Tualatin Basin Water Supply

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Our communities rely on Hagg Lake/Scoggins Dam

The safety, security, and reliability of Hagg Lake/Scoggins Dam is critical to Washington County's community health and water supply.  With the potential future threat of a major earthquake and our growing population, we need to strengthen Scoggins dam to protect the public and meet our community's long-term water needs.

Learn more about the project

Improve dam safety Increase water supply
CONCEPT 1 Existing dam CONCEPT 2 Downstream dam

Options with higher water surfaces impact more land, but will store more water for the community.

CONCEPT 1 Existing dam

CONCEPT 2 Downstream dam

Water Surface Elevation: 303.5 feet
Water Storage Capacity
Legend Dam location Current Full Reservoir New Water Surface
Water Surface Elevation: 315.5 feet
Water Storage Capacity
Legend Dam location Current Full Reservoir New Water Surface
Water Surface Elevation: 272 feet
Water Storage Capacity
Legend Dam location Current Full Reservoir New Water Surface
Water Surface Elevation: 280 feet
Water Storage Capacity
Legend Dam location Current Full Reservoir New Water Surface
Water Surface Elevation: 303.5 feet
Water Storage Capacity
Legend Dam location Current Full Reservoir New Water Surface

Our growing water supply

Key Resources

2016 TBWS Brochure 2012 TBWS Brochure » View all documents

Document archive View past documents, including design and public involvement resources.

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