Boise River Basin Feasibility Study

In partnership with the Idaho Water Resource Board (IWRB), Reclamation is conducting a $6M feasibility study to evaluate increased storage in the reservoirs behind Reclamation’s Anderson Ranch and Arrowrock Dams, and the United States Army Corps of Engineers’ Lucky Peak Dam. IWRB has committed to provide $3M as the non-Federal partner.

Approximately 78% of active capacity in the three reservoirs is contracted for irrigation purposes. The remaining capacity is used for municipal and industrial uses, flow augmentation for endangered species, winter streamflow maintenance, and flood control. The reservoirs are operated as a system to provide flood control, and additional benefits include hydropower and recreation.

Population growth, climate variability, flow augmentation obligations, and increased concern regarding flood risks are driving interest in long-term water supply and flood risk reduction projects.

Related Documents
10/2017 Idaho Water Resource Board Resolution to Commit Funds PDF 442 kb
02/2017 Boise Feasibility Study - Preliminary Hydrologic Evaluation Technical Memorandum PDF 442 kb
02/2009 Modeling Spatial Water Allocation & Hydrologic Externalities in the Boise Valley PDF 1.37 mb
11/2008 A Distributed Parameter Water Budget Data Base for the Lower Boise Valley PDF 6.86 mb
07/2006 Final Boise/Payette Water Storage Assessment Report PDF 9.95 mb


Selena Moore
Study Manager
(208) 383-2207

Bureau of Recamation
Snake River Area Office
230 Collins Road
Boise, Idaho 83702

Last Updated: 5/7/18