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Little Si Trail is a hiking trail in King County, Washington. It is within Mount Si Natural Resources Conservation Area. It is 1.9 miles long and begins at 502 feet altitude. Traveling the entire trail is 3.8 miles with a total elevation gain of 1,572 feet. Near the trailhead there are parking, an information board, and restrooms. Along the trail there is a bench. The trail ends near Little Si (elevation 1,516 feet). There are also viewpoints near the end of the trail.
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