Columbia River Treaty: Permanent Engineering Board

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Duncan Dam and Duncan Lake
Project Statistics

Storage Project  
Construction began 17 September 1964
Storage became fully operational 31 July 1967
Normal full pool elevation 577 m (1,892 feet)
Normal minimum pool elevation 547 m (1,794.2 feet)
Surface area at full pool 7,290 hectares (18,000 acres)
Total storage capacity 1.77 km3 (1,432,400 acre-feet)
Usable storage capacity 1.73 km3 (1,400,000 acre-feet)
Treaty storage commitment 1.73 km3 (1,400,000 acre-feet)
Dam, Earthfill  
Crest Elevation 581 m (1,907 feet)
Length 792.5 m (2,600 feet)
Approximate height above riverbed 39.6 m (130 feet)
Spillway - Maximum capacity 1,350 m3/sec (47,700 cfs)
Discharge tunnels - Maximum capacity 570 m3/sec (20,000 cfs)
Power Facilities  
Website Contact: U.S. Army Corps of Engineers Columbia Basin Water Management