The Missouri River Flood of 2011: A North Dakota Perspective

Abstract:

The Missouri River flood of 2011 resulted in hydrological conditions not experienced in North Dakota since Garrison Dam was closed in 1953.  Lakes Sakakawea and Oahe reached record levels and the 150,000 cfs releases from Garrison Dam were two-times higher than the previous record of 1997.  Habitat, biota, and recreational infrastructure, including Garrison Dam National Fish Hatchery, were affected by these record flows.  Extensive habitat changes occurred on both the reservoir and riverine portions of the Missouri River within the state.  Unique movements of many fish species occurred throughout the system, with entrainment thru Garrison Dam being most notable.  Entrainment of virtually all species occurred in 2011, but most concerning were high numbers of paddlefish and rainbow smelt lost thru the dam during the late summer period.  High river levels caused extensive damage to recreation and access sites along the Garrison Reach of the Missouri River and largely eliminated angling throughout much of the year.  The cumulative impacts of the 2011 flood will not be known for many years and assessment of the habitat, biota and infrastructure are ongoing.  This presentation will primarily focus on observations from the 2011 flood and speculation on future conditions. 

Student presenter?  No