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Marshfield approves steps to pursue DNR stormwater grant for Mil Creek wet detention basin
Summary
The board approved a resolution authorizing the public works director to act on grant documents and approved applying for a WDNR urban non-point source construction grant that would cover 50% of design and construction costs up to $150,000 for a Mil Creek wet detention basin project estimated near $1 million and planned for 2028.
City engineer Tim Cassidy presented two stormwater items to the board related to compliance with the DNR-mandated TMDL study and the city’s MS4 permit requirements, and the board approved both a governmental-responsibility resolution and a motion to apply for construction grant funding.
Cassidy explained that converting the Mil Creek Business Park dry detention basin to a wet detention basin is included in the 2026–2030 capital improvement program, with construction currently scheduled for 2028 and an estimated project cost near $1 million. He said the Wisconsin Department of Natural Resources (WDNR) urban non-point source and stormwater construction grant program could fund 50% of design and construction costs, up to a maximum of $150,000, and that applications were due April 30, 2026.
"The city's MS4 permit requires at a minimum a 10% total phosphorus reduction be achieved over the current permit term," Cassidy said, referencing the DNR’s TMDL work for the Wisconsin River Basin and noting that wet detention basins are a cost-effective method to reduce phosphorus and suspended solids.
Cassidy asked the board to approve Resolution 2026-05 to authorize the public works director to sign grant documents, submit reimbursement claims and reports, and provide necessary documentation for grant administration. The board voted to approve the resolution and then approved a separate motion to apply for the construction grant.
Cassidy noted that earlier in February the common council approved a budget resolution to fund grant-writing services for the application. He also warned that the original CIP did not allocate grant assistance in 2026; the adopted February resolution added funding for grant assistance so the application could proceed.
Next steps: staff will submit the grant application before the April 30, 2026 deadline and, if the grant is awarded, the city will follow the resolution’s authorization process for grant administration. Construction remains anticipated for 2028, subject to grant awards and future budgeting decisions.
