US Army Corps of Engineers
Northwestern Division

Duncan Dam

Duncan Dam and Duncan Lake

Published Sept. 29, 2015
Duncan Dam Construction began September 17, 1964 and storage became fully operational July 31, 1967.

Reservoir Elevations

  • Normal full pool: 577 meters (1,892 feet)
  • Normal minimum pool: 547 meters (1,794.2 feet)
  • Surface area at full pool: 7,290 hectares (18,000 acres)
  • Total storage capacity: 1.77 kilometers3 (1,432,400 acre-feet)
  • Usable storage capacity: 1.73 kilometers3 (1,400,000 acre-feet)
  • Treaty storage commitment: 1.73 kilometers3 (1,400,000 acre-feet)

Dam, Earthfill

  • Crest elevation: 581 meters (1,907 feet)
  • Length: 792.5 meters (2,600 feet)
  • Approximate height above riverbed: 39.6 meters (130 feet)
  • Maximum spillway capacity: 1,350 meters3/sec (47,700 cfs)
  • Maximum discharge tunnels capacity: 570 meters3/sec (20,000 cfs)

Power Facilities

  • None

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