Milwaukee Opens $123M Sediment Containment Site
The 42-acre lakeside facility holds 1.9 million cubic yards of toxic river sediment, expected to fill over 20 to 30 years.
Updated on Nov. 3, 2026 in Environmental
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The Milwaukee Metropolitan Sewerage District has completed a $123 million Dredged Material Management Facility on 42 acres along Lake Michigan, built to hold contaminated river sediment. The facility is an operating containment structure, not a finished cleanup, and dredging will move toxic sediment from the Milwaukee, Menomonee and Kinnickinnic Rivers into it.
Why it matters
The Milwaukee Estuary was designated an area of concern by the U.S. and Canada in 1987 after companies dumped sediment containing PCBs, PAHs and heavy metals into the waterways more than 100 years ago. The facility gives that legacy pollution a contained destination rather than leaving it in the riverbeds.
The facility's specifications are a 1.9 million cubic yard sediment capacity and a perimeter wall 2.5 to 3 feet thick, with the cost reported at $123 million and under budget. Monitors track water levels both inside and outside the containment, and the source does not report any performance results from operation yet.
The players
Milwaukee Metropolitan Sewerage District
The regional wastewater agency that built the Dredged Material Management Facility and manages the Milwaukee-area sewer and stormwater system.
The details
Dredging boats vacuum sediment from deep in the riverbeds and tunnel it to the facility. A soil mix cutoff wall, a barrier that forms an impermeable perimeter, surrounds the site so contaminated material stays contained. Monitors measure water levels inside and outside the structure to confirm the containment holds.
Timeline
1987: The Milwaukee Estuary is designated an area of concern by the U.S. and Canada.
October 2026: The Dredged Material Management Facility is completed.
Over the next 20 to 30 years: The facility is expected to fill with sediment.
The Tech Race
The facility is a containment-based approach to legacy sediment pollution, one of 31 Great Lakes areas of concern that have been designated. Its 20 to 30 year projected fill time and the open question of a future cap place it within a longer, multi-decade remediation effort rather than a one-time fix.
Residents near the Milwaukee rivers and Lake Michigan shoreline are affected by the cleanup of sediment that has long contaminated the waterways. The source does not state any change in water access, fishing or recreation for the public during or after dredging.
The takeaway
The facility shows how legacy river contamination can be contained in a purpose-built site, though its 20 to 30 year fill timeline means the problem will be managed for decades. Watch for whether the projected cap is built on top of the facility as the sediment accumulates.
Further reading
For more on the pollution and cleanup efforts behind this project, see Environmental coverage.
Source note: This article includes information reported by WPR.
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