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TREATY PROJECTS

Libby Dam and Lake Koocanusa
Project Statistics

Storage Project  
 
Construction began June 1965
 
Storage became fully operational 17 April 1973
 
Reservoir  
 
Normal full pool elevation 749.5 m (2,459 feet)
Normal minimum pool elevation 697.0 m (2,287 feet)
Surface area at full pool 18,830 hectares (46,500 acres)
Total storage capacity 7.2 km3 (5,869,000 acre-feet)
Usable storage capacity 6.1 km3 (4,980,000 acre-feet)
 
Dam, Concrete Gravity  
 
Deck Elevation 753.5 m (2,472 feet)
Length 916.0 m (3,055 feet)
Approximate height above foundation 112.8 m (370 feet)
Spillway - Maximum capacity 4,106 m3/sec (145,000 cfs)
Low level outlets - Maximum capacity 1,730 m3/sec (61,000 cfs)
 
Power Facilities  
 
Designed ultimate installation  
8 units at 105 MW 840 MW
Currently installed  
5 units at 120 MW 600 MW
Power commercially available 24 August 1975
Head at full pool 107.0 m (352 feet)
Maximum turbine discharge  
of 5 units at full pool 745.6 m3/sec (26,500 cfs)
Website Contact: U.S. Army Corps of Engineers Columbia Basin Water Management