Anderson Ranch Dam Raise

Milestones

Key Critical Path Milestones
Spring 2026 Complete final designs for Dam Raise and Reservoir Rim Projects
2026 / 2027 Complete environmental compliance
Completed Key Milestones
December 2024 Completed Reservoir Rim Projects 90% designs.
November 2024 Completed: Dam Raise Geotechnical Field Explorations Report, potential hazardous materials site-survey report, initial plan for reservoir operations during construction, and the Reclamation / US Forest Service concurrence document for how accessibility requirements will be incorporated into reservoir rim projects designs.
June 2024 Completed Reservoir Rim Projects Geotechnical Field Explorations Report.
May 2024 Completed Dam Raise 60% Design.
Jan. / Feb. 2024 Completed Reservoir Rim Projects 60% designs and Constructability Review.
November 2023 Completed on-site field explorations.
June 2023 Completed Dam Raise and Reservoir Rim Projects 30% design reviews, Value Engineering Studies, and Dam Raise Constructability Review.
May 2023 Completed Dam Raise and Reservoir Rim Projects 30% Designs.
September 2022 Received total non-federal project funding based on the feasibility level total project cost estimate.
September 2022 Reclamation’s risk neutrality and construction risk analysis, Dam Safety Advisory Team review and concurrence.
June 2022 Reclamation’s TSC completed dam spillway overlay feasibility design and conducted risk neutrality and construction risk workshop.
November 2021 IWRB and Reclamation signed and executed cost-share contract. IWRB provided first interval payment of advanced funds. TSC initiated final design activities.
Sept. / Oct. 2021 Reclamation and IWRB completed cost-share contract negotiation sessions: Sept. 22, Oct. 5, Oct. 19, and Oct. 28.
July / August 2021 Reclamation’s Columbia-Pacific Northwest Region requested delegation of authority and received approval from the Commissioner to negotiate, execute, and administer a cost-share agreement pursuant to section 4007 of the WIIN Act with the IWRB.
May 2021 Initiated pause in the environmental compliance process pending further development of final design.
December 2020 Fiscal Year 2021 appropriations legislation secured $12.88 million in WIIN Act funding for completing the study, environmental compliance, and construction.
December 2020 Reclamation transmitted the final Feasibility Report to Congress.
December 2020 The Secretary of the Interior determined the Study’s recommended plan to be feasible in accordance with the WIIN Act.
July 31, 2020 Reclamation released the draft environmental impact statement and draft feasibility report.
April 6-10, 2020 Reclamation completed the peer review of the Water Operations Technical Memorandum.
February 3-7, 2020 Reclamation completed the design, estimate, and construction review of the feasibility level designs.
August 27-29, 2019 Reclamation conducted public scoping open houses in Pine, Boise, and Mountain Home, Idaho.
August 9, 2019 Reclamation published the notice of intent for an environmental impact statement in the Federal Register.
June 19, 2019 Reclamation’s Technical Service Center completed feasibility-level design and cost estimates for the Anderson Ranch Dam raise.
June 7, 2019 IWRB filed a water right permit application for the potential additional storage (Water Right No. 63-34753).
April 30, 2019 Consultant submitted land, structure, infrastructure, and real estate impact assessment (rim analysis) for Anderson Ranch Reservoir.
December 25, 2018 Reclamation awarded an indefinite delivery / indefinite quality contract for architect and engineering services to Sundance-EA joint venture to complete the study and environmental compliance activities.
December 3-7, 2018 Reclamation conducted a value planning study and received a final accountability report in February 2019.
November 8, 2018 Reclamation and IWRB hosted an informational public open house in Boise, Idaho.
August 28, 2018 Reclamation and IWRB hosted a legislative infrastructure tour to discuss large water infrastructure projects in Idaho with representatives from Idaho’s congressional delegation.
July 27, 2018 IWRB passed a resolution supporting narrowing the focus of the Study to a raise at Anderson Ranch Dam.
Nov. 2017 – Jan. 2019 Reclamation completed initial screening of the three potential dam raise alternatives and developed a project management plan.
Anderson Ranch Dam Raise

Contact

Chris Keith
Project Manager
(208) 378-5360
ckeith@usbr.gov

Bureau of Recamation
Regional Office
1150 N. Curtis Road
Boise, Idaho 83706

Last Updated: 7/22/25