East Fork Derry Dell Stabilization

Restoration East Fork Derry Dell Stabilization

Project Summary

Stormwater runoff within the East Fork Derry Dell had compromised public utility infrastructure through scour. Evergreen Developers removed hazard trees, dammed and diverted the Derry Dell, installed riffles, runs and beaver dam analogs while ultimately stabilizing 900′ of creek in a developed metropolitan area.

Key Elements

  • Temporary dam and diversion
  • Stream channel excavation
  • Placing streambed materials
  • Beaver Dam Analogs
  • Hazard tree removal

Contracting Agency

City of Tigard

Industry Sector

Ecological Restoration, Stabilization, Infrastructure


Tigard, Oregon