Current Projects: West Interceptor Shorewood Relief

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Project overview

Madison Metropolitan Sewerage District’s West Intercepting System is a complex network of sewers that provides service to the near west side of Madison, Middleton, Shorewood Hills and Westport. The original West Interceptor was built in 1916, and there have been several extensions, reliefs and replacements added to the system over the years. The existing interceptor needs to be replaced to increase capacity, which ensures the safe and reliable conveyance of wastewater while protecting public health and the environment.

Phase 1

The District has bid and awarded a contract to construct Phase 1 of the West Interceptor Shorewood Relief pipe. This project will replace a pipe installed in 1959 that no longer has sufficient capacity to serve the District's growing service area. The new pipe will be laid on the north side of the railroad tracks from Indian Hills Park to Shorewood Boulevard. Sewage flow is from west to east (Indian Hills Park toward Shorewood Boulevard) but construction will proceed in the opposite direction, from east to west. Construction includes tree removals, trench excavation, and placement of the pipe and manholes. The average depth of the pipe is approximately 10 feet below the ground surface.

Construction is approximately two-thirds complete as of November 2021. Pipe has been installed on the north side of the railroad tracks from Shorewood Boulevard to approximately the midpoint of the south property line of the Blackhawk Country Club (the golf course). Due to supply chain issues, the contractor ran out of pipe and pulled off the project in November. Construction will begin again on December 6, 2021.

At that time, the section of the bike path from Indian Hills Park to the railroad crossing will be closed for approximately six weeks. During this closure, the detour route will cross University Avenue and use Whitney Way and Old Middleton Road to reconnect with the path.

Construction will proceed from the golf course west to Indian Hills Park. When pipe construction has progressed into Indian Hills Park, the detour route will be changed. A section of the path at the railroad crossing will be temporarily restored to give access to the new detour route along Flambeau Road.

Completion of the Phase 1 pipe installation is expected in March 2022. Site restoration will take place in Spring 2022. This will include permanent restoration of the bike path.

Future phases

Phase 2 of the project will be constructed in 2022 in coordination with the City of Madison University Avenue project. Phase 2 will run in University Avenue from Marshall Court to Highland Avenue. Phase 3, which runs in the bike path from Shorewood Boulevard to Marshall Court, will be constructed in 2023.

Public involvement

The District held three public information meetings for phase 1 of this project

Postcards with information about the project and virtual meetings were sent to residents in the project area.

Project details

Project Type:

Construction, Sewer Replacement


Phase 1: North side of railroad tracks from Indian Hills Park to Shorewood Boulevard University Avenue from Marshall Court to Highland Avenue

Phase 2: University Avenue from Marshall Court to Highland Avenue

Phase 3: Bike path from Shorewood Boulevard to Marshall Court




Phase 1: April 2021-January 2022

Phase 2: 2022; the City of Madison is leading this phase of the project.

Phase 3: 2023


Phase 1 nearly complete

Project Contact:

Eric Hjellen
608-222-1201 x348

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