Unified Interior Regions

Region 7: Upper Colorado Basin

Map of Region 7: Upper Colorado Basin

Map of Region 7:  Upper Colorado Basin

Map Showing USGS/DOI Unified Region 7 and parts of adjoining Regions

Regions L2 Landing Page Tabs

USGS Science Centers in Region 7-Upper Colorado Basin conduct a large number of cooperative and collaborative projects with other agencies and partners. A sampling of those projects are shown below on this web page.

Filter Total Items: 388
Date published: July 26, 2016
Status: Active

HDgov: Multi-agency Website for Human Dimensions of Natural Resources

HDgov is an interactive and mobile-responsive online portal to interagency, academic, and non-government resources focused on the human dimensions of natural resource management. The web portal provides easy access to tools, publications, data, and methods that help ensure that the people side of natural resources is considered throughout the entire natural resource management process. The...

Date published: July 26, 2016
Status: Active

National Park Service Visitor Spending Effects

The National Park Service (NPS) manages the Nation’s most iconic destinations that attract millions of visitors from across the Nation and around the world. Trip-related spending by NPS visitors generates and supports a considerable amount of economic activity within park gateway communities. USGS economists collaborate with the National Park Service social science program to estimate NPS...

Date published: July 21, 2016
Status: Active

Using Quantile Regression to Investigate Ecological Limiting Factors

Unexplained heterogeneity in statistical models of animal responses to their physical environment is reasonable to expect because the measured habitat resources are a constraint on—but not the sole determinant of—abundance, survival, fecundity, or fitness. The ecological understanding and reliability of management predictions based on animal habitat models can be improved by shifting focus ...

Date published: July 21, 2016
Status: Active

North American Waterfowl Management Plan

The ultimate success of North American Waterfowl Management Plan (NAWMP) depends on maintaining relevance to stakeholders and society. In order to be relevant, a first step is to better understand what people value in regard to waterfowl and their habitats. 

Date published: July 21, 2016
Status: Active

Bat Fatalities at Wind Turbines—Investigating the Causes and Consequences

Wind energy is one of the fastest-growing industries in the world and represents an important step toward reducing dependence on nonrenewable sources of power. However, widespread deployment of industrial wind turbines is having unprecedented adverse effects on certain species of bats that roost in trees and migrate. Bats are beneficial consumers of agricultural insect pests and migratory...

Date published: July 19, 2016
Status: Completed

Quantitative and Statistical Research Collaboration

Mathematical and statistical models are powerful research tools that play several important roles in conceptualizing and understanding the structure and dynamics of complicated ecological systems, including developing mechanistic hypotheses pertaining to ecological systems, designing studies that elucidate ecosystem structure and function, and extracting information from data.

Date published: July 12, 2016
Status: Active

Strategies and Tactics for the Experienced Natural Resource Negotiator

In 2021, the advanced negotiation course, "Strategies and Tactics for Experienced Natural Resource Negotiator", will not be offered.

Contacts: Nina Burkardt
Date published: July 7, 2016
Status: Active

Ecology and Control of Invasive Reptiles in Florida

This project involves ongoing development of tools for the detection and capture of invasive reptiles in Florida, with an emphasis on Burmese pythons (Python bivittatus) and Black and white tegu lizards (Salvator merianae). The goals are to reduce the risk of reptile invasions in high-value resources such as Everglades National Park and the Florida Keys, to access early detection methods of...

Date published: July 6, 2016
Status: Active

Control and Landscape-Scale Suppression of the Invasive Brown Treesnake

The Brown Treesnake is a highly destructive reptile species that has extirpated many native species of birds, bats, and lizards from the U.S. Territory of Guam. For more than two decades branch scientists with the Invasive Reptile Project have developed, validated, and tested the feasibility of Brown Treesnake control and suppression at various spatial scales.

Date published: July 5, 2016
Status: Active

Effects of Contaminants on Linked Aquatic and Terrestrial Food Webs

Most aquatic insects live in fresh water as larvae and move to land as flying adults to complete their life cycle. Although often ignored, the emergence of adults can transfer the effects of contamination from aquatic to terrestrial ecosystems as the adults are eaten by predators such as spiders, birds, and bats.

Date published: July 5, 2016
Status: Active

Bat Species of Concern: An Ecological Synthesis for Resource Managers

A large number of bat species are considered “species of concern” in the United States and its Territories, and resource managers are increasingly interested in learning more about their distribution, status, and potential management.

Date published: July 5, 2016
Status: Active

Economic Impacts of Ecological Restoration

Federal investments in ecosystem restoration projects protect Federal trusts, ensure public health and safety, and preserve and enhance essential ecosystem services. These investments also generate business activity and create jobs. However, limited information exists on the costs and associated economic impacts of ecosystem restoration projects due to the complexity of the “restoration...

USGS Science Centers in Region 7-Upper Colorado Basin collect a wide variety of natural resource data types including spatial, geologic, hydrologic, and biologic data. Data included in USGS-series publications that are not publically available in USGS databases are published in Data Releases. Tools are USGS products that can be used to analyze those types of data.

Filter Total Items: 279
Date published: January 1, 2017

Description of core collected during installation of a Wasatch aquifer monitoring well in the Green River Basin, Sublette County, Wyoming

A monitoring well was installed in the Wasatch aquifer in the Green River Basin, Sublette County, Wyoming in August 2015. Core collected during drilling activities was described to a depth of 170 feet. The data release contains a detailed description of the lithology and physical characteristics of the core sections, as well as numerous photographs. The data release was produced in complian...

Date published: January 1, 2017

Data Release for Bedrock Geology and Hydrostratigraphy of the Edwards and Trinity Aquifers within the Driftwood and Wimberley 7.5-Minute Quadrangles, Hays and Comal Counties, Texas at 1:24,000 scale

The Edwards and Trinity aquifers are major sources of water in south-central Texas and are both classified as major aquifers by the State of Texas. The population in Hays and Comal Counties is rapidly growing, increasing demands on the area's water resources. To help effectively manage the water resources in the area, refined maps and descriptions of the geologic structures and hydrostratig...

Date published: January 1, 2017

Output datasets of ecological communities (invertebrates and fish), streamflow, habitat, and water quality to examine the presence of trends in ecological communities from the Fountain Creek Basin, Colorado, USA, 2003-2016

These data were used for an analysis as part of a long-term project monitoring the biological communities, habitat, and water quality of the Fountain Creek Basin. Biology, habitat, and water quality data have been collected at 10 sites starting in 2003. These data include annual samples of aquatic invertebrate communities, fish communities, water quality, and quantitative riverine

Date published: January 1, 2017

Input datasets of ecological communities (invertebrates and fish), streamflow, habitat, and water quality to examine the presence of trends in ecological communities from the Fountain Creek Basin, Colorado, USA, 2003-2016

These data were used for an analysis as part of a long-term project monitoring the biological communities, habitat, and water quality of the Fountain Creek Basin. Biology, habitat, and water quality data have been collected at 10 sites starting in 2003. These data include annual samples of aquatic invertebrate communities, fish communities, water quality, and quantitative riverine

Date published: January 1, 2017

Datasets of ecological communities (invertebrates and fish), streamflow, habitat, and water quality to examine the presence of trends in ecological communities from the Fountain Creek Basin, Colorado, USA, 2003-2016

These data were used for an analysis as part of a long-term project monitoring the biological communities, habitat, and water quality of the Fountain Creek Basin. Biology, habitat, and water quality data have been collected at 10 sites starting in 2003. These data include annual samples of aquatic invertebrate communities, fish communities, water quality, and quantitative riverine

Date published: January 1, 2017

Boundary extent for datasets of regolith thickness, bedrock altitude, depth to water, potentiometric-surface altitude, and saturated thickness for the shallow groundwater system in the Lower Gunnison River Basin, Colorado

This dataset consists of the boundary extent used to evaluate regolith thickness, bedrock altitude, depth to water, potentiometric-surface altitude, and saturated thickness for the shallow groundwater system in the Lower Gunnison River Basin, in Delta, Montrose, Ouray, and Gunnison Counties, Colorado. The U.S. Geological Survey prepared this dataset in cooperation with the Color

Date published: January 1, 2017

Dataset of Flathead Chub abundance and important streamflow metrics from the Fountain Creek Basin, Colorado, USA, 2003-2016

These data were used for an analysis as part of a long-term project monitoring the biological communities, habitat, and water quality of the Fountain Creek Basin. Biology, habitat, and water quality data have been collected at 10 sites starting in 2003. These data include annual samples of aquatic invertebrate communities, fish communities, water quality, and quantitative riverine

Date published: January 1, 2017

New Mexico and Surrounding Basin Mean Annual Streamflow for Streamgages with Period of Records Greater than 10 Years (2017)

Data represent mean annual streamflow for streamgages throughout the state of New Mexico and for drainage basins with streams that flow into the state. Mean-annual streamflow is computed based on data from the National Water Information System (NWIS) for each year in the period of record for streamgages with periods of record in exceedance of 10 years. The dataset also contains latitude and l...

Date published: January 1, 2017

USGS Southwest Repeat Photography Collection: Kanab Creek, southern Utah and northern Arizona, 1872-2010

The USGS Southwest Repeat Photography Collection (‘Collection’), formerly named the Desert Laboratory Repeat Photography Collection, is now housed by the Southwest Biological Science Center (SBSC) in Flagstaff, Arizona. It contains images from the late 1800s to mid-2000s, and was assembled over decades by now retired USGS scientists Drs. Robert H. Webb and Raymond

Date published: January 1, 2017

Digital map of hydrothermal alteration type, key mineral groups, and green vegetation of the northwestern United States derived from automated analysis of ASTER satellite data

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

Date published: January 1, 2017

Basin Characteristics and Mean Annual Streamflow Data for Streamgages in New Mexico and Adjacent States, 2017

The U.S. Geological Survey (USGS), in cooperation with the New Mexico Water Resources Research Institute (WRRI), identified basin characteristics and estimated mean annual streamflow for a regional study of 169 USGS surface-water streamgages throughout the state of New Mexico and adjacent states. The basin characteristics and mean annual streamflows presented here will be used to deri

Date published: December 31, 2016

Transient Electromagnetic Sounding Data Collected in the San Luis Valley, Colorado near the Great Sand Dunes National Park and Preserve and the Alamosa National Wildlife Refuge (Field Seasons 2007, 2009, and 2011))

Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, and an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife

USGS Science Centers in Region 7-Upper Colorado Basin produce hundreds of USGS-series publications, journal papers, and books each year that are subject to rigorous review by USGS specialists. The publications shown below on this page are related to study areas and staff members of USGS Science Centers in Region 7 compiled from the USGS Publications Warehouse.

Filter Total Items: 5,302
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Year Published: 2020

Landscape and climatic influences on actual evapotranspiration and available water using the Operational Simplified Surface Energy Balance (SSEBop) Model in eastern Bernalillo County, New Mexico, 2015

The U.S. Geological Survey, in cooperation with the Bernalillo County Public Works Division, conducted a 1-year study in 2015 to assess the spatial and temporal distribution of evapotranspiration (ET) and available water within the East Mountain area in Bernalillo County, New Mexico. ET and available water vary spatiotemporally because of complex...

Douglas-Mankin, Kyle R.; McCutcheon, Ryan J.; Mitchell, Aurelia C.; Senay, Gabriel B.
Douglas-Mankin, K.R., McCutcheon, R.J., Mitchell, A.C., and Senay, G.B., 2020, Landscape and climatic influences on actual evapotranspiration and available water using the Operational Simplified Surface Energy Balance (SSEBop) Model in eastern Bernalillo County, New Mexico, 2015: U.S. Geological Survey Scientific Investigations Report 2020–5095, 40 p., https://doi.org/10.3133/sir20205095.

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Year Published: 2020

Baseflow age distributions and depth of active groundwater flow in a snow‐dominated mountain headwater basin

Deeper flows through bedrock in mountain watersheds could be important, but lack of data to characterize bedrock properties limits understanding. To address data scarcity, we combine a previously published integrated hydrologic model of a snow‐dominated, headwater basin of the Colorado River with a new method for dating baseflow age using...

Carroll, Rosemary W.H.; Manning, Andrew H.; Niswonger, Richard G.; Marchetti, David W; Williams, Kenneth H.

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Year Published: 2020

Generalizing the inversion‐based PSHA source model for an interconnected fault system

This article represents a step toward generalizing and simplifying the procedure for constructing an inversion‐based seismic hazard source model for an interconnected fault system, including the specification of adjustable segmentation constraints. A very simple example is used to maximize understandability and to counter the notion that an...

Field, Edward H.; Milner, Kevin R.; Page, Morgan T.

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Year Published: 2020

Alkalic-type epithermal gold deposit model; Chapter R in Mineral deposit models for resource assessment

This report summarizes the primary characteristics of alkalic-type epithermal gold (Au) deposits and provides an updated descriptive model. These deposits, primarily of Mesozoic to Neogene age, are among the largest epithermal gold deposits in the world. Considered a subset of low-sulfidation epithermal deposits, they are spatially and genetically...

Kelley, Karen D.; Spry, Paul G.; McLemore, Virginia T.; Fey, David L.; Anderson, Eric D.
Kelley, K.D., Spry, P.G., McLemore, V.T., Fey, D.L., and Anderson, E.D., 2020, Alkalic-type epithermal gold deposit model: U.S. Geological Survey Scientific Investigations Report 2010–5070–R, 74 p., https://doi.org/ 10.3133/ sir20105070R.

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Year Published: 2020

Spatial variability in seasonal snowpack trends across the Rio Grande headwaters (1984 - 2017)

This study evaluated the spatial variability of trends in simulated snowpack properties across the Rio Grande headwaters of Colorado using the SnowModel snow evolution modeling system. SnowModel simulations were performed using a grid resolution of 100 m and 3-hourly time step over a 34-yr period (1984–2017). Atmospheric forcing was provided by...

Sexstone, Graham A.; Penn, Colin A.; Liston, Glen; Gleason, Kelly; Moeser, C. David; Clow, David W.

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Year Published: 2020

The firn meltwater Retention Model Intercomparison Project (RetMIP): Evaluation of nine firn models at four weather station sites on the Greenland ice sheet

Perennial snow, or firn, covers 80 % of the Greenland ice sheet and has the capacity to retain surface meltwater, influencing the ice sheet mass balance and contribution to sea-level rise. Multilayer firn models are traditionally used to simulate firn processes and estimate meltwater retention. We present, intercompare and evaluate outputs from...

Vandecrux, Baptiste; Mottram, Ruth; Langen, Peter; Fausto, Robert; Olesen, Martin; Stevens, C. Max; Verjans, Vincent; Leeson, Amber; Ligtenberg, Stefan; Kuipers Munneke, Peter; Marchenko, Sergey S.; van Pelt, Ward; Meyer, Colin R.; Simonsen, Sebastian B.; Heilig, Achim; Samimi, Samira; Marshall, Shawn J.; Machguth, Horst; MacFerrin, Michael J.; Niwano, Masashi; Miller, Olivia L.; Voss, Clifford I.; Box, Jason E.

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Year Published: 2020

Assessing uranium and select trace elements associated with breccia pipe uranium deposits in the Colorado River and main tributaries in Grand Canyon, USA

Assessing chemical loading from streams in remote, difficult-to-access watersheds is challenging. The Grand Canyon area in northern Arizona, an international tourist destination and sacred place for many Native Americans, is characterized by broad plateaus divided by canyons as much as two-thousand meters deep and hosts some of the highest-grade...

Tillman, Fred; Anderson, Jessica; Unema, Joel; Chapin, Thomas
Tillman, F.D, Anderson, J.R., Unema, J.A., and Chapin, T.P., 2020, Assessing uranium and select trace elements associated with breccia pipe uranium deposits in the Colorado River and main tributaries in Grand Canyon, USA. PLoS ONE, 15(11): e0241502.

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Year Published: 2020

Wildfire and landscape change

Wildfire is a worldwide phenomenon that is expected to increase in extent and severity in the future, due to fuel accumulations, shifting land management practices, and climate change. It immediately affects the landscape by removing vegetation, depositing ash, influencing water-repellent soil formation, and physically weathering boulders and...

Santi, Paul M.; Rengers, Francis K.

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Year Published: 2020

Wildfire and Earth surface processes

Wildfire is a worldwide phenomenon that is expected to increase in extent and severity in the future, due to fuel accumulations, shifting land management practices, and climate change. It immediately affects the landscape by removing vegetation, depositing ash, influencing water-repellent soil formation, and physically weathering boulders and...

Santi, Paul M; Rengers, Francis K.

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Year Published: 2020

Geochemical assessment of groundwater in the Big Chino subbasin, Arizona, 2011–18

A geochemical characterization of groundwater in the Big Chino subbasin of Arizona was conducted by the U.S. Geological Survey, in cooperation with the City of Prescott, the Town of Prescott Valley, and the Salt River Project, to understand groundwater evolution through the study area and the source of water to springs along the gaining reach of...

Beisner, Kimberly R.; Jones, Casey J. R.
Beisner, K.R., and Jones, C.J.R., 2020, Geochemical assessment of groundwater in the Big Chino subbasin, Arizona, 2011–18: U.S. Geological Survey Scientific Investigations Report 2020–5094, 49 p., https://doi.org/10.3133/sir20205094.

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Year Published: 2020

Hydrologic properties of a highly permeable firn aquifer in the Wilkins Ice Shelf, Antarctica

We present measurements of the density, hydraulic conductivity, and specific discharge of a widespread firn aquifer in Antarctica, within the Wilkins Ice Shelf. At the field site, the aquifer is 16.2 m thick, starting at 13.4 m from the snow surface and transitioning from water‐saturated firn to ice at 29.6 m. Hydraulic conductivity...

Montgomery, Lynn; Miege, C.; MIller, Julie; Wallin, Bruce; Miller, Olivia L.; Scambos, Ted A.; Solomon, D Kip; Forster, Richard; Koenig, Lora

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Year Published: 2020

On the size of the flare associated with the solar proton event in 774 AD

The 774 AD solar proton event (SPE) detected in cosmogenic nuclides had an inferred >1 GV (>430 MeV) fluence estimated to have been ~30–70 times larger than that of the 1956 February 23 ground level event (GLE). The 1956 GLE was itself ~2.5 times larger at >430 MeV than the episode of strong GLE activity from 1989 August–October. We use...

Cliver, E. W.; Hayakawa, H.; Love, Jeffrey J.; Neidig, D. F.

Photos and videos described and linked on this webpage come from a wide variety of USGS science activities and presentations performed by USGS Science Center staff members in the Region 7-Upper Colorado Basin.

Filter Total Items: 524
pen tip next to lichen
April 27, 2016

Close-up of biocrust - lichen

Biological soil crusts, or biocrusts, are lichens, mosses, and cyanobacteria that grow on the soil surface and are common in the spaces between native plants in arid and semi-arid systems. Biocrusts reduce soil erosion, contribute to nutrient and water cycling, and reduce evaporation and invasion by exotic plants. The green-red plants with flower bud stalks are likely

...
Red Mountain, Colorado
April 19, 2016

Red Mountain near Silverton, Colorado

Intensely altered propylitic rocks (red and yellow) in the Red Mountain mining district, overprinting the regional, propylitically altered igneous rocks (grayish-green), peaks at top of image. View to west.

Measuring streamflow from a cableway, Green River blw Fontenelle Resv
April 18, 2016

Measuring streamflow from a cableway, Green River blw Fontenelle Resv

Measuring streamflow from a cableway using an ADCP, Green River blw Fontenelle Reservoir, WY

view of Salt Creek rock avalanche in Western Colorado from the top
April 15, 2016

Salt Creek Rock Avalanche in Western Colorado

Photograph taken from a Colorado National Guard helicopter looking north down the West Salt Creek rock avalanche deposit. On May 25, 2014, the central core of the rock avalanche deposit continued to move for 1-2 hours after the main rock avalanche deposit had stopped moving. Shallow landslides on the steep valley flanks continued for at least several days after the

...
Preparing to measure water level in streambank piezometer, New Fork R
April 1, 2016

Preparing to measure water level in streambank piezometer, New Fork R

Preparing to measure water level in streambank piezometer, New Fork R

Image: Panorama of Silverton, Colorado
March 15, 2016

Panorama of Silverton, Colorado

Panoramic photo of Silverton, Colorado, with Sultan Mountain in the distance.  Silverton is the town most directly affected by the

...
March 15, 2016

Mange in Wolves of Yellowstone National Park

This video describes USGS research utilizing remote thermal imaging cameras to study the extent and impact of mange on wolves in Yellowstone National Park.

Two anglers wade fishing on Big Horn River
March 4, 2016

Two anglers wade fishing on Big Horn River

Two anglers wade fishing on Big Horn River, Wyoming

February 23, 2016

Culvert trap

Biologists place a culvert trap in locations that they need data from.  Field crews will set up the culvert trap and check it daily, usually in the morning, to determine if a bear has been captured.  Additionally, trap doors are checked via radio telemetry. 

News items shown on this page are highlights of selected studies conducted and publications produced by USGS Science Center staff members in Region 7-Upper Colorado Basin.

Filter Total Items: 362
USGS science for a changing world logo
November 4, 2009

Greater sage-grouse populations have declined substantially in many areas in the West, though populations in some locations remain relatively stable, according to a comprehensive publication written by federal, state, and non-governmental organizations. The population assessment is one of numerous sage-grouse topics covered in the 24 chapters released today.

USGS science for a changing world logo
October 20, 2009

When Pierce County holds its "Shake 'n Quake" earthquake exercise Wednesday and Thursday, the foundation participants will use is a scenario developed by U.S. Geological Survey scientists here.

USGS science for a changing world logo
September 24, 2009

USGS will Grant Universities $5 Million to Beef Up Public Safety Grants totaling $5 million under the American Recovery and Reinvestment Act are being awarded to 13 universities nationwide to upgrade critical earthquake monitoring networks and increase public safety.

USGS science for a changing world logo
September 21, 2009

Idaho Developed Mapping Method Garners Prestigious Award. Data from earth observing Landsat satellites plays a central role in a new, award-winning type of mapping that tracks water use. Water-use maps help save taxpayer money by increasing the accuracy and effectiveness of public decisions involving water – for instance, in monitoring compliance with legal water rights. The maps are especially

USGS science for a changing world logo
September 14, 2009

Intersex in smallmouth and largemouth basses is widespread in numerous river basins throughout the United States is the major finding of the most comprehensive and large-scale evaluation of the condition, according to U.S. Geological Survey (USGS) research published online in Aquatic Toxicology.

USGS science for a changing world logo
September 9, 2009

The winter distribution of Pacific brant, a small, dark sea goose, has shifted northward from low-temperate areas such as Mexico to sub-Arctic areas as Alaska's climate has warmed over the last four decades, according to a just-released article in Arctic.

USGS science for a changing world logo
August 4, 2009

The U.S. Geological Survey today launched a website that provides water quality data for the Piceance Basin area of Western Colorado. The site, created and administered by the USGS, was developed to better address concerns about water quality in the Basin.

USGS science for a changing world logo
August 4, 2009

The 94th ESA Annual Meeting is being held Aug. 2-7 2009 at the Albuquerque Convention Center in Albuquerque, N.M. Scientists from across the world will convene to discuss ecology and a sustainable global society. Presentations by USGS scientists will include topics such as invasive plant species in a potential new climate and the relationship between soil nutrients and carbon dioxide emissions.

USGS science for a changing world logo
July 28, 2009

U.S. Geological Survey (USGS) research hydrologist Dr. Yousif Kharaka will present a talk in Cheyenne, Wyo. about the feasibility and implications of capturing and storing the greenhouse gas carbon dioxide underground in depleted oil fields and deep rock formations with salty aquifers.

USGS science for a changing world logo
July 16, 2009

Water produced by the High Plains aquifer, which provides water to eight states, is generally acceptable for human consumption, irrigation, and livestock watering, according to a U.S. Geological Survey study highlighted at the summer meeting of the Western States Water Council in Park City, Utah.

USGS science for a changing world logo
June 15, 2009

Tracking Native Mussels on the Mississippi River
For the first time ever, mussels in the Mississippi River will be radio tagged and their movements observed during the water-level drawdown that is scheduled to begin next week.

USGS science for a changing world logo
April 28, 2009

New U.S. Geological Survey research indicates that ammonia from water used in the production of natural gas from underground coal beds in Wyoming is entering the Powder River.
"High concentrations of ammonia are toxic, particularly at some of the higher pH values found in these discharged waters," said USGS scientist Richard Smith.

This page includes links to Social Media accounts (top of page), Science Centers (middle of page), and Regional Office staff members (bottom of page) of the USGS Region 7--Upper Colorado Basin.

USGS Science Centers in Region 7-Upper Colorado Basin conduct a large number of cooperative, co-funded science and monitoring projects with many other Federal, Tribal, State, and local agencies. Please scroll below to see the agencies with which those Science Centers currently have cooperative agreements.

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