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Council ends further action on Iowa Street box culvert after consultant tests find no significant defects
Summary
After testing that included an underwater ROV, dye testing and electrical connectivity checks, the council directed no further work on the box culvert along Iowa Street and West Seventh Avenue; residents' basement complaints remain on the record.
The Oshkosh Common Council on June 24 heard staff and consultant findings from an investigation of a box culvert that encloses Stringham Creek along Iowa Street and West Seventh Avenue and declined to direct further work.
A consultant hired by the city, Ramble Americas and its subconsultants, conducted multiple testsincluding use of a remote-operated vehicle (ROV) to inspect the culvert underwater, dye testing and an electro-conductivity testand reported no significant structural defects or clear leakage paths that would explain some residents—9 reports of basement water intrusion.
Why it matters: Residents had raised repeated concerns about basement water after a 2024 reconstruction of a section of West Seventh Avenue and Iowa Street. The council previously authorized a consultant review; tonight staff summarized the testing results and presented the consultant—9s report, which did not recommend additional immediate remedial work.
Council response and direction: Council members expressed sympathy for affected residents but said the city has already invested significantly in investigation. Several members said the testing appeared methodical and scientific and that no clear next step had been identified that would likely resolve the issue. The council gave staff no new direction to pursue costly additional tests or repairs at this time.
What was tested: Staff described four types of tests the consultant performed: (1) an ROV run through the storm sewer while submerged; (2) dye testing to detect flows; (3) electro-connectivity measurements with an electrode outside and the ROV inside the culvert; and (4) other inspections and analysis summarized in the report.
What remains unresolved: Residents—9 complaints remain on the public record. Council members said the matter could return if new, specific evidence is presented but declined to fund further investigation based on the current report.
Next steps: No further direction was given to staff; the report will remain part of the public record and staff will monitor for additional citizen reports or new data that would warrant reexamination.
