Dowsville Road Culvert Replacement

Duxbury, Vermont

Client: Town of Duxbury, VT


  • Right-of-Way Coordination
  • Hydraulic Analysis
  • Cost Estimating
  • Regulatory Agency Coordination & Compliance

Project Summary

In summer 2016, the existing Dowsville Road metal pipe culvert over an unnamed brook partially collapsed causing a southern embankment failure and constricted hydraulic capacity. In summer 2017 the Town procured the services of Hoyle, Tanner to assist with a study to develop temporary stabilization measures and to perform the design services for the replacement structure.

The project was designed and permitted within 7 months, with construction completed in October 2018. Hoyle, Tanner took an innovative approach to this box culvert project by proposing a form-lined bottom that mimics a natural stream bottom. The form-liner includes a boulder pattern designed using our 2D hydraulic software that reduces design velocities and maintains water depths and provides relief areas for aquatic organism passage. Our project team worked closely with state and federal regulatory agencies, including Vermont Fish and Wildlife to advance this concept which was fabricated and installed with high praise from the precast manufacturer and contractor. Funding was provided through the VTrans Town Highway Emergency Grant program.

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