Sub Basin 32b Conveyance Upgrades
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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Along SE 72nd Street, east of West Mercer Way
Background
Computer modeling was completed to investigate potential capacity issues for the storm drainage system. The modeling confirmed that the current 18-inch storm pipe is undersized and does not have capacity for high intensity, short duration storm events. During such events, there is a potential for minor localized street ponding.
Description
Construct an 18-inch storm pipe parallel to the existing pipe along SE 72nd Street to increase system capacity. Catch basins will be added at the intersection of SE 72nd Street and West Mercer Way to improve collection of roadway runoff.
Project Timeline
Planning/Design: 2026
Construction: 2027
Contact
Elayne Grueber, P.E., Capital Project Manager, elayne.grueber@mercerisland.gov
Status Updates
May 30, 2024
The stormwater improvements proposed for this project are being paused. For cost savings, the City is planning to combine storm improvements along SE 72nd Street with future watermain and road improvements proposed for the neighborhood in 2027.
February 2024
City Staff are reviewing design.
December 2023
The design phase is nearly completed, with the consultant submitting final design plans in December for City staff review.
October 2023
The 90 percent design is expected by the end of October.
SW0130 Project Location (402 KB)