Addison
VT Route 125, Culvert 1

Addison BF 0172(9)
Project Location: Town of Addison in Addison County on VT Route 125 over Wards Creek. The bridge is located approximately 1.3 miles east of the intersection with VT Route 17, at approximately mile marker 1.22.

This project consists of the replacement of the existing 9’ diameter corrugated galvanized multi-plate pipe. The existing culvert, installed in 1936, is considered to be in serious condition, rated 3, with holes throughout its length. The culvert is 33’ long.
VTrans evaluated alternatives for rehabilitation or replacement of the culvert in an engineering study completed in December, 2017. The study assessed the proposed design criteria for the bridge, Right-of-Way impacts, wildlife impacts, hydraulics, cultural resources, and wetland impacts. Several alternatives were considered including no action, pipe rehabilitation, and structure replacement. Pipe rehabilitation alternatives included a new pipe liner, spray-on pipe liner, cured-in-place liner, and replacement of the invert with a new concrete invert installed below the elevation of the existing invert to preserve the existing waterway area. Placement of a new pipe by jack and bore was considered. Finally, complete replacement was considered, using a road closure with detour, a temporary bridge, or constructing the new culvert in phases while keeping traffic moving through the work zone.

Given the age of the structure, site constraints, and current conditions, the engineering study recommended replacement of the pipe by installing a new concrete box culvert or new pipe while maintaining traffic via an off-site detour. 

The existing roadway is substandard in width and clear zone. Also, there is no guardrail present. This project is not in a high crash location, and although reconstruction of the roadway is not proposed, the new culvert provided will be long enough to accommodate a future widening project.