Nine Springs Valley Interceptor Improvements - McKee Road to Dunn's Marsh

Construction 12/2020 to 12/2021

Madison Metropolitan Sewerage District is replacing the existing interceptor along the Military Ridge Path and Cannonball Path between McKee Road and Seminole Highway. This project, known as Nine Springs Valley Interceptor Improvements - McKee Road to Dunn's Marsh, will protect public health by replacing deteriorated infrastructure and increase capacity to serve growing communities.

An interceptor is the largest component of a sewer network. It receives flow from small sewer lines and directs sewage to the wastewater treatment plant. The portion of the interceptor that will be replaced in this project was built in 1965 and serves the City of Madison, the City of Fitchburg, the City of Verona, and the City of Middleton.

Following a comprehensive analysis with consultant MSA Professional Services, Inc., the District has chosen to build a new interceptor to replace the existing, spanning approximately 4,200 lineal feet. Work is anticipated to begin December 7, 2020 and be complete December 2021.

As the majority of the interceptor runs adjacent to or under the Military Ridge and Cannonball paths, the project includes restoration of the trails as well as other trail improvements. These improvements include new lighting at Velo UnderRound roundabout and additional signage for trail amenities. In select areas, the project will also remove invasive species for restoration of native species. The project also avoids disturbing local wetlands to the maximum extent possible.

Detours for the Military Ridge Path and Cannonball Path are planned to start Monday, Dec. 7, 2020. Portions of these paths, including the Velo UnderGround, will be closed during the project. Additionally, a portion of the Capital City Trail will be closed June 7 to June 28, 2021 for a local sewer connection, including pavement replacement. See the detour map for revised routes.

For questions, email Rachel Feil, Madison Metropolitan Sewerage District project manager, or call 608-709-1832.

Detour Map
Map of Project Location​
Nine Springs Valley Interceptor System