Idaho water
River flow, reservoirs, snowpack, drought, irrigated land, water withdrawn for irrigation, livestock, industry and aquaculture, and water rights.
Data pages
| Measure | Value | Change | Rank |
|---|---|---|---|
| Idaho river flow2025Annual mean flow of the Snake, Salmon, Clearwater, Boise, Kootenai and Bear rivers at twelve long-record USGS gages, some reaching back to 1910.+34.4% since 2015 | 13,870 cfs ▲ | +34.4% since 2015 | |
| Idaho reservoir levels2026 (estimate)How full Idaho's major federal reservoirs are, each against its capacity and its 1991-2020 average, and on 30 September of every year on record.−27.4% since 2016 | 1.37 million acre-feet ▼ | −27.4% since 2016 | |
| Idaho drought conditionsOctober 6, 2026How much of Idaho is in drought, week by week since 2000, by county and beside other states, from the U.S. Drought Monitor.+137.9% since October 4, 2016 · 10th among states | 245 ▲ | +137.9% since October 4, 2016 | 10th among states |
| Idaho snowpackApril 1 snow water equivalent as a percent of median for Idaho's basins, from the Natural Resources Conservation Service. | by category | ||
| Idaho irrigated land2022Irrigated acres in Idaho from the Census of Agriculture, by county, over time and compared with other states, with water withdrawn for irrigation from the USGS.−10.6% since 1997 · 5th among states | 3.17 million acres ▼ | −10.6% since 1997 | 5th among states |
| Idaho water withdrawals2015 (estimate)Water withdrawn in Idaho for all uses, by category (irrigation, public supply, industry, thermoelectric power and others) and by county, from the USGS.−10.0% since 1990 | 19.87 million acre-feet ▲ | −10.0% since 1990 | |
| Idaho livestock water use2022 (estimate)Water withdrawn for livestock in Idaho in 2022, statewide, by county and compared with other states, from USGS modeled estimates.11th among states | 61,480 acre-feet | 11th among states | |
| Idaho aquaculture water use2023 (estimate)Water withdrawn for aquaculture in Idaho in 2013, 2018 and 2023, compared with every other state, from USGS estimates built on the Census of Aquaculture.+57.3% since 2013 · 1st of 47 among states | 3.87 million acre-feet ▲ | +57.3% since 2013 | 1st of 47 among states |
| Idaho industrial water use2020 (estimate)Water withdrawn by manufacturing facilities in Idaho in 2020, statewide, by county and compared with other states, from USGS modeled estimates.43rd of 49 among states | 14,242 acre-feet | 43rd of 49 among states | |
| Idaho water rights legal matters2026Contested cases, delivery calls and other legal matters before the Idaho Department of Water Resources, by type. | 93 | ||
| Eastern Snake Plain Aquifer levels2026 (provisional)Depth to water at 20 wells IDWR and USGS monitor across the Eastern Snake Plain Aquifer, part of the sentinel network from the 2015 water-use settlement.−2.2% since 2016 | 339.22 feet ▲ | −2.2% since 2016 |
Sources
In use
- Idaho Department of Water Resources: IDWR Legal Matters; Groundwater Level Data, Sentinel Wells network
- National Drought Mitigation Center, University of Nebraska-Lincoln: U.S. Drought Monitor
- U.S. Bureau of Reclamation: Pacific Northwest Hydromet, reservoir storage
- U.S. Geological Survey: USGS Surface-Water Annual Statistics, Idaho streamgages; Estimated Use of Water in the United States; Livestock water-use withdrawal estimates, 2022; Aquaculture water-use withdrawal estimates; Industrial water use by county, 2020
- USDA National Agricultural Statistics Service: Census of Agriculture: Irrigated Land
- USDA Natural Resources Conservation Service: SNOTEL: 1 April Snow Water Equivalent, Percent of Median
This page was last updated .