Critical defects found under Harris Street bridge; city proposes truck detours and engineering repairs

A routine DOT bridge inspection returned critical structural findings for the Harris Street bridge (near South Andrews and South Madison). On May 18, public works staff briefed the council on spalling and exposed rebar in multiple prestressed concrete channels beneath the bridge, described as the worst condition in channels numbered 2, 6 and 16.

Engineering timetable and scope: Stantec (DOT’s inspecting firm) provided the city a critical‑findings letter advising expedited repair planning. The city has engaged a consulting engineer (Weather) to perform an on‑site review, prepare a 10‑day repair plan submission to DOT, and design repairs. Staff cautioned that short‑term repairs are feasible but a long‑term replacement (for example, a box culvert) may be the most cost‑effective solution, particularly because the bridge carries utilities that will require directional drilling or relocation.

Traffic mitigation: Because the bridge’s current posted capacity is six tons, staff proposed targeted message boards and signed detours to keep heavy truck traffic off Harris Street while allowing passenger vehicles to continue, noting Elm Street is already closed nearby for other work. Public works emphasized the inspector’s letter did not call for immediate closure to passenger traffic but did recommend timely repairs. Council supported a plan to divert truck flows and explore a formal no‑through‑truck policy and signage for the corridor.

Costs and funding: Staff noted directional drilling for an underlying water main and the broader structural replacement would add significant cost; ballpark utility relocation figures were cited in discussions but final estimates require design. Council directed staff to prepare repair/design cost estimates and funding options and to report back.

Provenance: The briefing and Q&A occurred during the May 18 council meeting; public works will provide a repair plan submission to DOT as required by inspection protocols.