United States Department of Transportation
i
Baseline wildlife monitoring at I-90 Snoqualmie Pass East, prior to the installation of wildlife crossing structures.
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2012-12-01
[PDF-10.93 MB]
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;NTL-SAFETY AND SECURITY-Highway Safety;
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Abstract:The I-90 Snoqualmie Pass East Project (SPE) is located along a 15-mile stretch of Interstate 90
that passes through the Okanogan-Wenatchee National Forest. The project corridor has been
identified as a critical connectivity zone for Pacific Northwest wildlife populations linking natural
habitats both to the north and south of the project area. The Washington State Department of
Transportation (WSDOT) will help alleviate the effects of increased traffic volume, a wider
highway and increased traffic speed by enhancing ecological connectivity at 14 Connectivity
Emphasis Areas (CEA) throughout the project area for multiple species and ecological processes.
Wildlife monitoring is needed both prior to and following the installation of project mitigation
measures to ensure that efforts to enhance ecological connectivity are achieving their intended
goals. WSDOT contracted with Western Transportation Institute (WTI) to conduct preconstruction
baseline wildlife monitoring within the I-90 SPE project area from 2008-2012.
This baseline wildlife monitoring report addresses the collection of baseline data related to
monitoring objectives. These objectives include: characterizing the rate and location of wildlifevehicle
collisions, assessing the extent of sub-grade and at-grade crossings by wildlife, and
assessing species occurrence within the Project Area. This report identifies survey methods and
approaches, provides a review of monitoring achievements, and outlines future efforts required to
ensure project success.
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