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| Snake River Plain aquifer | |
|---|---|
| Name | Snake River Plain aquifer |
| Location | Idaho |
| Region | Snake River Plain |
| Type | Aquifer |
| Area | Approximately 9,300 km² |
| Primary recharge | Snake River seepage, mountain runoff, irrigation return flow |
| Discharge | Springs, river gains, wells in Ada County, Bingham County |
Snake River Plain aquifer
The Snake River Plain aquifer is a major basaltic groundwater system underlying much of the Snake River Plain in Idaho, providing water for cities like Boise and Idaho Falls and supporting agriculture in the Magic Valley and Treasure Valley. The aquifer interacts with the Snake River and regional volcanism from the Yellowstone hotspot, supplying irrigation, municipal, and industrial uses while facing pressures from population growth, agricultural return flow, and legacy contamination near facilities such as the Idaho National Laboratory. Scientific study involves institutions including the United States Geological Survey, Idaho Department of Water Resources, University of Idaho, and Boise State University.
The aquifer extends across the eastern and southern portions of the Snake River Plain from near Shoshone and Twin Falls westward toward Boise, underlying counties such as Gooding County, Idaho, Jerome County, Idaho, Bannock County, Idaho, Bingham County, Idaho, and Ada County, Idaho. Groundwater flow generally follows the regional gradient toward the Snake River, with hydraulically connected reaches near American Falls Reservoir and gains and losses mapped by the United States Geological Survey. Recharge is supplied by seepage from the Snake River, snowmelt runoff from the Sawtooth Range and Bitterroot Range, and managed recharge from irrigation districts like the Twin Falls Canal Company. Hydrogeologic frameworks use borehole logs, geophysical surveys, and tracer studies by the Idaho National Laboratory and U.S. Army Corps of Engineers to resolve basalt flow units correlated with exposures at Craters of the Moon National Monument and Preserve.
Bedrock beneath the aquifer is dominated by Quaternary and late Tertiary basalt flows of the Snake River Group emplaced during migration of the Yellowstone hotspot and related rift and plume volcanism. Stratigraphy includes stacked pahoehoe and aa flows, intercalated paleosols, and localized sedimentary deposits correlated to units studied at Craters of the Moon and exposures near Kimberly. Structural controls from the Idaho Batholith margin and faulting along the Lost River Fault and Big Lost River graben influence permeability anisotropy. Permeability is governed by fracture networks, vesicular flow tops, and interflow contacts, producing high transmissivity zones exploited by municipal wellfields like Eagle, Idaho and managed aquifer recharge projects evaluated by the U.S. Geological Survey and Idaho Department of Water Resources.
The aquifer supplies municipal water for Boise, Nampa, Caldwell, and Idaho Falls, and underpins irrigation for crops in the Snake River Plain irrigation district including alfalfa, potatoes in the Magic Valley, sugar beets historically associated with Amalgamated Sugar Company, and hops for craft breweries tied to markets in Portland, Oregon and Seattle. Groundwater pumping is regulated via water rights adjudications in cases heard in United States District Court for the District of Idaho and managed by the Idaho Department of Water Resources. Large groundwater users include Micron Technology, Inc. in the Boise metropolitan area and agricultural cooperatives around Jerome and Burley. Managed aquifer recharge and conjunctive use strategies have been developed in coordination with entities such as the Bonneville Power Administration and regional irrigation districts to balance hydroelectric scheduling at Brownlee Dam and reservoir operations at American Falls Reservoir.
Water quality varies spatially with low natural salinity in many basalt-dominated reaches but localized high nitrate and arsenic concentrations near intensive agriculture in the Twin Falls and Magic Valley areas, documented by monitoring from the Idaho Department of Environmental Quality and United States Geological Survey. Legacy contamination from the Idaho National Laboratory includes tritium and other radionuclides detected in plume studies, prompting remediation oversight by the Department of Energy and state agencies. Pesticide residues and nitrate from fertilizer application have produced concerns led by researchers at the University of Idaho and Idaho State University, while evaporative concentration in irrigated areas interacts with vadose zone processes examined by the U.S. Geological Survey and Environmental Protection Agency. Mitigation efforts reference standards under the Safe Drinking Water Act and collaborate with municipal water utilities such as Boise WaterShed for treatment upgrades.
Groundwater monitoring is conducted by the United States Geological Survey, Idaho Department of Water Resources, and local irrigation districts using networks of wells, pressure transducers, and isotopic tracer analyses performed at universities like the University of Idaho and labs at the Idaho National Laboratory. Groundwater management includes water-right administration, conjunctive use planning, and conservation programs promoted by Idaho Power Company and regional planning organizations like the Treasure Valley Partnership. Conservation measures include demand management, irrigation efficiency upgrades through the Natural Resources Conservation Service, managed recharge projects modeled with software from the U.S. Geological Survey and National Oceanic and Atmospheric Administration hydrologic data, and land-use planning coordinated with county governments such as Ada County, Idaho. Science-policy interfaces involve stakeholder groups including the Bonneville Environmental Foundation and agricultural extension services from the University of Idaho Extension.
The aquifer supports spring-fed habitats and riparian corridors along the Snake River and its tributaries, sustaining fish populations in reaches used by Pacific lamprey and anadromous steelhead where permitted by passage infrastructure coordinated with the Bonneville Power Administration and U.S. Fish and Wildlife Service. Groundwater extraction and altered flow regimes affect wetlands near Massacre Rocks State Park and the Minidoka National Wildlife Refuge, influencing migratory bird habitat monitored by the U.S. Fish and Wildlife Service and Audubon Society. Temperature and baseflow changes have implications for native species like the Idaho giant salamander and endemic invertebrates studied by researchers at the Idaho Museum of Natural History and Idaho State University. Remediation and conservation projects often involve partnerships with the The Nature Conservancy and state parks such as Lucky Peak State Park to restore springs, manage invasive species, and maintain water quality for ecological resilience.
Category:Aquifers of the United States Category:Landforms of Idaho