King County, Washington

Elevation Gain1ft
Trailhead Elevation553ft
Elevation Min/Max553/554ft
Elevation Start/End553/553ft


Mainline is a hiking trail in King County, Washington. It is 0.6 miles long and begins at 553 feet altitude. Traveling the entire trail is 0.3 miles with a total elevation gain of one foot. The Black Diamond Open Space parking is near the trailhead. There are also restrooms. Along the trail there is a wetland. This trail connects with the following: Cedar River to Green River Trail, Mistress, T.N.T., Creature and Black Lagoon.

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Trail Information

King County
Nearby City

Activity Feed

Sep 2018