United States Department of Transportation
i
Division of Planning Research On-Call Task #10 - Deer Passage Through Rock Channel Protection (RCP) Designs and Options
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2022-11-01
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[PDF-3.67 MB]
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Edition:Final Report
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Abstract:One safety-related issue that has been identified by ODOT is deer crashes. ODOT OES is proposing to install a "deer passage" within the rock channel protection (RCP) underneath highway bridges that would allow for the deer to pass under the highway instead of going across on the surface. The purpose of this research was to analyze the feasibility of constructing passages within RCP installations under bridges, considering both the needs of the wildlife as well as the technical requirements for ODOT bridges. To meet the needs of wildlife, the passage should include minimum width: 3 feet; minimum vertical clearance: 6 feet; follow along natural stream bank; natural “look and feel” of approaches with minimal obstructions; and deliberate connectivity to habitats on both sides of the passage. Implementation costs were estimated to range between $21,800 and $84,100 depending on scope. It is recommended that the installation of the deer passage be pursued for any bridge location that experiences one or more recorded deer-involved crash per year within one-half mile of the bridge. Installation of the deer passage results in an benefit with 1 recorded deer crash in the last 3 years if a 90% effectiveness is assumed and 1 recorded deer crash in the last 2 years if a 50% effectiveness is assumed.
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