Basin 18C Drainage Improvement
Project Status
To help keep area residents informed of our construction progress, we will post project updates to this site on a regular basis. Click here to see status updates.
Project Details/Neighborhood
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SE 32nd Street and West Mercer Way
Background
Localized ponding can occur during heavy rain events along West Mercer Way, south of SE 32nd Street to the outfall. In addition to localized ponding, the high flow volumes through the pipes can potentially cause scouring of the outfall.
Description
A new catch basin will be installed at the intersection of West Mercer Way and SE 32nd Street and will be used to split the flow at this location. Some of the stormwater entering this new catch basin will be re-routed through a new pipe that will be installed along SE 32nd Street. The re-routed stormwater will flow to a second outfall that has extra capacity. The result will be reduced flow volume in the existing pipes that run along West Mercer Way, reducing ponding and high flows in this pipe.
Project Timeline
Planning/Design (Q2 of 2023 – Q4 of 2023)
Under Construction (Q2 of 2024– Q3 of 2024)
Completed (Q3 of 2024)
Estimated Budget
Planning and Design $33,850
Construction $139,500
Contact
Elayne Grueber, Capital Project Manager, elayne.grueber@mercerisland.gov , cell:206-549-1036
Status Updates
February 2024
City would like to monitor storm flow in pipes before and after project improvements. City Staff are currently working with consultant to evaluate monitoring equipment to install at the project locations for monitoring purposes.
December 2023
The design phase is nearly completed, with the consultant submitting final design plans in December for City staff review.
October 2023
Design is ongoing, with 90 percent completion by the end of October. Construction is expected to begin in Q1/Q2 2024 (following the completion of the watermain improvements along SE 32nd Street).
July 2023
CM Design Group was hired to complete the design work. Design is currently at 60 percent with final plans expected by the end of 2023.
SW0128- Project Location (1 MB)