Madsen Creek Flood Risk Reduction

Contact Information
Jared McDonald, P.E.
Surface Water Engineer
Renton, WA 98057
This project has been completed.

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 in 2018 by the King County Flood Control District for this project to determine the cause of flooding and present alternatives for improvement.

The City was subsequently awarded a CIP Grant from King County Flood Control Zone District in 2020 to design and construct the minor short-term flood control improvements determined in during the design.

Contract Award Information

The Madsen Creek Flood Risk Reduction Project preliminary investigation and alternatives analysis is funded by the King County Flood Control District Flood Reduction Grant, in the amount of $472,000. The final design and construction is funded through a CIP Grant awarded by the King County Flood Control District in the amount of $615,000.

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 contract was amended December 21, 2020 to include the completion of final design and construction support services in the total amount of $639,776.

The Surface Water Utility solicited bids from contractors in accordance with City policy 252-02. Three bids were submitted on July 25, 2022, and Sierra Pacific Construction, LLC has been selected as the contractor for the project.

On August 22, 2022, Mayor Armondo Pavone executed the construction contract, in the amount of $338,674.21, with Sierra Pacific Construction, LLC.

Project Description

The design phase of the project includes surveying, hydrologic analysis, hydraulic analysis, and environmental analysis to better understand and assess the causes of the flooding problems. This 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. Once the preferred solutions are determined, the first phase will be completed and will include final design and permitting.

The construction phase of the project will include construction of drainage improvements and construction support services.

Project Update

The project is wrapping up construction. All channel excavation, berms, concrete masonry units walls, erosion control protection, hydroseed, and plantings are to be completed by the first week of October. 
Once construction is complete, the City of Renton will perform a punch list with the contractor to ensure that all construction items are completed to a satisfactory level.

We are excited to have this project complete before the winter of 2022/2023 to reduce the flood risk to the surrounding residents.

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