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Lamoille County Planning Commission

 

Jeffersonville/Cambridge Flood Resiliency Project

The Village of Jeffersonville (located within the Town of Cambridge) has been working with the
Lamoille County Planning Commission (LCPC) to develop its first Hazard Mitigation Plan. As
part of the development of this Plan, LCPC and the Village contracted with an engineering firm to
develop a model of flood hazards in the Village. This project will provide funds to implement two
of the alternatives that have the greatest potential to reduce flood levels in the Village. The Town
of Cambridge has applied for Community Development Block Grant Disaster Relieve Funds to
implement these alternatives.

 

Route 15 Bypass Culverts


The flood modeling identified enlargement of two culverts under Route 15 as having a significant benefit to reduce flooding. Further engineering analysis has been conducted to refine the size, length, and processes needed to undertake implementation. Two culverts were selected to improve flow conveyance from the flood chute to the Lamoille River based on their location and proximity to infrastructure.

Culvert #1: A new 3’0” diameter culvert will be installed next to an existing an 18-inch corrugated metal pipe located on the upstream (northwest) edge of the Route 15/Route 108 roundabout, and a 4- foot diameter circular pipe under the G.W. Tatro Construction driveway. The land approaching the culvert inlet to allow flood waters will be lowered to direct flood waters in the “flood chute” to enter the culvert rather than into the Village.

Culvert #2: An an 18-inch metal pipe in disrepair will be replaced with a large box culvert 2 feet deep by 13 feet wide. Additional improvements include lowering the first trail embankment along the flow path downstream of the highway and shortening the existing culvert, lowering the existing swale between the two trail crossings along the flow path, and installing a 18’ culvert under the second trail crossing along the flow path.

Grading, and excavation related to installation of the culverts will result in movement and/or removal of ~100 cubic yards of material. 

ROUTE 15 BYPASS CULVERT REPLACEMENTS PROJECT PLAN


Cambridge Greenway/Railroad Bridge

 


Based on the flood modeling study the Cambridge Greenway/Railroad Bridge over the Brewster River is significantly undersized. The existing bridge has a span of 52 feet and a low chord elevation of 454.1’ For reference, this is below the 100-year flood elevation (460.57’ and the 10-year flood elevation (457.43) As a result, the bridge is impacted by flood waters on an almost annual basis.

The bridge will be replaced with an adequately sized and proportioned bridge. The project will involve removing the existing abutments and minor floodplain restoration in the vicinity of the abutments ~0.4 acres to a depth of ~7.5 feet).

Bridge Resiliency Project Slide Show

Questions?  Please contact Seth Jensen