July 23, 2015
Current Koocanusa Reservoir elevation: 2,443.65 feet
Current Koocanusa Reservoir inflow: ~7,500 cubic feet per second
Current Libby Dam outflow: 9,000 cfs
Current Kootenai River elevation at Bonners Ferry: 1,747.13 feet
Outflow from Libby Dam will decrease from 9,000 to 8,000 cfs over two hours beginning at 11 p.m. tonight. It will be further reduced to 7,500 cfs at 11 p.m. July 24. The rampdown in outflow is being spread over two night to reduce impacts to instream habitat. Water managers are reducing outflow to reach an end-of-September elevation target of 2,439 feet.
Previous projections showed a stable pool in September, so the intent was to end August with full draft to 2,439 feet achieved. Current inflow forecasts indicate that the pool will continue to draft while releasing 6,000 cfs during September. To accommodate this draft, the end of August elevation will be approximately 2,441.5 feet. Water managers will continue monitoring reservoir and river conditions and make adjustments to the outflow throughout the summer as necessary to reach the end of September target.
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 the summer
Page 2 shows Libby Dam outflow probabilities through the summer
Page 3 shows Lake Koocanusa elevation probabilities for a given date
Page 4 shows Bonners Ferry stage probabilities through the summer
Page 5 shows Bonners Ferry maximum stage probabilities for the year
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