The Locks and Dams in Seattle District

Seattle District Locks and Dams

Flood Risk Management

Seattle District plans, designs, constructs, operates and maintains flood risk management projects, and provides flood plain management services. Mud Mountain Dam on the White River and Howard Hanson Dam on the Green River are two Corps flood risk management dams located in western Washington. Libby Dam on the Kootenai River in western Montana and Albeni Falls Dam on the Pend Oreille River in northern Idaho also provide flood risk management benefits.


The Seattle District operates and maintains three hydropower projects. Albeni Falls Dam, Libby Dam and Chief Joseph Dam on the Columbia River system produce 3,025 megawatts of electricity—more than enough to power a city the size of Seattle.


The U.S. Army Corps of Engineers is the largest provider of water-based outdoor recreation in the nation. Its 422 lake and river projects in 43 states provide a diverse range of recreational opportunities. Visitors of all ages can enjoy traditional activities like hiking, boating, fishing, camping and hunting, and for those slightly more adventurous there is snorkeling, windsurfing, whitewater rafting, mountain biking and geo-caching.


Recreation Program Statistics

The U.S. Army Corps of Engineers (USACE) is one of the nation’s leading federal providers of outdoor recreation with more than 400 lake and river projects in 43 states. Our recreation program provides quality outdoor public recreation experiences to serve the needs of present and future generations and contributes to the quality of American life, while managing and conserving natural resources consistent with ecosystem management principles.

• Visits per year: 250 million

• Number of recreation sites: 5,041 at 403 USACE Projects (2,839 USACE-operated; 2,202 operated by others)

• Percentage of USACE lakes/rivers with recreation sites within 50 miles of a metropolitan area: 90%

• Acres of recreation lands and waters: 12 million in 43 states

• Miles of shoreline: 55,390

• Number of campsites: 93,101

• Miles of trails: 7,892

• Number of picnic sites: 36,449

• Number of boat ramps: 3,748

• Share of all U.S. freshwater fishing: 18%

• Fishing tournaments per year: 3,000

• Marina concessionaires on USACE projects: 562 marinas

• Visitor spending on trips to USACE projects: $10.7 billion

• Total jobs supported by visitor trip spending: 180,000

• Volunteers at USACE projects: 45,104 volunteers provided 1.56 million hours of service

• National Public Lands Day participation: 280 miles of shoreline cleaned, 60,000 pounds of trash collected & 450 tires removed

For more on USACE recreation sites and opportunities, visit us at - Corps Lakes Gateway (

(Statistics as of May 2017)