Baseline wildlife monitoring at I-90 Snoqualmie Pass East, prior to the installation of wildlife crossing structures.
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Baseline wildlife monitoring at I-90 Snoqualmie Pass East, prior to the installation of wildlife crossing structures.

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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 ;
    • 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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