Water Supply Overview
Idaho water supply information and data is available to the public through the combined efforts of state and federal governmental agencies involved in water management in Idaho. Each agency brings a different technical aspect and expertise in order to provide the most extensive water supply outlook available.
Water Supply Committee
Overview
As soon as information concerning the upcoming year’s water supply becomes available, IDWR begins analyzing the data to determine if there is potential for a water supply problem. If it becomes apparent that a problem could occur, IDWR alerts the Governor’s Office and organizes a water supply committee to coordinate all drought-related activities in Idaho. This reduces confusion and sets up a means to provide the public with the best possible advice on steps which can be taken to minimize the drought’s impact.
Depending upon the stage and magnitude of the water supply problem, the Water Supply Committee may organize a variety of subcommittees (described below) to help meet its goals. The committee chairman can request that various organizations assign personnel to the subcommittees, and then appoints a chairman for each subcommittee. Each subcommittee chairman is responsible for the organization, membership, and function of the subcommittee and reports to the Water Supply Committee on activities, goals, and progress.
Historical Background
Idaho usually has adequate surface water supplies, but those water supplies are cyclic. Some years, there is too much and other years not enough. Idaho has experienced a number of water shortages. The earliest well-documented shortages occurred in the 1920s and 1930s during the Dust Bowl era. These historic records are still used today as a benchmark in evaluating potential problems.
Idaho has not been without problems since then. During the early 1960s, several areas in the state experienced water shortages. In 1977, the worst single year on record, a severe water shortage occurred throughout Idaho and the West. In 1987, the water supply ranged from 10 to 50 percent below normal over many areas of the state. The impacts were kept to a minimum because of a good reservoir carry-over supply from 1986 and judicious use of water.
In 1988, even though the overall supply was better (at around 70 percent of normal), the impact was greater because of poor carry-over reservoir storage and dry soil conditions. Conditions in 1991 and 1992 mirrored conditions in 1987 and 1988. Overall, conditions between 1987 and 1993 in the southwestern part of Idaho have displaced the Dust Bowl period of the 1930s as the most severe period of drought on record.
As a result of the 1977 drought, state, federal, and local agencies directed considerable effort toward drought planning and assistance. Valuable information was collected, many water supply problems were addressed, and drought response procedures were developed. An important item not completed in 1977, was the production of a “Drought Plan.” In 1990, a plan was designed to fill that need. The Idaho Water Supply Committee was developed as one action element of that plan.
Role of the Committee
The Water Supply Committee:
- Compiles all data to provide the most comprehensive information available concerning the drought.
- Coordinates with the various agencies to avoid conflict or duplication and expedites the administrative process.
- Provides responsible and timely public information.
- Encourages water and energy conservation.
Committee Organization
The Water Supply Committee is composed of key state, federal, and private agencies that have interests, constituents, and responsibilities which might be impacted by the water supply situation. The standing water supply committee is composed of, but is not limited to, the following agencies:
- Idaho Department of Water Resources – Chair
- Idaho Bureau of Disaster Services
- Idaho Department of Health and Welfare, Division of Environmental Quality
- Idaho Department of Agriculture
- University of Idaho Cooperative Extension Service
- Idaho Department of Fish and Game
- Idaho Department of Commerce
- U.S. Bureau of Reclamation
- National Weather Service
- Natural Resource Conservation Service
- U.S. Army Corps of Engineers
- U.S. Geological Survey
- U.S. Forest Service
- Consolidated Farm Service Agency
- Idaho Power Company
Committee Goals
The Water Supply Committee meets and reviews the best information available relative to the water supply. The committee implements the response process with the following goals:
- Supply adequate domestic (culinary) water for public health, safety, and welfare as a first priority.
- Minimize adverse drought effects on the state’s economy, environment, and social well-being.
- Maintain municipal supplies to meet community needs.
- Efficiently use available water supplies to provide for agricultural needs. Farm activities must be planned with a knowledge of anticipated water supplies.
- Maintain productive Idaho industries to provide a stable local economy.
- Modify water and land management practices, where possible, to minimize environmental impacts.
- Protect fish and wildlife to the extent practical by water and land management.
- Protect recreation interests to the extent practical by water and land management.
- Minimize forest and range hazard due to fire and erosion to the extent practical by land management.
- Institute electrical energy conservation practices to assure an adequate supply for all purposes.
- Carefully manage reservoir storage and releases to maximize total water-related benefits.
- Protect navigation capability, where essential to the economic well-being of a community, to the extent possible through streamflow management.
If a severe water shortage seems possible, the committee may develop a formal contingency plan. During the 1987–1994 period, some steps were partially implemented because even though the shortage was the worst in 50 years, it was not necessary for state government to implement a demand reduction program. The committee did encourage that some steps be the responsibility of local city or county governments. The committee provided technical and administrative support and helped local governments develop programs suited to their individual problems. A drought plan was developed and the Water Data Subcommittee implemented a monitoring program.
Water Supply Subcommittees
Water Data Subcommittee
- Compile and analyze water supply and energy data and forecast water supply availability. Provide technical assistance to the other subcommittees.
- Membership includes IDWR, National Weather Service (NWS), Bureau of Reclamation (BOR), Natural Resource Conservation Service (NRCS), U.S. Army Corps of Engineers (COE), and U.S. Geological Survey (USGS).
Energy Subcommittee
- Evaluate and monitor energy supplies; coordinate with other subcommittees.
- Coordinate with the state member of the Northwest Power Planning Council.
- Membership includes Idaho Northwest Power Planning Council, Idaho Public Utilities Commission, Bonneville Power Administration, Idaho Power Co., IDWR, the Association of Commerce and Industry, COE, and BOR.
Public Information Subcommittee
- Organize information about the drought and conservation measures in a form understandable to the public.
- Coordinate public information distributed from individual organizations in order to prevent public confusion.
- Membership should include information officers from public organizations.
Fish, Wildlife, Recreation, and Environment Subcommittee
- Investigate and monitor areas of critical need to determine where habitat might be threatened and where water and land management practices could improve fish, wildlife, and recreational values, including water quality problems.
- Determine potential of impact to recreation and tourism. Coordinate with Public Information Subcommittee to provide positive recreation information minimizing impact to the tourism industry.
- Monitor land management, fire suppression, and issues relative to impacts and actions on grazing and operational changes dealing with fire hazard and suppression.
- Membership includes Idaho Department of Commerce, Idaho Department of Fish and Game, U.S. Fish & Wildlife Service, Idaho Department of Lands, Idaho Division of Environmental Quality, Idaho Department of Parks and Recreation, U.S. Forest Service, and U.S. Bureau of Land Management.
Municipal, Industrial, and Water Quality Subcommittee
- Investigate and monitor water shortage problems with municipal systems and industrial users; provide technical assistance. Coordinate energy issues with the Energy Subcommittee.
- Membership includes IDWR, Idaho Department of Health and Welfare (HW) (also health districts), Association of Commerce and Industry, and the Association of Idaho Cities.
Economic Subcommittee
- Evaluate and monitor needs of individuals and organizations financially affected by the drought.
- Assist in obtaining financing for supplementary water sources.
- Membership includes Farmers Home Administration, Conservation Farm Service Agency, Idaho Bankers Association, Idaho Department of Commerce, Legislative Revenue and Taxation Committee, and the Budget Bureau.
Upcoming Water Supply Meetings
2025 Fall Water Supply Outlook Meeting
When: TBA
Where: TBA
Virtual Option: TBA
River Flow Data
For real-time flow information, use the links in the list or select a gage from the table.
Snow Water Equivalency
Snow Water Equivalent (SWE) is a common snowpack measurement. It is the amount of water contained within the snowpack. Maps are posted weekly from January through March or early April.
Current SWE Map
| Date | Mountain Snow Water Equivalent Map |
|---|---|
| February 23, 2026 | Idaho Snow Map: February 23, 2026 |
| February 16, 2026 | Idaho Snow Map: February 16, 2026 |
| February 9, 2026 | Idaho Snow Map: February 9, 2026 |
| February 2, 2026 | Idaho Snow Map: February 2, 2026 |
| January 26, 2026 | Idaho Snow Map: January 26, 2026 |
| January 19, 2026 | Idaho Snow Map: January 19, 2026 |
| January 12, 2026 | Idaho Snow Map: January 12, 2026 |
| January 5, 2026 | Idaho Snow Map: January 5, 2026 |
| May 5, 2025 | Idaho Snow Map: May 5, 2025 |
| March 31, 2025 | Idaho Snow Map: March 31, 2025 |
| March 24, 2025 | Idaho Snow Map: March 24, 2025 |
| March 17, 2025 | Idaho Snow Map: March 17, 2025 |
| March 10, 2025 | Idaho Snow Map: March 10, 2025 |
| March 3, 2025 | Idaho Snow Map: March 3, 2025 |
| February 24, 2025 | Idaho Snow Map: February 24, 2025 |
| February 17, 2025 | Idaho Snow Map: February 17, 2025 |
| February 10, 2025 | Idaho Snow Map: February 10, 2025 |
| February 3, 2025 | Idaho Snow Map: February 3, 2025 |
| January 27, 2025 | Idaho Snow Map: January 27, 2025 |
| January 21, 2025 | Idaho Snow Map: January 21, 2025 |
| January 13, 2025 | Idaho Snow Map: January 13, 2025 |
| January 6, 2025 | Idaho Snow Map: January 6, 2025 |
| December 30, 2024 | Idaho Snow Map: December 30, 2024 |
| April 15, 2024 | Idaho Snow Map: April 15, 2024 |
| April 8, 2024 | Idaho Snow Map: April 8, 2024 |
| April 1, 2024 | Idaho Snow Map: April 1, 2024 |
| March 25, 2024 | Idaho Snow Map: March 25, 2024 |
| March 18, 2024 | Idaho Snow Map: March 18, 2024 |
| March 11, 2024 | Idaho Snow Map: March 11, 2024 |
| March 4, 2024 | Idaho Snow Map: March 4, 2024 |
| February 26, 2024 | Idaho Snow Map: February 26, 2024 |
| February 20, 2024 | Idaho Snow Map: February 20, 2024 |
| February 12, 2024 | Idaho Snow Map: February 12, 2024 |
| February 5, 2024 | Idaho Snow Map: February 5, 2024 |
| January 30, 2024 | Idaho Snow Map: January 30, 2024 |
| January 22, 2024 | Idaho Snow Map: January 22, 2024 |
| January 16, 2024 | Idaho Snow Map: January 16, 2024 |
| January 8, 2024 | Idaho Snow Map: January 8, 2024 |
| January 2, 2024 | Idaho Snow Map: January 2, 2024 |
| April 3, 2023 | Idaho Snow Map: April 3, 2023 |
| March 27, 2023 | Idaho Snow Map: March 27, 2023 |
| March 20, 2023 | Idaho Snow Map: March 20, 2023 |
| March 13, 2023 | Idaho Snow Map: March 13, 2023 |
| March 6, 2023 | Idaho Snow Map: March 6, 2023 |
| February 27, 2023 | Idaho Snow Map: February 27, 2023 |
| February 21, 2023 | Idaho Snow Map: February 21, 2023 |
| February 13, 2023 | Idaho Snow Map: February 13, 2023 |
| February 6, 2023 | Idaho Snow Map: February 6, 2023 |
| January 30, 2023 | Idaho Snow Map: January 30, 2023 |
| January 23, 2023 | Idaho Snow Map: January 23, 2023 |
| January 17, 2023 | Idaho Snow Map: January 17, 2023 |
| January 9, 2023 | Idaho Snow Map: January 9, 2023 |
| January 3, 2023 | Idaho Snow Map: January 3, 2023 |
| April 1, 2022 | Idaho Snow Map: April 1, 2022 |
| March 28, 2022 | Idaho Snow Map: March 28, 2022 |
| March 21, 2022 | Idaho Snow Map: March 21, 2022 |
| March 14, 2022 | Idaho Snow Map: March 14, 2022 |
| March 7, 2022 | Idaho Snow Map: March 7, 2022 |
| February 28, 2022 | Idaho Snow Map: February 28, 2022 |
| February 22, 2022 | Idaho Snow Map: February 22, 2022 |
| February 14, 2022 | Idaho Snow Map: February 14, 2022 |
| February 7, 2022 | Idaho Snow Map: February 7, 2022 |
| January 31, 2022 | Idaho Snow Map: January 31, 2022 |
| January 24, 2022 | Idaho Snow Map: January 24, 2022 |
| January 18, 2022 | Idaho Snow Map: January 18, 2022 |
| January 10, 2022 | Idaho Snow Map: January 10, 2022 |
| January 3, 2022 | Idaho Snow Map: January 3, 2022 |
| December 27, 2021 | Idaho Snow Map: December 27, 2021 |
| March 29, 2021 | Idaho Snow Map: March 29, 2021 |
| March 22, 2021 | Idaho Snow Map: March 22, 2021 |
| March 15, 2021 | Idaho Snow Map: March 15, 2021 |
| March 8, 2021 | Idaho Snow Map: March 8, 2021 |
| March 1, 2021 | Idaho Snow Map: March 1, 2021 |
| February 22, 2021 | Idaho Snow Map: February 22, 2021 |
| February 16, 2021 | Idaho Snow Map: February 16, 2021 |
| February 8, 2021 | Idaho Snow Map: February 8, 2021 |
| February 1, 2021 | Idaho Snow Map: February 1, 2021 |
| January 25, 2021 | Idaho Snow Map: January 25, 2021 |
| January 19, 2021 | Idaho Snow Map: January 19, 2021 |
| January 11, 2021 | Idaho Snow Map: January 11, 2021 |
| January 4, 2021 | Idaho Snow Map: January 4, 2021 |
| December 28, 2020 | Idaho Snow Map: December 28, 2020 |
| March 30, 2020 | Idaho Snow Map: March 30, 2020 |
| March 16, 2020 | Idaho Snow Map: March 16, 2020 |
| March 9, 2020 | Idaho Snow Map:March 9, 2020 |
| March 2, 2020 | Idaho Snow Map:March 2, 2020 |
| February 24, 2020 | Idaho Snow Map: February 24, 2020 |
| February 17, 2020 | Idaho Snow Map: February 17, 2020 |
| February 10, 2020 | Idaho Snow Map: February 10, 2020 |
| February 3, 2020 | Idaho Snow Map: February 3, 2020 |
| January 27, 2020 | Idaho Snow Map: January 27, 2020 |
| January 21, 2020 |  |
| January 13, 2020 |  |
| January 6, 2020 |  |
| December 23, 2019 |  |
| December 17, 2019 |  |
| April 1, 2019 |  |
| March 25, 2019 |  |
| March 18, 2019 |  |
| March 11, 2019 |  |
| March 4, 2019 |  |
| February 25, 2019 |  |
| February 18, 2019 |  |
| February 11, 2019 |  |
| February 5, 2019 |  |
| January 28, 2019 |  |
| January 22, 2019 |  |
| January 14, 2019 |  |
| January 8, 2019 |  |
| January 1, 2019 |  |
| December 31, 2018 |  |
| December 24, 2018 |  |
| December 17, 2018 |  |
| April 2, 2018 |  |
| March 26, 2018 |  |
| March 19, 2018 |  |
| March 12, 2018 |  |
| March 5, 2018 |  |
| February 27, 2018 |  |
| February 20, 2018 |  |
| February 12, 2018 |  |
| February 5, 2018 |  |
| January 29, 2018 |  |
| January 22, 2018 |  |
| January 16, 2018 |  |
| January 8, 2018 |  |
| January 2, 2018 |  |
| December 28, 2017 |  |
| December 18, 2017 |  |
| December 11, 2017 |  |
| December 4, 2017 |  |
| April 3, 2017 |  |
| March 20, 2017 |  |
| March 13, 2017 |  |
| March 6, 2017 |  |
| February 27, 2017 |  |
| February 21, 2017 |  |
| February 13, 2017 |  |
| February 6, 2017 |  |
| January 30, 2017 |  |
| January 22, 2017 |  |
| January 17, 2017 |  |
| January 9, 2017 |  |
| January 3, 2017 |  |
| December 27, 2016 |  |
| December 19, 2016 |  |
| April 4, 2016 |  |
| March 28, 2016 |  |
| March 21, 2016 |  |
| March 14, 2016 |  |
| March 7, 2016 |  |
| February 29, 2016 |  |
| February 22, 2016 |  |
| February 16, 2016 |  |
| February 8, 2016 |  |
| February 1, 2016 |  |
| January 25, 2016 |  |
| January 19, 2016 |  |
| January 11, 2016 |  |
| January 4, 2016 |  |
| December 28, 2015 |  |
| December 22, 2015 |  |
| March 30, 2015 |  |
| March 23, 2015 |  |
| March 16, 2015 |  |
| March 9, 2015 |  |
| March 2, 2015 |  |
| February 23, 2015 |  |
| February 17, 2015 |  |
| February 9, 2015 |  |
| February 2, 2015 |  |
| January 26, 2015 |  |
| January 22, 2015 |  |
| January 12, 2015 |  |
| January 5, 2015 |  |
| December 29, 2014 |  |
| December 23, 2014 |  |
| April 7, 2014 |  |
| March 31, 2014 |  |
| March 24, 2014 |  |
| March 17, 2014 |  |
| March 10, 2014 |  |
| March 3, 2014 |  |
| February 24, 2014 |  |
| February 18, 2014 |  |
| February 10, 2014 |  |
| February 3, 2014 |  |
| January 27, 2014 |  |
| January 21, 2014 |  |
| January 13, 2014 |  |
| January 6, 2014 |  |
| December 30, 2013 |  |
| April 10, 2013 |  |
| April 1, 2013 |  |
| March 25, 2013 |  |
| March 18, 2013 |  |
| March 11, 2013 |  |
| March 4, 2013 |  |
| February 25, 2013 |  |
| February 19, 2013 |  |
| February 11, 2013 |  |
| February 4, 2013 |  |
| January 28, 2013 |  |
| January 22, 2013 |  |
| January 14, 2013 |  |
| January 7, 2013 |  |
| January 2, 2013 |  |
| December 17, 2012 |  |
| December 10, 2012 |  |
| April 9, 2012 |  |
| April 2, 2012 |  |
| March 26, 2012 |  |
| March 19, 2012 |  |
| March 12, 2012 |  |
| March 5, 2012 |  |
| February 27, 2012 |  |
| February 21, 2012 |  |
| February 13, 2012 |  |
| February 6, 2012 |  |
| January 30, 2012 |  |
| January 23, 2012 |  |
| January 17, 2012 |  |
| January 9, 2012 |  |
| January 3, 2012 |  |
| December 28, 2011 |  |
| April 11, 2011 |  |
| April 4, 2011 |  |
| March 28, 2011 |  |
| March 21, 2011 |  |
| March 15, 2011 |  |
| March 7, 2011 |  |
| February 28, 2011 |  |
| February 22, 2011 |  |
| February 14, 2011 |  |
| February 7, 2011 |  |
| January 31, 2011 |  |
| January 24, 2011 |  |
| January 18, 2011 |  |
| January 10, 2011 |  |
| January 3, 2011 |  |
| December 20, 2010 |  |
| April 5, 2010 |  |
| March 29, 2010 |  |
| March 22, 2010 |  |
| March 15, 2010 |  |
| March 8, 2010 |  |
| March 1, 2010 |  |
| February 22, 2010 |  |
| February 16, 2010 |  |
| February 8, 2010 |  |
| February 1, 2010 |  |
| January 25, 2010 |  |
| January 19, 2010 |  |
| January 11, 2010 |  |
| January 4, 2010 |  |
| December 28, 2009 |  |
| December 21, 2009 |  |
| December 14, 2009 |  |
| April 14, 2009 |  |
| April 7, 2009 |  |
| April 3, 2009 |  |
| March 31, 2009 |  |
| March 24, 2009 |  |
| March 16, 2009 |  |
| March 9, 2009 |  |
| March 4, 2009 |  |
| February 23, 2009 |  |
| February 18, 2009 |  |
| February 10, 2009 |  |
| February 3, 2009 |  |
| January 26, 2009 |  |
| January 20, 2009 |  |
| January 13, 2009 |  |
| January 6, 2009 |  |
| December 30, 2008 |  |
| December 22, 2008 |  |
| December 15, 2008 |  |
Water Supply Data Sources
The technical data sources listed below are used by the Water Supply Committee to prepare the comprehensive water supply outlook.
| Topic | Link | Description | Source |
|---|---|---|---|
| Weather | Idaho Annual Average Precipitation | Graphical map of Idaho's annual average precipitation | IDWR |
| Drought | Drought Declarations Issued by IDWR | Idaho counties with Drought Emergency Declaration orders | IDWR |
| Rivers | River Flows for Recreationists | Flow in cubic feet per second (cfs) for rivers of local interest | USGS, USBR, Idaho Power |
| Snow | Snow Water Equivalency | Weekly maps showing snowpack measurement in Idaho | IDWR |
| Reservoir Storage | Bear River "Teacup" Diagrams | Reservoir levels and average daily streamflows | BRCBear River Commission |
| Weather | Warnings and Watches: Southwest Idaho | Climate predictions for southwest Idaho | NOAA |
| Snow | Snow Cover Information (by location) | Graphic snow parameter for the Western United States and the Columbia Basin | NWS, NOAA |
| Weather | Warnings and Watches: Central Idaho | Climate predictions for central Idaho | NOAA |
| Weather | Warnings and Watches: Northern Idaho | Climate predictions for northern Idaho | NOAA |
| Weather | Warnings and Watches: Southeast Idaho | Climate predictions for southeast Idaho | NOAA |
| Weather | National 10-Day Precipitation Outlook | Graphical precipitation forecast | IGES |
| Weather | National 10-Day Temperature Outlook | Graphical temperature forecast | IGES |
| Weather | Northwest Weather Radar Image | Current weather radar image | NOAA, NWS |
| Rivers | River Flow Information (by river) | Real-time streamflow data | USGS |
| Reservoir Storage | Mackay Reservoir Levels | Data for the Mackay Reservoir near Mackay, Idaho | USGS |
| Snow | Snowpack Basin Index | Based on mountain data from NRCS SNOTEL sites | NRCS |
| Weather | Western Regional Climate Center | Climate data and predictions for the western United States | WRCC |
| Weather | El Niño and La Niña: Frequently Asked Questions | Commonly asked questions and their answers regarding El Niño and La Niñael nino, la nina | WRCC |
| Weather | National Long Range Precipitation & Temperature Outlook | One year outlooks in 90-day intervals | WRCC |
| Snow | Western US SNOTEL Information | Narrative and mapped SNOTEL climate information | WRCC |
| Weather | Idaho Climate Summaries | Interactive map of climate data | WRCC |
| Rivers | Colorado Basin River Forecast Center | River conditions in the Colorado Basin | NOAA |
| Weather | Climate Prediction Center | Climate predictions for the United States | NOAA |
| Weather | El Niño and La Niña: Basic Facts & Background | Advisories and predictions for El Niño and La Niña conditionsel nino, la nina | NOAA |
| Drought | Palmer Drought Index | Color-coded drought severity map of the United States | NOAA |
| Drought | Drought Assessment Information | Weekly United States drought assessment from the Climate Prediction Center | NOAA |
| Snow | National Snow Information | Daily snow depth and snow fall information from the Climate Prediction Center | NOAA |
| Rivers | River Flow Information (by river) | Real-time streamflow data | Idaho Power |
| Snow | Satellite Snow Cover Maps (by month) | Satellite areal extent of snow cover | NRCS, NWCC, NOAA |
| Snow | Basin Comparison Graphs | Links to time series plots of current water year basin snowpack and precipitation compared to other years | NRCS |
| Snow | Basin Projection Graphs | Links to time series plots of current water year basin snowpack and precipitation with non-exceedance for the remainder of the water year | NRCS |
| Rivers | Daily Guidance Streamflow Forecasts | Daily forecasts using SNOTEL data | NRCS |
| Rivers | Peak Streamflow for Individual Basins | Snow-Stream comparison graphs to monitor peak streamflows | NRCS |
| Snow | Idaho Snow Survey | Mountain snowpack data and streamflow forecasts for the western United States | NRCS |
| Snow | SNOTEL Interactive Map - Snow Water Equivalent (Station/Basin Conditions) | Interactive map showing daily station/basin snowpack measurement in Idaho | NRCS |
| Reservoir Storage | Pacific Northwest System Information | Reservoir Data is under Report List on this page from USCE | USCE |
| Rivers | Northwest River Forecast Center | River and hydrology 10-day and 120-day forecast points | NOAA |
| Weather | Idaho Evapotranspiration Charts | Crop water use charts | USBR |
| Reservoir Storage | Boise and Payette River Systems | Reservoir levels and average daily streamflows | USBR |
| Reservoir Storage | Upper Snake River System | Reservoir levels and average daily streamflows | USBR |
| Reservoir Storage | River Basin Reports | Near real-time Pacific Northwest water and environmental data | USBR |
| Rivers | Surface Water Data | Current and average streamflow and lake level data | USGS |
| Snow | West-wide Snowpack Map | Monthly mountain snowpack maps | NRCS |
| Rivers | Western U.S. Streamflow Forecast Map | Monthly streamflow forecasts | NRCS |
| Snow | Snow Water Equivalent % of Normal | Weekly maps showing snowpack measurement in Idaho | NRCS |
| Snow | SNOTEL Interactive Map - Snow Water Equivalent (Station Conditions) | Interactive map showing daily station snowpack measurement in Idaho | NRCS |
| Weather | Idaho Weather Forecasts | Detailed weather forecasts for Idaho | NOAA |
| Weather | Precipitation Forecasts | Quantitative precipitation forecasts for the United States | NOAA |
| Weather | Northwest Precipitation Outlook | Precipitation forecast updated every six hours | TWC/Intellicast |
Water Supply Committee Meeting Presentations
External Resources
- FSA – Farm Service Agency
- NOAA – National Oceanic and Atmospheric Administration
- NRCS – Idaho Natural Resources Conservation Service
- NWCC – National Water and Climate Center
- NWS – National Weather Service
- USACE – US Army Corps of Engineers
- USBR – US Bureau of Reclamation
- USGS – US Geological Survey
- WRCC – Western Regional Climate Center