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Delafield staff report on historic storm impacts: lift‑station bypasses, trees down and weeks to restore lake level
Summary
City Administrator Heffner told the council that the early‑September storm produced historically high rainfall locally, inundating two lift stations that required bypass pumping (one for 2.5 days, another for 8.5 days), causing significant tree damage from saturated soils and wind, and requiring about 3½ weeks to lower lake levels to normal.
City Administrator Heffner updated the Common Council on Sept. 15 about the city’s response to an early‑September storm that officials described as a historic rainfall event in the region. The city reported two lift stations were overwhelmed and required bypass pumping, extensive tree damage from saturated soils and wind shear, and a multi‑week effort to restore normal lake levels.
What happened: Heffner told the council the storm registered near a 100‑year rainfall in parts of the area and higher intensities further east. Two of the city’s 26 sewer lift stations were overwhelmed: the West Shore Drive lift station required bypass pumping and round‑the‑clock staffing for about 2½ days; the Price Road lift station required bypass pumping and staffing for about 8½ days. The city deployed public works crews to monitor pumps and operate bypass systems.
Other impacts and response: The storm’s saturated soils followed by an early‑morning wind shear event toppled numerous trees days after the rain, creating additional cleanup needs. The city coordinated with the Wisconsin Department of Natural Resources on dam operations; Heffner said the DNR allowed greater flexibility during the emergency and that it took roughly 3½ weeks for lake levels to return to their normal mark. Heffner said the city would participate in regional conversations about future flood response and mitigation; the Village of Summit was considering a task force and had asked Delafield administration to participate.
Costs and next steps: Heffner provided a written memo and briefing materials to the council (in the meeting packet) and said staff will continue after‑action review and coordination with neighboring communities and the DNR. Heffner also noted the upcoming 2026 budget schedule and called attention to key budget dates for council consideration.
Quoted: “It really was a historic event as far as the amount of rain,” Administrator Heffner said. “Those were the major things we’re looking at right now.”
Context: Heffner and several council members praised public works, police and Lake Country Fire & Rescue for the emergency response. The council was advised that the city’s dam operations are managed in coordination with the DNR, and that residents seeking information about localized flooding should consult both city channels and DNR guidance.
What was not decided: The council received the report; no new policy or capital program was adopted at the Sept. 15 meeting. Staff said after‑action review and intergovernmental coordination efforts will continue.
