Rochester council approves conditional use permit to place excavated fill in flood-prone area, amid resident concerns

The Rochester City Council voted 5–1 on Feb. 18 to adopt a resolution approving Conditional Use Permit CD2025-0007, allowing the placement of excavated fill within a 100-year flood-prone subdistrict to provide compensatory stormwater storage for a future multifamily project.

City staff presented the application for ML Group I LLC, saying the permit pertains only to excavation and placement of fill and does not grant building permits or final plats. Elliot Mueller of Rochester Community Development told the council the development review team and planning commission recommend approval with three conditions tied to subsequent grading, wetland review and a future floodplain permit for structures and roads.

Opponents, including Meadowlakes homeowners, pressed the council on hydrology and long-term effects. "Once that dirt is pulled out of the ground and piled up in another place, you've changed nature's fully functional flood plain, and it won't be undone," said Matt Puffer, representing the Meadowlakes homeowners association. Puffer and other residents pointed to a significant 2019 flood and questioned pond depths, groundwater elevations and whether redirecting flows could increase erosion and worsen water quality in Cascade Creek.

Applicant Bill Toyton of WCE Engineering said the project team provided a Barr Engineering memorandum indicating "no rise" from the proposed excavating and filling. Toyton explained the project requires a mass grading plan, FEMA map revisions, and additional traffic and site-plan reviews before any building permits would be issued. He said the submitted compensatory-storage calculations and preliminary grading plans have been reviewed by City Public Works.

Council members asked staff how the proposed work would be validated during and after construction. Staff said the county acts as the local floodplain administrator, DNR would be involved if state waters are affected, and the city would require final approval of grading plans and any wetland impact permits before earth-moving begins. Councilmember Miller sought clarity on how groundwater elevations were handled and whether models use historic or projected rainfall; staff said modeling used current rainfall charts and that the city's stormwater team is updating broader surface-water-management approaches.

Councilmember Palmer moved the resolution, the motion was seconded and passed 5–1 with Councilmember Miller recorded as the lone "nay." The approval includes the three staff-recommended conditions: full grading-plan approval by Public Works before moving dirt; approval through the technical-evaluation panel and Olmsted County for any proposed wetland impacts; and a second floodplain development permit for buildings and roads.

The decision does not authorize any construction beyond earthwork, and staff told the council that additional permits and reviews remain before development can proceed.