Anderson Ranch Dam Water Supply Study

Anderson Ranch Dam

Water users in the Boise Valley and the surrounding area continue to express interest for increased water supply storage. Today, all but 17 percent of the water captured in the Boise River basin is contracted for irrigation use. Water not contracted for irrigation is used for salmon flow augmentation, domestic, commercial, municipal and industrial (DCM&I) uses, and winter streamflow maintenance. The reservoir system also provides hydroelectric power generation, flood control, recreation, and fish and wildlife benefits. Population growth, climate variability, salmon flow augmentation obligations, and increased concern for flood risks have led to increased interest in long term water supply and flood risk reduction projects as water management tools for the future.

In 2006, Reclamation completed the Payette/Boise River Basins Water Supply Assessment Study (2006 study). The Idaho Water Resources Board (IWRB), Idaho Water Users Association (IWUA) and others supported legislation to provide Reclamation with feasibility study authority to continue this work. In 2009, P.L. 111-11 provided Reclamation with feasibility study authority in the Boise River and Payette River basins to further pursue the opportunities identified in the 2006 Study, one of which was raising Anderson Ranch Dam.

The Reclamation’s Snake River Area Office will host a interested party meeting on April 30, 2015 from 9:00 a.m. to 11:30 a.m. in the main lobby conference room to determine the level of interest in raising Anderson Ranch Dam. At least one-half of the study costs must be shared by non-Federal partners so Reclamation is also seeking funding partners.

Related Documents
11/2016 Boise System Feasibility Study Draft Expanded Scope of Work PDF 442 kb
05/2016 Anderson Ranch Dam Raise Informational Meeting Powerpoint PDF 8.10 mb
04/2016 Anderson Ranch Dam Raise Preliminary Hydrologic Evaluation Technical Memorandum PDF 823 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
11/2005 Boise and Payette River Basins: Literature Report for Potential Water Storage Opportunities PDF 11.93 mb
02/2005 Hydrologic Analysis of the Refill Probabilities Associated with Increasing the Storage Capacities of Anderson Ranch and Arrowrock Reservoirs PDF 125 kb
04/2015 Anderson Ranch Dam Feasibility Study Proposal PDF 1004 kb


Selena Moore
Study Manager
(208) 383-2207

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

Last Updated: 12/6/16