Mount Baker-Snoqualmie National Forest (MBSNF) is located in close proximity to the Puget Sound metropolitan area in western Washington State. The Forest is facing a number of transportation issues, such as increasing congestion and decreasing availability of parking, which may negatively impact resources and visitors. The study is intended to assess transportation issues, and evaluate solutions for those issues, on and along the four major highway corridors through the MBSNF that offer winter and summer recreational opportunities: State Route (SR) 542, U.S. Route 2 (US-2), Interstate 90 (I-90), and SR 410. Due to the study's large regional scope and multi-modal approach, the limited availability of funding, and the desire to lead to specific implementation projects, the study was divided into two phases. Phase I was the scoping phase and was intended to identify how the remainder of the funding could be best used, given the multiple corridors and issues and limited resources. Phase II is based on the recommendations from Phase I.