Future Water Source Projects

Tualatin Basin Water Supply Project

Water resources agencies in Washington County are working to ensure clean, safe, and reliable water supplies for the environment and needs of a growing community. They have formed a water supply partnership to finance and plan for future water supplies from the Tualatin River. The Tualatin Basin Water Supply Project partners include:

The project also operates in partnership with the U.S. Bureau of Reclamation (USBR). The USBR is the builder and owner of the Scoggins Dam and Hagg Lake.

Beaverton's Involvement

Beaverton’s current level of participation in the Tualatin Basin Water Supply Project is 1,763 acre-feet (574 million gallons of storage) or 3.33% of the total nominal 52,900-acre-feet of new raw water storage that would be created in an expanded Scoggins Dam with a 40-foot dam raise. The Scoggins Reservoir expansion would nearly double the current volume of the reservoir totaling 60,640 acre-feet (usable volume 53,640 acre-feet).

Beaverton currently owns a right to use up to 4,000 acre-feet in Hagg Lake and 4,300 acre-feet in Barney Reservoir for summertime water supply. During the summer, water in the two reservoirs is released into the Tualatin River as needed to meet the City’s potable (drinking) water demand. The City of Beaverton acquired rights to its 4,000 acre-feet of water in Scoggins Reservoir (Hagg Lake), referred to as the Tualatin Project, under two separate contracts with the U.S. Department of the Interior Bureau of Reclamation.

Additional Information

Potential future drinking water sources