A5048551925- Water Quality and Resources Studies
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Groundwater and Isotope Geochemistry
- Groundwater flow and contamination studies
- Archaeology and Natural History
- Soil erosion and sediment transport
- Soil and Water Nutrient Dynamics
- Marine and Offshore Engineering Studies
- Geological formations and processes
- Rangeland and Wildlife Management
- Landslides and related hazards
Salinity and dissolved selenium are known water-quality impairments in the lower Gunnison River watershed of western Colorado. is a concern because its adverse effects on agricultural land equipment, municipal industrial users. The Montrose Arroyo Montrose, Colorado, contains residential areas as well undeveloped has undergone substantial land-use change since early 1990s. Previous sampling efforts indicated salinity concentrations loads have remained constant began 1990s; however, recent...
The Colorado River Basin provides habitat for 14 native fish, including 4 endangered species protected under the Federal Endangered Species Act of 1973. These fish once thrived in system, but water-resource development, building numerous diversion dams and several large reservoirs, introduction non-native resulted reductions numbers range four through loss stream function. Understanding how conditions change response to alterations streamflow is important water administrators wildlife...
First posted July 10, 2023 For additional information, contact: Director, Colorado Water Science CenterU.S. Geological SurveyBox 25048, Mail Stop 415Denver, 80225 Salinity control efforts in the River Basin have focused on mobilization of salts from irrigated land, but nonirrigated rangelands are also a source salinity. In particular, lands where soils formed Late Cretaceous Mancos Shale under arid and semiarid climates contain considerable quantities salt, mainly subsurface. Hundreds...
First posted June 13, 2018 For additional information, contact: Director, Colorado Water Science CenterU.S. Geological SurveyBox 25046, MS 415Denver, CO 80225 In response to the need for more information about selenium (Se) sources and transport, U.S. Survey, in cooperation with Conservation Board, completed a study that characterized Se loads reach of Gunnison River between Delta Grand Junction, Colo. This report identifies where possible dissolved loading is occurring Lower Basin Junction...
The lower Gunnison River Basin of the Colorado has elevated salinity and selenium levels. Salinity Control Act June 24, 1974 (Public Law 93–320, amended by Public 98–569), authorized investigation Lower Unit Project U.S. Department Interior. Bureau Reclamation (Reclamation) Natural Resources Conservation Service are responsible for assessing implementing measures to reduce loading in Basin. Cost-sharing programs help farmers, ranchers, canal companies improve efficiency water delivery...
From the early mining days to current tourism-based economy, Eagle River watershed (ERW) in central Colorado has undergone a sequence of land-use changes that affected hydrology, habitat, and water quality area. In 2000, USGS, cooperation with Water Conservation District, County, Sanitation Upper Regional Authority, Department Transportation, City Aurora, Town Eagle, Gypsum, Minturn, Vail, Vail Resorts, Springs, Springs Utilities, Denver Water, initiated retrospective analysis surface-water...
First posted April 7, 2022 For additional information, contact: Director, Colorado Water Science CenterU.S. Geological SurveyBox 25046, MS-415Denver, CO 80225 The U.S. Survey, in cooperation with the Department of Transportation, installed and operated real-time scour monitoring instrumentation at two bridges 2016 2017 to measure streambed elevations real-time. included acoustic echosounder depth sensors mounted bridge substructure units rigid conduit fittings. Although functional, mounting...
Channel rehabilitation, or reconfiguration, to mitigate a variety of riverine problems has become common practice in the western United States. However, additional work monitor and assess channel response to, effectiveness of, these modifications over longer periods time (decadal longer) is still needed. The Lake Fork Gunnison River been an area active modification accommodate needs City community since 1950s. Valley Conservancy District began planning process restoration options for reach...
Increasing salinity loading in the Colorado River has become a major concern for agricultural and municipal water supplies. The Salinity Control Act was implemented 1974 to protect enhance quality of Basin. U.S. Geological Survey, cooperation with Bureau Reclamation Forum, summarized reductions McElmo Creek basin southwest as result salinity-control modifications flow-regime changes that from Dolores Project, which consists construction McPhee reservoir on control along irrigation delivery...
First posted August 20, 2021 For additional information, contact: Director, Colorado Water Science CenterU.S. Geological SurveyBox 25046, MS-415Denver, CO 80225 Diel cycles are known to occur in all types of waters, and increasing studies indicate routine water samples may not provide an accurate snapshot concentrations trace elements nutrients. behavior neutral alkaline pH ranges is independent streamflow variability concentration. Extensive historical U.S. Survey (USGS) water-quality data...