VTrans Internal Structure Repair of Culverts

Beneath U.S. Route 5, two corroded culverts—56” and 77” in diameter—required rehabilitation to restore their structural integrity, extend their service life, and stop the sagging of the roadway above. Located 40 feet below ground, replacing these culverts would have necessitated a disruptive and costly open-cut excavation which would have greatly impacted slope stability, erosion, natural resources, and the traveling public. Instead, our team partnered with the Vermont Agency of Transportation (VTrans) to deliver a trenchless solution using centrifugally cast concrete pipe (CCCP) to sustainably repair and strengthen the pipes.

In addition to rehabilitating the culverts, the design included resurfaced pavement, upgraded guardrails, and slope stabilization, further improving safety and reliability in the area. Using CCCP also enabled the installation of baffles for fish passage, meeting Vermont’s Aquatic Organism Passage guidelines. Substantially completed on schedule and under budget, this was VTrans’ first culvert rehabilitation of this scale, setting a benchmark for innovative, cost-effective, and sustainable infrastructure projects.