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The SE 19th Way protection construction project was completed in October 2018. Following construction, the site was planted with native trees and shrubs. Crews repaired approximately 150 feet of damaged revetment along the Snoqualmie River. The project also included moving a 440-foot section of the road further away from the river. The road provides sole access to one of two remaining large dairies in the Snoqualmie Valley. 

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An aerial image of the Snoqualmie River next to SE 19th Way between Fall City and Carnation.

The view, looking downstream, of the SE 19th Way Road Protection Project on the Snoqualmie River. 

The view, looking downstream, of the SE 19th Way Road Protection Project on the Snoqualmie River.

Overview

Riverbank erosion and flooding damage have occurred along SE 19th Way between Fall City and Carnation, where a revetment is in place to protect this County-owned road. The damage is along the left bank of the Snoqualmie River at river mile 31.55 and extends approximately 150 feet. As a result of the ongoing damage, the revetment has little remaining armor rock at its toe or on its face. The King County Flood Control District plans to repair damages and improve the stability of revetment, thereby reducing the potential for further erosion, which if unchecked could render SE 19th Way impassable.

The project includes two primary elements -- road realignment and revetment repair. For the road realignment, King County proposes to relocate a 440-foot section of road that is threatened by river bank erosion and was damaged by overbank flooding of the Snoqualmie River. The proposal is to move the road landward in compliance with King County road construction standards. For the revetment repair, the slope of the revetment will be repaired with rocks and plants to provide bank stabilization and erosion protection.

Project area

The project is located on SE 19th Way in the lower Snoqualmie Valley, approximately 2.5 river miles downstream of Fall City.

SE_19th_Way_Map

Project goals

  • Repair damages and improve the stability of the revetment, thereby reducing the potential for further erosion, which if unchecked could render SE 19th Way impassable.
  • Reduce the impacts of overtopping of SE 19th Way to the extent practicable.
  • Conduct repair in a manner that minimizes long-term maintenance needs and associated costs.
  • Provide aquatic and riparian habitat benefits to the extent practicable, with a focus on enhancing habitat for listed species and addressing the Snoqualmie Total Maximum Daily Load (TMDL) for temperature.
  • Preserve agricultural practices on properties adjacent to the revetment.

Project timeline

Benchmark Date
Road realignment design complete Summer 2017
Road realignment construction Summer 2018
Revetment repair design complete Spring 2018
Revetment repair construction  Summer-Fall 2018 

Project sponsor

This project is sponsored by the King County Flood Control District.

Project documents

Project documents are available in Adobe Acrobat format. For help using Acrobat files, please visit our Acrobat help page.

For more information about the SE 19th Way Road Protection Revetment Repair, please contact Jay Smith, Project Manager, King County River and Floodplain Management Section, Water and Land Resources Division, Department of Natural Resources and Parks.