Harborview Rd & Birch Bay Dr Storm Drainage Improvements

Harborview Road and Birch Bay Drive Storm Drainage Improvements

Construction on this project was initially scheduled for summer 2018. Due to a recent slope failure on Birch Bay Drive near Pt. Whitehorn Road, this project has been rescheduled for construction for the fall of 2020. For more information contact Kevin Thompson, Project Engineer at 360-778-6297.

Project Description
  This project will improve drainage by installing a new 100-year pipe conveyance system along Birch Bay Drive and Harborview Road from the intersection of Birch Bay Lynden Road to a new outfall in Birch Bay.
Project Goals
  1. Improve upland stormwater conveyance to a properly-sized replacement outfall to Birch Bay
  2. Enlarge outfall to eliminate backwater flooding of nearshore drainage system during high tide events
  3. Eliminate/reduce combined tidal and stormwater flooding on road right-of-way and adjacent properties along Birch Bay Drive
   Preliminary design work has been completed and includes a new drainage system layout for the area along Birch Bay Drive from the 8100 block to the intersection with Harborview Road. The Birch Bay Drive system consists of 24" mainline placed in the existing roadway that will convey stormwater collected by a parallel system along the east side of Birch Bay Drive, consisting of catch basins connected to 8" and 12" drain lines. The 24" mainline will connect to the new marine outfall located at the intersection of Birch Bay Drive and Harborview Road. An existing system ,which provides drainage from the Bay Center Market and Windermere Real Estate Office, will be incorporated into the marine outfall.

The Harborview Road improvements include the outfall described above, which will consist of either a 42" pipe connected to a 36" diameter pipe that extends up to the intersection of Birch Bay Lynden Road. The current upland drainage system will be abandoned and the existing upland drainage will be incorporated into the new system. The existing outfall just north of Harborview Road will remain in place during construction but will also be replaced as part of the Birch Bay Drive Pedestrian Facility Project in 2020/2021.