Partnering for Idaho: Federal Agencies Align Missions at Anderson Ranch Dam
High in the mountains east of Boise, Anderson Ranch Dam stands as one of Idaho's critical water infrastructure assets. The BOR-operated multipurpose facility provides irrigation water, hydroelectric power and flood risk management across the region.
The on-site discussions linked Reclamation’s project planning with USACE’s regulatory responsibilities and the site conditions critical to water-storage planning.
“Our goal here is to build strong collaboration between both agencies,” said Lt. Col. Douglas D. Droesch, commander of the Walla Walla District. “Early coordination streamlines communication and ensures the project is completed safely, efficiently and with the public’s best interest at the forefront.”
The visit spotlighted a vital Walla Walla District mission that is often less visible than operating locks, dams and recreation areas: administering the federal regulatory mission throughout Idaho.
Through this program, USACE administers Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act. Regulatory project managers evaluate proposed activities affecting waters of the United States and navigable waters, balancing reasonable development with aquatic resources protection through objective, and transparent permit evaluations.
At Anderson Ranch, that mission directly intersects with Reclamation's infrastructure initiatives. The dam currently holds a total storage capacity of 474,900 acre-feet. BOR, in partnership with the Idaho Water Resource Board, is evaluating a 6-foot dam raise that would add approximately 29,000 acre-feet of reservoir storage space.
“This project is a unique opportunity to increase storage on the Boise River system,” said Chris Keith, a project manager for BOR. “The additional water from increased storage will benefit irrigation and communities downstream.”
The Boise River reservoir system includes Anderson Ranch, Arrowrock and Lucky Peak reservoirs. Lucky Peak is operated by the Walla Walla District, while Anderson Ranch and Arrowrock are BOR-managed facilities. During the flood risk management season - typically January through July – the two agencies jointly operate the system. Using runoff forecasts and snowpack data, teams determine required reservoir flood space and coordinate water releases, illustrating how federal missions converge across an entire watershed.
For the district’s Regulatory Division, early coordination on large-scale civil works projects helps both agencies pinpoint where their respective authorities intersect, identify potential aquatic resource impacts and clarify regulatory requirements before decisions or construction occurs. This coordination does not eliminate each agency's distinct responsibilities. Instead, it ensures technical expertise and regulatory standards shape the project from inception.
“Under guidance from the Clean Water Act and NEPA, we seek to allow for sustainable development while avoiding, or minimizing, the environmental impacts,” said Benjamin Wilson, a regulatory project manager for USACE’s Albuquerque District, who is collaborating with the Walla Walla District on this permit.
USACE policy places a premium on interagency collaboration, emphasizing that early engagements reduces schedule and environmental risks. Across Idaho, Walla Walla District personnel deliver on this commitment daily through regulatory permitting, flood risk management, emergency disaster response and water resources infrastructure operations.
"The public does not experience our missions as separate agencies or authorities," Droesch said. "They experience the outcome. Our responsibility is to understand where our work intersects, coordinate early and make sure we deliver for the communities we serve."
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