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Libby Dam

17877 Highway 37

Libby, Montana 59923-7828

Libby Dam Office (406) 293-7751 

Kootenai River Levels Recording (406) 293-3421

For Visitor Information contact the Visitor Center (406) 293-5577



Libby Dam

Libby Dam Project is a multi-purpose water resource development.  Its purposes are flood reduction, hydropower, recreation, and environmental stewardship. We recognize that our day to day activities in operating a facility such as Libby Dam have a direct impact on the environment. Our goal is to operate Libby Dam to minimize negative impacts on the environment through pollution prevention and mitigation, and we are committed to continual improvement.  Our commitment is to comply with environmental legislation, rules, and regulations. We encourage environmental stewardship at every level throughout the organization.

Flow Update

Dec. 19, 2014

Current Koocanusa Reservoir elevation: 2,419.2 feet
Current Koocanusa Reservoir inflow: ~5,500 cubic feet per second
Current Libby Dam outflow: 26,500 cfs
Current Kootenai River elevation at Bonners Ferry: 1,755.4 feet

Outflow from Libby Dam will decrease from 26,500 to 16,500 cfs over four hours beginning at 10 p.m. MST tonight.  Outflow will decrease again to 12,000 cfs over four hours beginning at midnight Dec. 21.  Outflow will then increase to 20,000 cfs over three hours beginning at 5 a.m. Dec. 22.  The current plan is to make additional increases in outflow later next week.

Water managers are currently drafting the reservoir to provide flood storage space for next spring.  The April-August inflow forecast is 6.903 million-acre-feet, which is 117 percent of the 1981-2010 average.  This forecast sets the end of December flood risk management elevation to 2,411 feet.

The Northwest River Forecast Center creates daily forecasts for short term projections throughout the Kootenai and Columbia River Basins.  These forecasts may be updated multiple times in a day and as conditions change.  Links to those forecasts can be found below.

Short term forecasts for Libby Dam elevations and inflows:

Short term forecasts for Libby Dam outflow:

Additionally, projected inflows and reservoir operations at Libby Dam through next summer can be found here:

These modeling results are updated at least monthly and include information on elevations, inflow, and outflow:

Page 1 shows Lake Koocanusa elevation probabilities through next summer
Page 2 shows Libby Dam inflow probabilities through next summer
Page 3 shows Libby Dam outflow probabilities through the summer

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