Basin, located in ND, SD and MT. Research is building upon current/ongoing studies to implement new, innovative research including water quality, water availability, ecological effects, proppant sand, and induced seismicity.

Attribution: Midcontinent
Flood Scientists - Drayton
Date Published: March 8, 2018

Flood Response

Floods are the leading cause of natural disaster losses, and Midwest Region scientists are ready to respond. Flood inundation maps tied to USGS real-time stream gage data and National Weather Service flood forecast sites enable state and local communities to make timely operational and public safety decisions during floods.

USGS well near the confluence of the Elkhorn and Lower Platte Rivers
Date Published: February 27, 2017

Groundwater/surface-water interaction near the confluence of the Elkhorn and Lower Platte Rivers

Recent droughts in Nebraska (2000–06; 2012–13) have amplified concerns about the long-term sustainability of groundwater and surface-water resources as well as concerns about the effect of groundwater irrigation on streamflow and water supplies needed to meet wildlife, recreational, and municipal needs.  The Lower Platte River Basin-wide Management Plan is currently being developed jointly by...

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USGS
September 26, 2019

Groundwater age distribution and susceptibility to natural and anthropogenic contaminants were assessed for selected principal aquifers of the Western United States: the Central Valley aquifer system (CVAL), the Basin and Range basin-fill aquifers (BNRF), the Rio Grande aquifer system (RIOG), the High Plains aquifer (HPAQ), the Columbia Plateau basaltic-rock aquifers (CLPT), and the Colorado Plat

NWIS Mapper screenshot
March 5, 2019

The NWIS mapper provides access to over 1.5 million sites contained in the USGS National Water Information System (NWIS), including sites where current and historical surface-water, groundwater, springs, and atmospheric data has been collected. Users can search by site type, data type, site number, or place.

Image of data download web page
December 6, 2018

GIS Data for Forest City Basin Oil and Gas Assessments

Image of data download web page
December 6, 2018

GIS Data for Cambridge Arch-Central Kansas Uplift Oil and Gas Assessments 

Image of data download web page
December 6, 2018

GIS Data for Nemaha Uplift Oil and Gas Assessments

Interactive map and chart highlighting USGS Domestic Continuous (Unconventional) Oil & Gas Assessments, 2000-Present
August 28, 2018

Interactively explore assessment summary information for continuous (unconventional) assessments conducted at the USGS from 2000-2018. The assessment results data used to generate this visualization can be downloaded here in Excel Format.  These data represent all assessment results for Continuous Assessments only from 2000-2018.

Application screenshot thumbnail
September 1, 2017

The National Water Information System (NWIS) web application provides access to real-time and historical surface-water, groundwater, water-quality, and water-use data collected at approximately 1.5 million sites across all 50 states.

USGS
April 1, 2017

Mineral groups identified through automated analysis of remote sensing data acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) were used to generate a map showing the type and spatial distribution of hydrothermal alteration, other exposed mineral groups, and green vegetation across the northwestern conterminous United States. Boolean algebra was used to combine

Screen shot of Nebraska Natural Resources District wells on Groundwater Watch
February 28, 2017

Groundwater well networks for Natural Resources Districts in Nebraska. Real-time, continuous, and periodic data are available.

Screen shot of Nebraska Real-Time Water Quality map
December 5, 2016

Real-time computed concentrations of water-quality constituents such as suspended sediment, total nitrogen, and total phosphorus are calculated using ordinary least squares regression models. The results of these models, along with direct water-quality measurements, can be viewed here as time-series graphs, or downloaded as tabular data.

USGS
August 4, 2016

These data are part of a larger USGS project to develop an updated geospatial database of mines, mineral deposits and mineral regions in the United States. Mine and prospect-related symbols, such as those used to represent prospect pits, mines, adits, dumps, tailings, etc., hereafter referred to as “mine” symbols or features, are currently being digitized on a state-by-state basis fro

Structure datasets for the nation from The National Map
April 20, 2016

USGS data portray selected structures data, including the location and characteristics of manmade facilities. Characteristics consist of a structure's physical form (footprint), function, name, location, and detailed information about the structure. The types of structures collected are largely determined by the needs of the disaster planning and response and homeland security organizations.

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Application to explore US Oil and Gas Assessments
March 19, 2019

This map shows the provinces assessed by the USGS for undiscovered oil and gas resources. 

Digital Elevation Model in the Atchafalaya Basin, LA
April 19, 2016

The 3DEP products and services available through The National Map consist of standard digital elevation models (DEMs) at various horizontal resolutions, elevation source and associated datasets, an elevation point query service and bulk point query service. All 3DEP products are available, free of charge and without use restrictions.

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Publication Thumbnail
Year Published: 2015

A random-walk algorithm for modeling lithospheric density and the role of body forces in the evolution of the Midcontinent Rift

This paper develops a Monte Carlo algorithm for extracting three-dimensional lithospheric density models from geophysical data. Empirical scaling relationships between velocity and density create a 3D starting density model, which is then iteratively refined until it reproduces observed gravity and topography. This approach permits deviations from...

Levandowski, William Brower; Boyd, Oliver S.; Briggs, Richard W.; Gold, Ryan D.
Levandowski, W., Boyd, O., Briggs, R. and Gold, R. (2015), A random-walk algorithm for modeling lithospheric density and the role of body forces in the evolution of the Midcontinent Rift. Geochem. Geophys. Geosyst.. Accepted Author Manuscript. doi:10.1002/2015GC005961

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Year Published: 2015

Flood-inundation maps for the St. Marys River at Decatur, Indiana

Digital flood-inundation maps for an 8.9-mile reach of the St. Marys River at Decatur, Indiana, were developed by the U.S. Geological Survey (USGS), in cooperation with the Indiana Office of Community and Rural Affairs. The inundation maps, which can be accessed through the USGS Flood Inundation Mapping Science Web site (http://water.usgs.gov/osw/...

Strauch, Kellan R.
Strauch, K.R., 2015, Flood-inundation maps for the St. Marys River at Decatur, Indiana: U.S. Geological Survey Scientific Investigations Report 2015–5099, 8 p., http://dx.doi.org/10.3133/sir20155099.

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Year Published: 2014

Hydrostratigraphic interpretation of test-hole and borehole geophysical data, Kimball, Cheyenne, and Deuel Counties, Nebraska, 2011-12

Recently (2004) adopted legislation in Nebraska requires a sustainable balance between long-term supplies and uses of surface-water and groundwater and requires Natural Resources Districts to understand the effect of groundwater use on surface-water systems when developing a groundwater-management plan. The South Platte Natural Resources District...

Hobza, Christopher M.; Sibray, Steven S.
Hydrostratigraphic interpretation of test-hole and borehole geophysical data, Kimball, Cheyenne, and Deuel Counties, Nebraska, 2011-12; 2014; OFR; 2014-1103; Hobza, Christopher M.; Sibray, Steven S.

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Year Published: 2012

Diversity and distribution of mayflies (Ephemeroptera), stoneflies (Plecoptera), and caddisflies (Trichoptera) of the South Platte River Basin, Colorado, Nebraska, and Wyoming, 1873-2010

The U.S. Geological Survey, in cooperation with the C.P. Gillette Museum of Arthropod Diversity (Colorado State University, Fort Collins, Colorado), compiled collection record data to document the historical and present-day occurrence of mayfly, stonefly, and caddisfly species in the South Platte River Basin. Data were compiled from records...

Zuellig, Robert E.; Heinold, Brian D.; Kondratieff, Boris C.; Ruiter, David E.
Diversity and distribution of mayflies (Ephemeroptera), stoneflies (Plecoptera), and caddisflies (Trichoptera) of the South Platte River Basin, Colorado, Nebraska, and Wyoming, 1873-2010; 2012; DS; 606; Zuellig, Robert E.; Heinold, Brian D.; Kondratieff, Boris C.; Ruiter, David E.

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Year Published: 2011

Agricultural herbicide transport in a first-order intermittent stream, Nebraska, USA

The behavior of herbicides in surface waters is a function of many variables, including scale of the watershed, physical and chemical properties of the herbicide, physical and chemical properties of the soil, rainfall intensity, and time of year. In this study, the transport of 6 herbicides and 12 herbicide degradates was examined during the 2004...

Vogel, J.R.; Linard, J.I.
Agricultural herbicide transport in a first-order intermittent stream, Nebraska, USA; 2011; Article; Journal; Applied Engineering in Agriculture; Vogel, J. R.; Linard, J. I.

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Year Published: 2010

Digital map of aquifer boundary for the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming

This digital data set represents the extent of the High Plains aquifer in the central United States. The extent of the High Plains aquifer covers 174,000 square miles in eight states: Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming. This data set represents a compilation of information from digital and paper...

Qi, Sharon
Digital map of aquifer boundary for the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming; 2010; DS; 543; Qi, Sharon

Publication Thumbnail
Year Published: 2008

Decadal-scale changes of nitrate in ground water of the United States, 1988-2004

This study evaluated decadal-scale changes of nitrate concentrations in groundwater samples collected by the USGS National Water-Quality Assessment Program from 495 wells in 24 well networks across the USA in predominantly agricultural areas. Each well network was sampled once during 1988-1995 and resampled once during 2000-2004. Statistical tests...

Rupert, Michael G.
Decadal-scale changes of nitrate in ground water of the United States, 1988-2004; 2008; Conference Paper; Journal of Environmental Quality; Rupert, M. G.

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Year Published: 2008

Near-decadal changes in nitrate and pesticide concentrations in the South Platte River alluvial aquifer, 1993-2004

The lower South Platte River basin of Colorado and Nebraska is an area of intense agriculture supported by surface-water diversions from the river and ground-water pumping from a valley-fill alluvial aquifer. Two well networks consisting of 45 wells installed in the South Platte alluvial aquifer were sampled in the early 1990s and again in the...

Paschke, S.S.; Schaffrath, K.R.; Mashbum, S.L.
Near-decadal changes in nitrate and pesticide concentrations in the South Platte River alluvial aquifer, 1993-2004; 2008; Conference Paper; Journal of Environmental Quality; Paschke, S. S.; Schaffrath, K. R.; Mashbum, S. L.

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Year Published: 2007

Nutrient and Suspended-Sediment Trends in the Missouri River Basin, 1993-2003

Trends in streamflow and concentration of total nitrogen, nitrite plus nitrate, ammonia, total phosphorus, orthophosphorus, and suspended sediment were determined for the period from 1993 to 2003 at selected stream sites in the Missouri River Basin. Flow-adjusted trends in concentration (the trends that would have occurred in the absence of...

Sprague, Lori A.; Clark, Melanie L.; Rus, David L.; Zelt, Ronald B.; Flynn, Jennifer L.; Davis, Jerri V.
Nutrient and Suspended-Sediment Trends in the Missouri River Basin, 1993-2003; 2007; SIR; 2006-5231; Sprague, Lori A.; Clark, Melanie L.; Rus, David L.; Zelt, Ronald B.; Flynn, Jennifer L.; Davis, Jerri V.

Publication Thumbnail
Year Published: 2001

Historical water-quality data for the High Plains Regional Ground-Water Study Area in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1930-98

The High Plains aquifer underlies 174,000 square miles in parts of eight States and includes eight primary hydrogeologic units, including the well-known Ogallala Formation. The High Plains aquifer is an important resource, providing water for 27 percent of the Nation?s irrigated agricultural lands in an otherwise dry landscape. Since the 1980?s...

Litke, David W.
Historical water-quality data for the High Plains Regional Ground-Water Study Area in Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1930-98; 2001; WRI; 2000-4254; Litke, David W.

Publication Thumbnail
Year Published: 1997

Organochlorine compounds and trace elements in streambed sediment and fish tissue, South Platte River Basin; Colorado, Nebraska, and Wyoming

Concentration data for organochlorine compounds and trace elements in streambed sediment and fish tissue collected throughout the South Platte River Basin as part of the U.S. Geological Survey's National WaterQuality Assessment (NAWQA) Program were evaluated to determine the following: (1) which organochlorine compounds and trace elements occurred...

Heiny, Janet S.
Organochlorine compounds and trace elements in streambed sediment and fish tissue, South Platte River Basin; Colorado, Nebraska, and Wyoming; 1997; FS; 040-97; Heiny, Janet S.

Publication Thumbnail
Year Published: 1990

National water summary 1987: Hydrologic events and water supply and use

Water use in the United States, as measured by freshwater withdrawals in 1985, averaged 338,000 Mgal/d (million gallons per day), which is enough water to cover the 48 conterminous States to a depth of about 2.4 inches. Only 92,300 Mgal/d, or 27.3 percent of the water withdrawn, was consumptive use and thus lost to immediate further use; the...

Carr, Jerry E.; Chase, Edith B.; Paulson, Richard W.; Moody, David W.
Attribution: Water, Central Midwest Water Science Center, Dakota Water Science Center, , , Kansas Water Science Center, Minnesota Water Science Center, Pennsylvania Water Science Center, Texas Water Science Center, Utah Water Science Center, , Upper Midwest Environmental Sciences Center, Upper Midwest Water Science Center, Water Resources, Water Availability and Use Science Program, Midcontinent, Southeast, Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, U.S. Virgin Islands, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, United States of America
National water summary 1987: hydrologic events and water supply and use; 1990; WSP; 2350; Carr, Jerry E.; Chase, Edith B.; Paulson, Richard W.; Moody, David W.

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USGS hydrologists conducts water quality sampling from a bridge during flooding
March 31, 2019

Spring 2019 Flooding - Louisville, NE

After record flooding in the Midwest, USGS crews mobilized to take important water measurements.

Image from an application that navigates users through USGS National Oil and Gas Assessment Provinces
November 14, 2018

National Oil and Gas Assessment Provinces

This is a graphic from the USGS National Oil and Gas Assessment Explorer application, which allows user to drill into 70 oil and gas assessment provinces throughout the United States.

August 21, 2018

Image of the Week - One Year Ago: Eclipse Darkens Nebraska

A total solar eclipse darkened the skies over the United States on Aug. 21, 2017.

Fourteen states were in the path of totality, a 70-mile-wide band under which the moon fully blocked the sun for just under three minutes.

Oshkosh, a town in the Nebraska Sandhills was a prime location for viewing the eclipse. This Landsat 7 image shows the town at 11:33 a.m.

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Satellite image showing the eclipse.
August 21, 2018

One Year Ago: Total Eclipse Darkens Nebraska Sandhills

A total solar eclipse darkened the skies over the United States on Aug. 21, 2017.

Oshkosh, a town in the Nebraska Sandhills, was a prime location for viewing the eclipse. This Landsat 7 image shows the town at 11:33 a.m. local time on Aug. 18, 2016, a year before the total eclipse.

Ice jam at Ponca Creek at Verdel, NE, February 15, 2017
February 15, 2017

Ice jam at Ponca Creek at Verdel, NE, February 15, 2017

USGS Nebraska Water Science Center hydrologic technician, Nathan Shultz, collecting depth and velocity data at the USGS streamgaging station 06453600 Ponca Creek at Verdel, Nebraska during an ice jam on February 15, 2017. 

Hydrologic technician making an ice-affected stream discharge measurement.
January 19, 2017

Ice-affected stream discharge measurement.

Hydrologic Technician, James Albrecht, from the North Platte Field Office making a measurement of discharge under ice using a Flowtracker acoustic velocity meter on a top-setting wading rod.  The string going across the picture is a tagline, used for measuring distance across the channel so that he can note the location of the ice hole he is working in.  Typically, the

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Image: Memorial Stadium, University of Nebraska Cornhuskers
March 14, 2016

Memorial Stadium, University of Nebraska Cornhuskers

This image is a High Resolution Orthoimagery, 6-inch spatial resolution, Lancaster County Dataset, taken in April 2007. High Resolution Orthoimagery looks like a photograph but any distortions caused by the tilt of the camera or topography of the land have been removed, so orthoimages are geospatially accurate and can be used as maps.

Visit the

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Image: Flooding in Nebraska
September 30, 2014

Flooding in Nebraska

Jet ski in fotsam at Salt Creek at Greenwood, NE.

Agricultural tile drain emptying into waterway.
September 28, 2014

Agricultural tile drain emptying into waterway.

Agricultural tile drain emptying into waterway.

Instrumented tile drain at edge of field.
September 26, 2014

Tile drain in eastern Nebraska equipped with monitoring instruments.

Tile drain in eastern Nebraska equipped with monitoring instruments.

A storm on the horizon of a grassy meadow in western Nebraska.
December 31, 2013

A storm on the horizon of a grassy meadow.

A storm on the horizon of a grassy meadow in western Nebraska. 

August 27, 2013

Water-level Change in the High Plains Aquifer System

In 1986, Congress directed the USGS to regularly report groundwater-level changes in the High Plains aquifer system. To comply with this directive, the USGS compares water levels measured every two years. By measuring water levels across the entire aquifer in one year, measurements made two years later enable calculation of changes over time. Measured water levels from

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Image: Flooding in Nebraska
March 21, 2019

Reporters: Do you want to accompany a USGS field crew as they measure flood impacts? Please contact Marisa Lubeck or Jason Lambrecht to coordinate.

Image: Brown Fracking Sand
February 27, 2018

Instead of requiring costly dredging to remove sediment buildup behind water reservoirs and diversions, sediment from reservoirs in the Missouri River Basin could actually be used as fracking proppant feedstock, also known as frac sand, according to a recently published U.S. Geological Survey study

Image shows a geologic map of the Lower 48
August 21, 2017

A carbonatite here, a glacial moraine there, a zig-zagging fault or two, even a behemoth of a batholith. The geology of the 50 States is an enormous patchwork of varied forms, beautiful in their variance but challenging to present as a single map.

Flooding on the south Loup River at Arnold, Nebr.
August 18, 2017

Recent storms in north-central and northeast Nebraska have caused high flows in several rivers, streams and creeks. 

High Plains aquifer water-level changes, predevelopment to 2015
June 16, 2017

The U.S. Geological Survey has released a new report detailing changes of groundwater levels in the High Plains aquifer. The report presents water-level change data in the aquifer for two separate periods: from 1950 – the time prior to significant groundwater irrigation development – to 2015, and from 2013 to 2015.

USGS
February 17, 2017

Small variations in the density of the earth’s crust—undetectable to humans without sensitive instruments—influence where earthquakes may occur in the central United States. These new findings from the U.S. Geological Survey, published today in Nature Communications, may allow scientists to map where future seismicity in the center of the country is most likely.

USGS: Science for a changing world
February 13, 2017

Water-level changes from 2002 to 2015 were examined in wells screened in the High Plains aquifer within the Republican River Basin and the results are now available in a new U.S. Geological Survey Scientific Investigations Map.

Map of Northern High Plains Aquifer
December 13, 2016

A new U.S. Geological Survey publication and model can be applied by multiple entities to better understand flow, quantity, sources and sinks of groundwater in the Northern High Plains Aquifer, which covers approximately 100,000 square miles across Nebraska, South Dakota, Kansas, Colorado and Wyoming.

Unmanned Aerial Vehicle Ignites Controlled Fires
July 31, 2016

The USGS Nebraska Cooperative Fish and Wildlife Research Unit in partnership with the Nebraska Intelligent MoBile Unmanned Systems Lab (NIMBUS) and the Applied Complex Adaptive Systems Lab have designed a drone prototype that drops balls filled with combustible material that ignites fire as part of prescribed fire management.

Map of the 48 contiguous states showing Microcystin concentrations
May 31, 2016

First-of-its-kind survey shows that algal toxins are found nationwide

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