Project Location: Town of Elmore in Lamoille County on VT Route 12 over unnamed brook. The bridge is located approximately 11.0 miles south of the junction with VT Route 15A.

The Elmore Bridge 90 project includes the replacement of the existing Corrugated Galvanized Metal Plate Pipe (CGMPP). The existing culvert was built in 1964 and has a span of 6-feet and is 208 feet long. There is an average of 18 feet of fill over the culvert. The structure currently has a culvert rating of 3 (Serious), and a channel rating of 4 (Poor). There is heavy rust scaling and holes throughout the invert. The pipe has buckled under the roadway and cracks have formed.

VTrans evaluated alternatives for rehabilitation or replacement of the bridge in an engineering study completed in May, 2020.  This study assessed the proposed design criteria for the structure, right-of-way, rare/threatened/endangered species impacts, hydraulics, and archaeological resource impacts. Several alternatives were considered, including: no action, replacement with a new culvert, and repalcement with a bridge. An offsite detour, phased construction, and a temporary roadway were evaluated as potential maintenance of traffic options.

Given the age of the structure, substrandard hydraulics, site constraints and current conditions, the engineering study recommended a full bridge replacement with a bridge while one lane of alternating traffic is maintained during construction.