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Suffolk County says Montauk Highway bridge must be replaced; 7–8 month closure and detour planned
Summary
Suffolk County engineers told a packed public meeting that the Montauk Highway bridge over the LIRR in Hampton Bays has reached the end of its service life and that a full closure with a 7–8 month detour will be needed to replace it; residents challenged the county's traffic estimates and asked for stronger mitigation.
Suffolk County officials told residents that the Montauk Highway bridge over the Long Island Rail Road in Hampton Bays will be replaced because the structure has exceeded its useful service life and is the county's lowest-rated bridge.
"It is the worst rated bridge in Suffolk County," Gannett Fleming bridge engineer Bill DeGary said during a community meeting, citing ongoing steel section loss, frozen bearings and seismic vulnerabilities that make staged repairs infeasible. County designers said the structure was built in the early 1930s, rehabilitated in the late 1980s, and now requires full replacement.
The county and its consultants described a design that keeps one lane of traffic in each direction and restores the south‑side sidewalk; much work will be done under the existing bridge and large prefabricated 50‑foot span elements will be dropped into place when the bridge is removed.
Engineers said a temporary or staged construction approach is infeasible because of two main constraints: (1) a critical buried utility corridor—National Grid gas main and a Hampton Bays Water District line—that crosses the site and cannot be disturbed, and (2) the bridge framing and skew mean removing a key steel member would prevent the bridge from supporting traffic. Those conditions, they said, require a full detour when the existing bridge is taken out.
County staff presented a tentative schedule: construction start around summer 2029, detour beginning fall 2030 and lasting about 7–8 months with contractors off site by summer 2031. To minimize summer impacts, the county said much of the work will occur before the detour period and that prefabrication will speed replacement once the bridge is removed.
The proposed detour would route traffic onto Ponquag/Palm Quogue Avenue, Fanning Avenue and Canoe Place and include temporary traffic signals at key Fanning intersections. Consultants said their traffic model projects up to 10 minutes of additional travel time in worst‑case peak hours but acknowledged that residents and local officials believe real waits could be longer.
The county collected questions and comments and requested written input by Aug. 6 at hamptonbaysoverpass@gmail.com, and officials said a follow‑up meeting in Hampton Bays is planned for next fall.
