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City of Lake Oswego
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Iron Mountain Sanitary Sewer & Pedestrian Bridge

Project Background/Summary

The Iron Mountain Sanitary Sewer Bridge carries a wastewater transmission line through Tryon Creek State Park. The bridge is nearing the end of its useful life and needs rehabilitation or replacement. The Oregon State Parks Department may be willing to contribute up to $50,000 towards the project as the bridge also carries pedestrian traffic for park visitors. The bridge needs repair to remain open to pedestrian traffic. 

If you would like more information about this project, please contact Matthew Tipton, PE Associate Engineer at email.


August 5, 2016

The Iron Mountain Bridge will be closing for construction beginning August 15th and will remain closed until completion in November. The Iron Mountain Trail will be closed from the trailhead at Terwilliger to the south end of the Iron Mountain Bridge (intersection of the South Creek Trail and Iron Mountain Trail).

Construction will include rehabilitation of the sanitary sewer main attached to the bridge. The concrete main will be replaced by a joint less high density polyethylene line in a steel casing.

June 22, 2016

The project is scheduled to begin around July 15, 2016 and will continue until October 2016.

City of Lake Oswego Oregon Official Website
New Iron Mountain Bridge


WO 163


Capital Improvement Projects

Contact Us

Matthew Tipton, PE, Associate Engineer (503) 675-2533