Mountains to Sound Greenway

Following Washington's Interstate 90 from the shores of the Puget Sound to the foothills of the Cascade Mountains, the Mountain to Sound Greenway embraces 100 miles of natural wonder, beauty, and history.

Much of The Trust for Public Land’s early work in Washington State was focused on preserving the integrity of this beautiful natural corridor. The impetus for our work came from the ground up.  As Seattle began spreading outward along the I90 toward the small timber towns and farming communities to the east, the Issaquah Alps Trail Club began to lobby for an unbroken ribbon of protected land from the Puget Sound to the Cascade Mountains, and TPL immediately signed on to the initiative.

By 1991 participants from federal, state, and local governments, as well as landowners, recreation interests, wildlife experts, and local people were all working on the plan, and TPL established the Mountains to Sound Greenway Trust as a separate organization with the sole mission of protecting the Greenway. Today, The Mountains to Sound Greenway Trust is thriving, with the mission to lead and inspire action to conserve and enhance the landscape from Seattle across the Cascade Mountains to Central Washington, ensuring a long-term balance between people and nature.

Now one of the busiest highways in the state is also one of the most scenic, snaking through spectacular forest lands, past high alpine lakes towards the sound. In all, TPL has helped to protect well over 10,000 acres of land along the Greenway, and we continue to offer our help whenever it is asked.