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I-90 Stormwater

Project Number: 2018052

Status: Design

Project Timeline

Construction Start Date: Estimated summer 2026

Construction Completion Date: Estimated fall/winter 2026

Project Description

This project will install a subsurface stormwater treatment and infiltration facility for stormwater generated on an approximately 8-acre section of Interstate 90 (I-90). The project will have a lift station, below grade modular wetland system, and infiltration gallery that will treat and infiltrate stormwater runoff.

Key Objectives

Improve Water Quality: Reduce risk of an overflow event at the combined sewer overflow (CSO) 34 via stormwater separation of mainline I-90.

Construction Estimate: $5.9 million

Contact Information

For questions or concerns regarding the construction work or the construction schedule, please contact the contractor’s public representative.

Contractor Public Representative

City Construction Relations Manager
Annie Deasy, 509.625.6102

City Project Manager – Design Phase
Kristy Warren, 509.625.6548

City Project Manager – Construction Phase

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