West Interceptor Shorewood Relief


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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

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.

Construction will include 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. Prior to construction of the pipe, a fiber optic cable will be installed on the south side of the tracks. Some tree trimming will take place in March in order to protect trees from construction activities. Excavation for construction of the pipe will begin in late April

The new pipe will be installed in the same location as the existing pipe. The trench will be up to 15 feet deep and 25 to 30 feet wide. Impacts to the construction corridor will include construction activity and noise and temporary bike path detours. No trees on private property will be removed but there will be some permanent tree loss on railroad property.

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.

The third Public Information Meeting will be held on Thursday, March 18 at 5:30 p.m. via Zoom. All interested parties are invited to attend. For questions, contact Eric Hjellen, Madison Metropolitan Sewerage District project manager, erich@madsewer.org or 608-222-1201 ext 348.