BIGHORN LAKE SEDIMENT MANAGEMENT STUDY FINAL REPORT March 2010 ————————————————————————————————— Bighorn Lake, Horseshoe Bend ACKNOWLEDGEMENTS The “Bighorn Lake Sediment Management Study” was completed by the Omaha District Corps of Engineers, Hydrologic Engineering Branch, Sedimentation and Channel Stabilization Section for the Bureau of Reclamation, Great Plains Region, Montana Area Office. Work was performed under Interagency Agreement No. 07AA602252. Partial funding for this study was furnished by the National Park Service. Agency Representatives USACE John Remus Dan Pridal, Chief Chief, Hydrologic Engineering Branch Sedimentation and Channel Stabilization Section Omaha District Omaha District 1616 Capitol Avenue 1616 Capitol Avenue Omaha, Nebraska 68102-1618 Omaha, Nebraska 68102-1618 Phone No.: 402-995-2349 Phone No.: 402-995-2336 e-mail:
[email protected] e-mail:
[email protected] Reclamation Stephanie Hellekson Montana Area Office P.O. Box 30137 Billings, MT 59107-0137 Phone No.: 406.247.7306 e-mail:
[email protected] National Park Service John Keck Wyoming-Montana State Coordinator at National Park Service; Wyoming/Montana State Coordinator - Acting Assistant Superintendent, Bighorn Canyon NRA at National Park Service 5353 Yellowstone Road Cheyenne, Wyoming 82001 Phone: (307)-775-6102 Email:
[email protected] i Executive Summary Bighorn Lake was created when the Bureau of Reclamation constructed Yellowtail Dam across the Bighorn River in the 1960s. Since dam closure, sediments have accumulated within the pool area and are impacting lake resources. A reconnaissance level technical study was conducted to evaluate several sediment management alternatives. The study used existing cross section, hydrologic, and sediment data for the reservoir as input to a one-dimensional sediment transport model.