Science in the Colorado River Basin
Science Center Objects
The Colorado River is one of the longest rivers in the Western United States. It begins in the Rocky Mountains of Colorado and flows southwestward until it reaches Mexico where it becomes a small stream or dry riverbed. The Colorado River forms the border between southeastern Nevada and northwestern Arizona. In Nevada, Hoover Dam and Davis Dam control the flow of the river and create two reservoirs, Lake Mead and Lake Mohave. Hoover Dam and Davis Dam both generate hydroelectric power for Nevada and neighboring states.
Use of water from the Colorado River is carefully controlled by the Colorado River Compact, a 1922 agreement which specifies the allocation of water rights between Colorado, Utah, Wyoming, New Mexico, Arizona, California, and Nevada. In addition to the Colorado River Compact, several other laws, contracts, and guidelines define the "Law of the River."
The Colorado River Basin (Region 13) covers just over 2,500 square miles in southern Nevada and includes the following hydrographic areas: Dry Valley, Rose Valley, Eagle Valley, Spring Valley, patterson Valley, panaca Valley, Clover Valley, Lower Meadow Valley Wash, Kane Springs Valley, White RIver Valley, pahroc Valley, pahranagat Valley, Coyote Springs Valley, Three Lakes Valley, Las Vegas Valley, Colorado River Valley, piute Valley, Black Mountains Area, Garnet Valley, Hidden Valley, California Wash, Muddy River Springs Area, Lower Moapa Valley, Tule Desert, Virgin River Valley, Gold Butte Area, and Greasewood Area.
The Muddy River and Virgin River also are part of the Colorado River Basin.
USGS Nevada Water Science Center maintains several streamflow gages on the Colorado River.
DATA
Real-Time Streamflow :: Daily Values :: Peak-Flow :: Water Quality
ACTIVE STUDIES IN THE COLORADO RIVER BASIN
Evaluation of the Migration of Palliative Chemicals Used for Dust Abatement, Clark County, Nevada
For more information, contact Erin Orozco
The USGS Nevada Water Science Center is collaborating with the Bureau of Land Management and PolyAnalyltik Laboratory in Ontario, Canada to evaluate the potential migration of butyl acrylate vinyl acetate (dust palliative) in soil and storm runoff from areas of application in southern Nevada. There is concern regarding the exposure of the desert tortoise and other wildlife to palliative chemicals in water that may pool down gradient from areas of palliative application after rain events.
Visit the project web page: Evaluation of the Migration of Palliative Chemicals Used for Dust Abatement, Clark County, Nevada
Evaporation from Lake Mead and Lake Mohave, Lower Colorado River Basin, Nevada and Arizona
For more information, contact Michael Moreo
The Bureau of Reclamation currently operates a model that projects future Colorado River reservoir volumes and potential dam operations based on current and forecasted hydrologic conditions, and operational policies and guidelines (the 24-Month Study). Each month a water budget is developed and Colorado River reservoir volumes and releases are projected for the next 24-month period. Reservoir evaporation is a water-budget term currently used in the model that is based on poorly documented modifications to original USGS estimates that resulted from pioneering reconnaissance efforts in the 1940’s and 1950’s. The USGS Nevada Water Science Center and Reclamation are cooperating on a multi-phase study to improve 24-Month Study model projections by improving monthly estimates of evaporation from Lake Mead and Lake Mohave. The continuous data needed to compute monthly evaporation are being collected from floating-platform and land-based measurement stations located at each reservoir.
Visit the project web page: Evaporation from Lake Mead and Lake Mohave, Lower Colorado River Basin, Nevada and Arizona
For more information, contact Jon Wilson
The Black Mountain Industrial (BMI) complex, in Henderson, Nevada, has been the site of industrial chemical production since 1942. Perchlorate contaminants, from activities at BMI, have moved through the groundwater system and have been discovered in the Las Vegas Wash, prompting water resource investigations and groundwater treatment by the Nevada Division of Environmental Protection (NDEP). The USGS Nevada Water Science Center is assisting NDEP's efforts by providing additional surface-water discharge data that are evaluated to better understand the spatial extent, timing, and hydraulics controlling groundwater/surface-water interactions along the Las Vegas Wash.
Visit the project web page: Measurements of Stream Discharge and Analysis of Surface Water/Groundwater Interactions in Las Vegas Wash, Las Vegas, NV
For more information, contact Michael Moreo
Stump Spring has been designated as an Area of Critical Environmental Concern by the Bureau of Land Management (BLM), and Hiko Springs currently is in the designation process. Both springs flow intermittently in drainages where the depth to groundwater is shallow. The shallow groundwater flowing to and from the springs sustain scarce desert riparian habitats. BLM has recognized a need for accurate estimates of groundwater discharge by evapotranspiration (GWET) from these riparian spring-discharge areas. The USGS NVWSC is providing GWET estimates for the BLM.
Visit the project web page: Groundwater Discharge by Evapotranspiration from Areas of Spring-Fed Riparian Vegetation, Stump Spring and Hiko Springs, Nev.
Monitoring Hydrogeologic Conditions in the Regional Carbonate Aquifer, Clark County, Nevada
For more information, contact Jon Wilson
The USGS Nevada Water Science Center is evaluating and enhancing our current understanding of the hydrologic condition of the regional groundwater flow system in Clark County, Nevada. In order to achieve this objective, monitoring wells were installed in consolidated bedrock in six select regions throughout Clark County. Water-level, elevation, and borehole geophysical data were synthesized and used to develop a regional potentiometric map to improve the current understanding of regional groundwater flow within Clark County. Analyses of site specific information relating to flow across structural boundaries, groundwater and surface-water interactions, and chemical condition of waters from drilled wells were also conducted. This information will assist Federal resource managers in making informed decisions about maintaining and protecting groundwater resources within Clark County.
Visit the project web page: Monitoring Hydrogeologic Conditions in the Regional Carbonate Aquifer, Clark County, Nevada
Water Quality of Springs in the Spring Mountains
For more information, contact Sara Gedo
The USGS Nevada Water Science Center, in cooperation with the Bureau of Land Management, is sampling and analyzing water from Grapevine, Kiup, and Rainbow Springs to determine the source of water to these springs. These Springs, located in the Spring Mountains in southern Nevada, provide habitat for endangered spring snail species including the southeast Nevada Pyrg (Pyrgulopsis turbatrix) and the Spring Mountains Pyrg (Pyrgulopsis deacon).
Visit the project web page: Water Quality of Springs in the Spring Mountains
RECENTLY COMPLETED STUDIES IN THE COLORADO RIVER BASIN
Not all completed studies are listed here. If you would like additional information about completed studies, please email the NVWSC at GS-W-NVpublic-info@ usgs.gov.
Delineation of Vegetation Using Satellite Imagery, Clark County
For more information, contact Nancy Damar
In 2006, USGS, in cooperation with the Bureau of Land Management (BLM), began a 4-year study of the Red Rock Canyon National Conservation Area (NCA) to produce a land-cover data set from DigitalGlobe’s QuickBird high-resolution (2.4-meter) satellite imagery and field vegetation data. In 2010, the study was extended to include the Clark County portion of Mormon Mesa, and Coyote Springs and Piute-Eldorado Valley Areas of Critical Environmental Concern (ACEC).
Visit the project web page: Delineation of Vegetation Using Satellite Imagery, Clark County
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Date published: June 27, 2017Status: ActiveMeasurements of Stream Discharge and Analysis of Surface Water/Groundwater Interactions in Las Vegas Wash, Las Vegas, NV
The Black Mountain Industrial (BMI) complex, in Henderson, Nevada, has been the site of industrial chemical production since 1942. Perchlorate contaminants, from activities at BMI, have moved through the groundwater system and have been discovered in the Las Vegas Wash, prompting water resource investigations and groundwater treatment by the Nevada Division of Environmental Protection (NDEP)....
Contacts: Jon WilsonAttribution: States and Territories, Nevada Water Science Center -
Date published: June 2, 2017Status: ActiveGroundwater Discharge by Evapotranspiration from Areas of Spring-Fed Riparian Vegetation, Stump Spring and Hiko Springs, Nev.
Stump Spring has been designated as an Area of Critical Environmental Concern by the Bureau of Land Management (BLM), and Hiko Springs currently is in the designation process. Both springs flow intermittently in drainages where the depth to groundwater is shallow. The shallow groundwater flowing to and from the springs sustain scarce desert riparian habitats. BLM has recognized a need for...
Contacts: Michael MoreoAttribution: States and Territories, Nevada Water Science Center -
Date published: May 26, 2017Status: ActiveEvaporation from Lake Mead and Lake Mohave, Lower Colorado River Basin, Nevada and Arizona
The Bureau of Reclamation currently operates a model that projects future Colorado River reservoir volumes and potential dam operations based on current and forecasted hydrologic conditions, and operational policies and guidelines (the 24-Month Study). Each month a water budget is developed and Colorado River reservoir...
Contacts: Michael MoreoAttribution: States and Territories, Nevada Water Science Center -
Date published: April 20, 2017Status: ActiveMonitoring Hydrogeologic Conditions in the Regional Carbonate Aquifer, Clark County, Nevada
The USGS Nevada Water Science Center is evaluating and enhancing our current understanding of the hydrologic condition of the regional groundwater flow system in Clark County, Nevada. In order to achieve this objective, monitoring wells were installed in consolidated bedrock in six select regions throughout Clark County. Water-level, elevation, and borehole geophysical data were synthesized...
Contacts: Jon WilsonAttribution: Nevada Water Science Center -
Date published: April 19, 2017Status: ActiveWater Quality of Springs in the Spring Mountains
The USGS Nevada Water Science Center, in cooperation with the Bureau of Land Management, is sampling and analyzing water from Grapevine, Kiup, and Rainbow Springs to determine the source of water to these springs. These Springs, located in the Spring Mountains in southern Nevada, provide habitat for endangered spring snail species including the southeast Nevada Pyrg (Pyrgulopsis turbatrix) and...
Contacts: Sara GedoAttribution: Nevada Water Science Center -
Date published: April 5, 2017Status: CompletedDelineation of Vegetation Using Satellite Imagery, Clark County
In 2006, USGS, in cooperation with the Bureau of Land Management (BLM), began a 4-year study of the Red Rock Canyon National Conservation Area (NCA) to produce a land-cover data set from DigitalGlobe’s QuickBird high-resolution (2.4-meter) satellite imagery and field vegetation data. In 2010, the study was extended to include the Clark County portion of Mormon Mesa, and Coyote Springs and...
Contacts: Nancy DamarAttribution: Nevada Water Science Center -
Date published: March 27, 2017Status: ActiveEvaluation of the Migration of Palliative Chemicals Used for Dust Abatement, Clark County, Nevada
The USGS Nevada Water Science Center is collaborating with the Bureau of Land Management and PolyAnalyltik Laboratory in Ontario, Canada to evaluate the potential migration of butyl acrylate vinyl acetate (dust palliative) in soil and storm runoff from areas of application in southern Nevada. There is concern regarding the exposure of the desert tortoise and other wildlife to palliative...
Contacts: Erin Orozco, Angela PaulAttribution: States and Territories, Nevada Water Science Center
Association between degradation of pharmaceuticals and endocrine-disrupting compounds and microbial communities along a treated wastewater effluent gradient in Lake Mead
The role of microbial communities in the degradation of trace organic contaminants in the environment is little understood. In this study, the biotransformation potential of 27 pharmaceuticals and endocrine-disrupting compounds was examined in parallel with a characterization of the native microbial community in water samples from four sites...
Blunt, Susanna M.; Sackett, Joshua D.; Rosen, Michael R.; Benotti, Mark J.; Trenholm, Rebecca A.; Vanderford, Brett J.; Hedlund, Brian P.; Moser, Duane P.
Hydrogeology and sources of water to select springs in Black Canyon, south of Hoover Dam, Lake Mead National Recreation Area, Nevada and Arizona
Springs in Black Canyon of the Colorado River, directly south of Hoover Dam in the Lake Mead National Recreation Area, Nevada and Arizona, are important hydrologic features that support a unique riparian ecosystem including habitat for endangered species. Rapid population growth in areas near and surrounding Black Canyon has caused concern among...
Moran, Michael J.; Wilson, Jon W.; Beard, L. Sue Novel associations between contaminant body burdens and biomarkers of reproductive condition in male Common Carp along multiple gradients of contaminant exposure in Lake Mead National Recreation Area, USA
Adult male Common Carp were sampled in 2007/08 over a full reproductive cycle at Lake Mead National Recreation Area. Sites sampled included a stream dominated by treated wastewater effluent, a lake basin receiving the streamflow, an upstream lake basin (reference), and a site below Hoover Dam. Individual body burdens for 252 contaminants were...
Patino, Reynaldo; VanLandeghem, Matthew M.; Goodbred, Steven L.; Orsak, Erik; Jenkins, Jill A.; Echols, Kathy R.; Rosen, Michael R.; Torres, Leticia Are endocrine and reproductive biomarkers altered in contaminant-exposed wild male Largemouth Bass (Micropterus salmoides) of Lake Mead, Nevada/Arizona, USA?
Male Largemouth Bass were sampled from two locations in Lake Mead (USA), a site influenced by treated municipal wastewater effluent and urban runoff (Las Vegas Bay), and a reference site (Overton Arm). Samples were collected in summer (July '07) and spring (March '08) to assess general health, endocrine and reproductive biomarkers, and compare...
Goodbred, Steven L.; Patino, Reynaldo; Torres, Leticia; Echols, Kathy R.; Jenkins, Jill A.; Rosen, Michael R.; Orsak, Erik Effects of rapid urbanization on streamflow, erosion, and sedimentation in a desert stream in the American Southwest
Rapid urbanization has resulted in a series of sequential effects on a desert stream in the American Southwest. Lower Las Vegas Wash was a dry wash characterized by infrequent flood deposition when Las Vegas, Nevada was established in 1905. Wastewater effluent was discharged into the wash in low volumes for over 3 decades. Wastewater volumes...
Whitney, John W.; Glancy, Patrick A.; Buckingham , Susan E.; Ehrenberg, Arthur C.
Lake Mead--clear and vital
“Lake Mead – Clear and Vital” is a 13 minute documentary relating the crucial role of science in maintaining high water quality in Lake Mead. The program was produced coincident with release of the Lakes Mead and Mohave Circular a USGS publication covering past and on-going research in the lakes and tributaries of the Lake Mead National Recreation...
Wessells, Stephen M.; Rosen, Michael
A synthesis of aquatic science for management of Lakes Mead and Mohave
Lakes Mead and Mohave, which are the centerpieces of Lake Mead National Recreation Area, provide many significant benefits that have made the modern development of the Southwestern United States possible. Lake Mead is the largest reservoir by volume in the nation and it supplies critical storage of water supplies for more than 25 million people in...
Rosen, Michael R.; Turner, Kent; Goodbred, Steven L.; Miller, Jennell M. Bottom sediment as a source of organic contaminants in Lake Mead, Nevada, USA
Treated wastewater effluent from Las Vegas, Nevada and surrounding communities' flow through Las Vegas Wash (LVW) into the Lake Mead National Recreational Area at Las Vegas Bay (LVB). Lake sediment is a likely sink for many hydrophobic synthetic organic compounds (SOCs); however, partitioning between the sediment and the overlying water could...
Alvarez, David A.; Rosen, Michael R.; Perkins, Stephanie D.; Cranor, Walter L.; Schroeder, Vickie L.; Jones-Lepp, Tammy L.
Evaluating lake stratification and temporal trends by using near-continuous water-quality data from automated profiling systems for water years 2005-09, Lake Mead, Arizona and Nevada
The U.S. Geological Survey, in cooperation with the National Park Service and Southern Nevada Water Authority, collected near-continuous depth-dependent water-quality data at Lake Mead, Arizona and Nevada, as part of a multi-agency monitoring network maintained to provide resource managers with basic data and to gain a better understanding of the...
Veley, Ronald J.; Moran, Michael J. Patterns of metal composition and biological condition and their association in male common carp across an environmental contaminant gradient in Lake Mead National Recreation Area, Nevada and Arizona, USA
There is a contaminant gradient in Lake Mead National Recreation Area (LMNRA) that is partly driven by municipal and industrial runoff and wastewater inputs via Las Vegas Wash (LVW). Adult male common carp (Cyprinus carpio; 10 fish/site) were collected from LVW, Las Vegas Bay (receiving LVW flow), Overton Arm (OA, upstream reference), and Willow...
Patino, R.; Rosen, Michael R.; Orsak, E.L.; Goodbred, S.L.; May, T.W.; Alvarez, David; Echols, K.R.; Wieser, C.M.; Ruessler, S.; Torres, L. Importance of benthic production to fish populations in Lake Mead prior to the establishment of quagga mussels
Limnologists recently have developed an interest in quantifying benthic resource contributions to higher-level consumers. Much of this research focuses on natural lakes with very little research in reservoirs. In this study, we provide a contemporary snapshot of the food web structure of Lake Mead to evaluate the contribution of benthic resources...
Umek, John; Chandra, Sudeep; Rosen, Michael; Wittmann, Marion; Sullivan, Joe; Orsak, Erik Assessment of multiple sources of anthropogenic and natural chemical inputs to a morphologically complex basin, Lake Mead, USA
Lakes with complex morphologies and with different geologic and land-use characteristics in their sub-watersheds could have large differences in natural and anthropogenic chemical inputs to sub-basins in the lake. Lake Mead in southern Nevada and northern Arizona, USA, is one such lake. To assess variations in chemical histories from 1935 to 1998...
Rosen, Michael R.; Van Metre, P.C.-
Date published: October 22, 2015Evaporation data from Lake Mead and Lake Mohave, Nevada and Arizona, March 2010 through April 2015
Evaporation data from Lake Mead and Lake Mohave. USGS and Bureau of Reclamation are cooperating on a multi-phase study to improve 24-Month Study model projections by improving monthly estimates of evaporation from Lake Mead and Lake Mohave.
Attribution: Nevada Water Science Center