Boise River Basin Feasibility Study

USACE Dams in the Study
Lucky Peak Dam
Reclamation Dams in the Study
Anderson Ranch Dam
Arrowrock Dam

Transcript PDF 139 kb

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.

Based on results from initial data collection and screening efforts, Reclamation and IWRB have agreed to focus the study on increased storage behind Anderson Ranch Dam at this time since its relatively low complexity will allow for completion by the Water Infrastructure Improvements for the Nation (WIIN) Act deadline of January 1, 2021, and it is projected to provide the most water for the investment.

Reclamation and IWRB are hosting an Open House on Thursday, November 8, 2018 from 6:00pm to 7:30pm to share early-stage information about the feasibility study for increasing water storage capacity within the Boise River system, particularly at Anderson Ranch Dam. The Open House will be held at Wyndham Garden Inn Boise Airport, 3300 S. Vista Avenue, Boise, ID 83705. A short introductory presentation will begin promptly at 6:00 p.m. Staff will be available for conversations throughout the evening.

If you would like to be added to or be removed from the mailing list to be contacted about future meetings, update your contact information, or if you have questions, comments, or feedback regarding the Boise River Basin Feasibility Study, please contact us at

Related Documents
11/2018 Boise River Basin Feasibility Study Frequently Asked Questions (FAQs) PDF 54 kb
10/2018 Boise River Basin Feasibility Study Open House Information PDF 358 kb
07/2018 Idaho Water Resource Board Resolution to Prioritize Analysis of Feasibility of Raise at Anderson Ranch Dam PDF 829 kb
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: 12/18/18