Madsen Creek Improvement Project Phase 1

Contact Information
Amanda Pierce, P.E.
Surface Water Engineer
Renton, WA 98057

Flooding is a recurring problem in the bottom part of the Madsen Creek drainage basin. Flooding occurs from the Madsen Creek Sediment Basin to SR-169, along the channels roadside of SR-169, 149th Avenue SE and the channel through Ron Regis Park.

The city was awarded a flood reduction grant by the King County Flood Control District for this project.

Contract Award Information

The Surface Water Utility solicited proposals from consultants in accordance with City policy 250-02. All proposals were evaluated and three consultant firms were selected for interviews.  Watershed Science and Engineering, Inc. ranked the highest and was selected to perform this work.

Council awarded the contract to Watershed Science and Engineering, Inc., in the amount of $466,098, at its regular meeting on May 14, 2018.

The Madsen Creek Improvement Project Phase 1 is funded by the King County Flood Control District Flood Reduction Grant, in the amount of $472,000.  

Project Description

The first phase of the project includes surveying, hydrologic and hydraulic analysis and environmental analysis to better understand and assess the causes of the flooding problems. It also includes the identification of short-term and long-term solutions to alleviate the risk of flooding in the affected areas, and the preliminary design of the preferred solution.

Future phases of the project will include final design, permitting and the construction of drainage improvements.

Project Update

An existing conditions assessment and alternatives analysis study was completed in April 2019. The preferred short-term improvements have been identified to mitigate the immediate flooding problem and are currently under preliminary design. Pending receipt of funding from the King County Flood Control District, the design work is anticipated to be completed in spring 2019 with construction of improvements starting in summer 2020 and completed in fall 2020. Long-term improvements are still being evaluated and there is no projected timeframe for their construction.

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