Lahti Drive/Britton Road Bio-Infiltration Swale

Project Overview
This project, located at the southeast corner of Britton Road and Lahti Drive, targets treatment of stormwater flows draining to Lake Whatcom via Silver Beach Creek. Stormwater drainage into Silver Beach Creek has a long record of high phosphorus and fecal coliform bacteria measurements. The Creek also suffers from substantial bank erosion. This project is downstream of a densely populated, 40-acre subdivision making stormwater treatment especially effective. Stormwater from the subdivision will now flow through a vegetated swale made up of eight treatment cells designed to remove contaminants by infiltration, soil adsorption, and plant uptake. Special soil in the treatment cells targets phosphorus removal from stormwater before it enters Lake Whatcom. The project was completed below budget at the end of September 2010.

The Lahti Drive Stormwater Improvement Project is the first of several improvements that Whatcom County Public Works will construct in the Silver Beach Creek sub-basin. This work is part of a coordinated effort by Whatcom County, the City of Bellingham, and the Lake Whatcom Water and Sewer District to improve water quality in Lake Whatcom. Part of the funding for this project came from a Stormwater Retrofit and Low-Impact Development Grant from the Department of Ecology.

Project Details
  • Jurisdiction: Whatcom County
  • Contractor: Len Honcoop Gravel Inc.
  • Final Construction Cost: $180,000
  • Completion Date: September 30, 2010
Project Area
The Lahti Drive/Britton Road Bio-Infiltration Swale is located in the Silver Beach neighborhood.

Project Manager
Kirk Christensen, P.E.
Stormwater Manager
Whatcom County
Phone: (360) 778-6297

Project Map

Bank erosion in the drainage next to Britton Rd
Corner of Lahti Drive and Britton Road
Corner of Lahti Drive and Britton Road