2015 Clarks Creek Elodea Management
The in-water work window for 2015 is June 1-August 1. With a record-setting volume of elodea able to be removed in 2014, and a consideration for the time when the elodea really starts to 'bloom out', the City requested and was granted approval by WDFW and the Puyallup Tribe to begin in-water work on June 1 in an effort to pull the elodea before it hits its massive 'bloom out'.
Clarks Creek In-water ProjectsDASH Removal
Diver-assisted Suction Harvesting (DASH) was identified by the 2012 Elodea Task Force as the main method for elodea removal starting in 2013 onward. In this process, divers enter the water from pontoon-type boats, using surface-supplied air. The divers hand-pull the elodea from the stream, and feed it into a suction hose. The plant material is suctioned to the surface of the water, into mesh bags located on the boat. When several bags are full, they are each transported to the shore, and removed from the project site. This process reduces the fragmentation of the elodea, and completely removes the plant from the stream so it cannot re-plant itself, or grow back.
This process is modeled after similar successful DASH projects in Thurston County, WA and New York.
Permit applications for the 2013-2018 DASH project included:
- Shoreline Substantial Development Permit (City of Puyallup)
- State Environmental Policy Act project review (City of Puyallup)
- Hydraulic Project Approval, HPA (WA Fish & Wildlife)
Also planned for the 2013 project was removal of accumulated rocks under the 56th Street E and Stewart Ave E bridges. It is believed these rocks were pushed into the water over the years by vandals, creating a restriction to the creek flow at those locations. Read more about the 2013 projects here: 2013 Clarks Creek Elodea Management.
Demonstration Sediment Removal Project
This demonstration project was designed to show the potential effectiveness of removing accumulated sediments in a 400-foot stretch of Clarks Creek using a hydraulic dredge method. The demonstration area for the project was identified near the 12th Ave SW bridge. Approximately 400 feet south of the bridge the stream it was previously known to have an existing, natural rock bottom. The project was to begin at this location, working downstream, to expand Salmon-rearing habitat.
Updated - After permits were completed, in-water explorations were completed that discovered the depth extent of sediment in this area. As a result, the demonstration area will be altered in length to adhere to the permit-approved volume for removal. This project was unsuccessfully bid in 2014, but will be out to bid again in 2015 with an extended bid window.
Read more about this project development here: Sediment Removal Demonstration Project.