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I-90 Snoqualmie Pass East Pre-Construction Wildlife Monitoring

Started: September, 2007 Ended: May, 2008 Project ID #4W1890 Status: Completed


Implement and document a pre-construction wildlife monitoring program for the I-90 Snoqualmie Pass East construction project in Washington.


The Interstate 90 corridor through Snoqualmie Pass is positioned between a number of important National Forests, wilderness areas and National Parks that provide refuge for a diverse array of wildlife species. As a result, the highway has created barriers to ecological connectivity for wildlife within and among these areas. The location has high levels of traffic, with an average of 28,000 vehicles passing through it on weekdays, and as many as 58,000 on weekends. Moreover, traffic levels are expected to double on this section of I-90 over the next 20-30 years. The Washington State Department of Transportation (WSDOT) plans to widen this section of road from four lanes to six lanes, to accommodate increased traffic and higher speeds, and to enhance safety. As part of the widening project, WSDOT is investigating ways to resolve and address wildlife connectivity issues in the course of construction. In partnership with WSDOT and a multi-agency Wildlife Monitoring Technical Committee, WTI developed a Wildlife Monitoring Plan to guide the design and implementation of pre- and post-construction monitoring of ecological connectivity for wildlife. The Plan divides proposed monitoring activities into two tiers. Tier 1 will evaluate basic transportation management questions regarding the performance of crossing structures and fencing. Tier 2 will build on the results of Tier 1 to address more complex questions about the effects of the project and adjacent land use and management on wildlife populations. This project creates an ongoing partnership between WSDOT and WTI to implement components of the Plan for pre-construction monitoring. Through a series of individual Task Orders, WTI researchers will carry out pre-construction monitoring activities as needed and as directed by WSDOT. Types of tasks are generally described below, but will be specifically defined through the individual task orders and contract agreements. Task orders may evolve over the course of the contract, and complementary or supplementary tasks may be added as warranted by the findings of initial research.


Files & Documents

Sponsors & Partners

  • Washington Department of Transportation (WSDOT) Sponsor

Part of: Road Ecology

Project Tagged In: highway crossing structures, wildlife monitoring, connectivity

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