Road Ecology Center
Mitigation measures for impacts to fish habitat: Maine turnpike modernization and widening — a case study
- Author(s): Farrell, Scott
- Simmons, Richard
- et al.
Funding Source: Maine Turnpike Authority Total Budget: $25,000 Problem Statement A 30-mile segment of Maine Turnpike from mile 12 in the Town of York to mile 42 in Scarborough is proposed for widening and modernization. There are 53 different crossings associated with various streams, rivers and unnamed tributaries that are part of Maine's southern coastal drainage system. At least 17 out of the 51 streams support native populations of brook trout or brown trout. An estimated 1,892 linear feet of streambed will be lost due to extensions of existing culverts. This represents an average of about 36 feet per stream or 18 feet of streambed on each side of the Turnpike. There are also 17 streams in which some portion of the channel will need to be relocated due to either encroachment from the new embankment location or to connect the stream to the new culvert outlet location. Project Objective To mitigate for impacts to fish habitat caused by the stream crossings and relocations through a combination of habitat enhancement measures and fish passage improvements.