Scoggins Dam seismic studies require lane closure at Hagg Lake

For Immediate Release: Friday, August 05, 2016

Lane closure extended one week to Aug. 26
UPDATED: 08/05/2016
Sponsored by: Department of Land Use and Transportation, Operations and Maintenance Division

Delays in Bureau of Reclamation's seismic drilling activities are requiring a one-week extension of the lane closure on West Shore Drive across Scoggins Dam through August 26. The original plan was to reopen two-way traffic on August 19.

All road users are reminded to obey traffic control signs during this necessary seismic testing of Scoggins Dam.


Original release: 06/01/16

Scoggins Dam lane closure 2016The northbound lane of West Shore Drive across Scoggins Dam will be closed starting June 13. Only southbound one-way traffic will be allowed across the dam while the U.S. Bureau of Reclamation conducts seismic testing.

West Shore Drive across the dam will be open to two-way traffic for the Fourth of July holiday week. The lane closure will be removed July 1 through July 10. The estimated completion date is August 19. 

During the lane closure, travelers will turn onto West Shore Drive from Scoggins Valley Road to reach the west side of Hagg Lake. To leave the park from C-Ramp and other recreation areas on the west side of the lake, travelers will follow West Shore Drive north to Scoggins Valley Road and then continue south on Scoggins Valley Road to the park exit. 

The lane closure impacts all road users – motorists, bicyclists and pedestrians. 

This work was scheduled to create as little inconvenience as possible to park users and planned events. Every effort will be made to complete the work as quickly and safely as possible. 

This schedule may change. Check for current schedule information. 


Reclamation began drilling at Scoggins Dam in April. Drilling crews are collecting soil samples from the embankment and foundation to refine ongoing Scoggins Dam studies for seismic stability.  

Scoggins Dam, built in 1978, is part of Reclamation's Tualatin River Project. It is the central component of Washington County's water supply.  

Scoggins Valley Park/Henry Hagg Lake is maintained and operated by Washington County. The park is a popular recreation destination, hosting nearly 1 million visitors annually.

Washington County is committed to planning, building and maintaining a great transportation system, ensuring the safety of all roadway users, and operating the County roadway system in a cost-effective and environmentally responsible manner.

Media Contact:

Melissa De Lyser, Communications Coordinator