Environmental Services and Portland Parks & Recreation are designing a stream restoration project on three acres of forested land in Dickinson Park in the Fanno Creek watershed. The city purchased the land in 2012 to preserve it as a natural area.
The parcel contains headwaters of two tributaries to South Ash Creek. The work will include removing a spring box, pipes, a foot bridge and other structures and restoring natural stream function.
Project design started in spring 2016. Over the coming year, city and contract staff will occasionally be on the site for survey, design, and environmental assessments. Environmental Services will begin construction in summer 2017.
There are 650 feet of open stream channel and the headwaters of two tributaries to South Ash Creek on the work site. Small, intact headwater streams naturally help control flooding, recharge groundwater, trap sediments and pollution, recycle nutrients, and provide habitat. Summer flows from the streams sustain fish and wildlife downstream.
The project will:
- Remove a pipe and restore about 68 feet of stream to provide natural function and stabilize streambanks
- Create wetland and floodplain benches next to the stream channel
- Remove a pump house, footbridge, pipes and other structures to restore natural stream processes and function
- Connect the stream to the floodplain and protect the stream channel
- Plant native shrubs and trees to keep the stream cool and provide wildlife habitat
Environmental Services Watershed Revegetation Program worked at the site in February 2015, planting 3,000 tree and shrub seedlings. Better stream function and floodplain interaction will improve aquatic habitat, protect the streambed and banks from erosion, and improve water quality.
For More Information
Contact Lisa Moscinski, 503-823-3663