Mountains to Sound Greenway, Conservation corridor in Western Washington State, United States
The Mountains to Sound Greenway is a conservation corridor in western Washington State that runs along Interstate 90 from Seattle to Ellensburg. It connects forests, farmland, and small towns across a long stretch of the Cascade Range.
The greenway took shape in 1990 when a group of citizens hiked from Cascade Crest to Seattle to draw attention to unplanned development along the corridor. The following year, they formed the Mountains to Sound Greenway Trust to protect the land formally.
Several Native American nations practice traditional fishing and hunting throughout the corridor as part of their ongoing way of life. These activities shape how people connect with and move through the landscape today.
The corridor has many access points along Interstate 90 and is open year-round, though higher elevation areas can be challenging in winter. Visitors planning to explore more than one section should allow plenty of time, as each area has its own character and terrain.
Even though Interstate 90 runs through the heart of the corridor, the highway was designed with wildlife crossings that allow animals to move safely from one side to the other. Some of these crossings are covered with native plants to help animals feel at ease while passing through.
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