St. Louis County outlines timeline for Trinon Lane Bridge (No. 274C) replacement, targets 2027 reopening
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Summary
St. Louis County said inspections found severe deterioration that closed Trinon Lane Bridge (No. 274C) on Sept. 18, 2024, and outlined a design, right-of-way and funding timeline that anticipates environmental approval by MoDOT in January 2026 and construction advertised in early 2027.
An unidentified presenter from the St. Louis County Department of Transportation and Public Works said the county plans to replace Trinon Lane Bridge (No. 274C) after annual inspections found serious deterioration and the structure was closed on Sept. 18, 2024. "As part of the annual bridge inspections, county staff discovered significant deterioration on 09/18/2024 that resulted in a full closure of the structure," the presenter said.
The presenter outlined the procurement and design schedule. County staff posted a request for engineering services in November 2024, the solicitation was due in January 2025 and an engineering firm was under contract by April, the presenter said. Preliminary plans were submitted in September for county review and sent to the Missouri Department of Transportation (MoDOT) for environmental review. The presenter said those plans were "awaiting environmental approval by MoDOT staff that was actually anticipated by January 2026."
On design, the presenter said the replacement bridge would have two 12-foot lanes with a shoulder on each side and concrete barriers to protect vehicles and pedestrians. The presenter described right-of-way work as the next step: the plan view shown during the briefing circled nearby parcels and the presenter said county staff would begin contacting owners about property acquisition by mid-2026. The presenter said right-of-way plans from the engineering firm were due in February with approval planned by May and that final plans would be submitted for review by August with approval anticipated by the end of that year.
The county intends to advertise the project for construction in early 2027 and expects to complete construction and reopen the road in 2027, the presenter said. The presenter also said the county was awarded federal reimbursement for construction expenses and that "county taxpayers will see the benefit of savings of over $750,000 for this project."
The presentation closed with a reminder that the county project webpage will be updated as milestones are reached and with contact information for the St. Louis County Department of Transportation and Public Works for questions or comments.