Project: Swale Restoration in Canemah Bluff Nature Park

Client: Metro

Location: Oregon City, Oregon

Date: 2015 - 2018

Swale Restoration on Public Land

To preserve and enhance the rich diversity of animal, fish, and plant habitat at Canemah Bluff Nature Park, Metro contracted with Green Banks’ scientists to provide erosion control for a newly-constructed swale system. In order to reduce erosion and improve water quality, we utilized a combination of erosion control techniques such as planting of native vegetation and installation of erosion control fabric, bio-logs, wattles, and willow fascines. On the slopes of the swale, our experts seeded native grasses and herbs, installed erosion fabric, and planted more than 4,000 willows. Several hundred sedge and rush plugs were also installed into the bottom of the swale for improved habitat complexity and plant diversity. Several hundred feet of willow fascines were constructed from willow material harvested nearby. These fascines were installed to reduce the velocity of the surface water and capture sediment, in areas where hillside surface water was causing erosion. We planted more than 10,000 native trees and shrubs on approximately 10 acres of adjacent upland areas and maintained the upland areas by providing seasonal weed control.

Canemah swale in winter before planting.
Canemah swale in spring after planting.
Canemah swale in summer after planting
Green Banks LLC technician installing willow fascines in winter.
Willow fascines blooming in spring.