About the project
The Tualatin Basin Water Supply Project Partnership was authorized by Congress in 2004 to design and secure Washington County's water supply, respond to anticipated climate change and drought cycles, and meet the 50 year supply needs for water quality and critical habitat improvements in the Tualatin Basin.
Scoggins Dam is the central component of Washington County’s water supply and a major regional asset. It uses water from Hagg Lake to support more than 250,000 jobs, provide drinking water for nearly 400,000 residents, irrigate 17,000 acres of cropland, and sustain water quality in the Tualatin River to protect fish and wildlife habitats
Currently, Clean Water Services (CWS) and the Bureau of Reclamation (Reclamation) are partnering to preliminarily address the seismically at-risk dam and how to potentially develop additional future water supplies for Scoggins Dam. The partnership between the agencies, the first of its kind in the country, is developing a more detailed understanding of various options. This is called the Tualatin Basin Dam Safety and Water Supply Joint Project – or, “Tualatin Basin Joint Project” for short.