231 miles from Bismarck to Pierre — the longest of the six pools, over the drowned bottomlands of the Standing Rock and Cheyenne River nations.
This lake IS mapped — marine-chart apps carry contours today. We're sourcing an open layer for all six pools (USACE Omaha surveys · state wildlife agencies · USGS ScienceBase). Depths will render against today's pool, not the full-pool number printed on fishing maps.
360°
This lake in 360° — 276 scenes · RM 1,151 →
Oahe Dam, dedicated in 1962, flooded more Native land than any other single public works project in American history: some 160,000 acres of Standing Rock and Cheyenne River bottomland — the timber, game, and shelter that anchored Lakota life through a century of confinement. Families were moved to treeless agency towns on the plains above; the Missouri's sheltering valley simply ceased to exist for them.
The name comes from the Oahe Mission among the Lakota, and the lake now defines the western boundary of both reservations. The 2016-17 water protector gathering at Standing Rock, just below the dam, is the latest chapter of a much older argument about this stretch of river — who bears the costs of what gets built on it, and who is asked for consent.
Terrain360 has captured roughly two-thirds of the mainstem in full 360° imagery. Tap any card to float that stretch in the viewer.