Grass Lake is located in
eastern Plumas County.
From the Jamison Mine trailhead in the
Plumas-Eureka State Park,
it takes a 1.25-miles-long uphill hike to get to the lakes
northeast corner.
The Little Jamison Creek Trail continues
on alongside Grass Lake and through quaking aspen, then crosses Jamison Creek
and begins climbing up to the Pacific Crest Trail (PCT).
Shortly before arriving at the Little Jamison Creek Trail/PCT junction,
Mt. Washington Trail forks off to the north with spectacular
vista points, from where you can enjoy a bird's-eye view of Grass Lake as well as
Wades Lake, Jamison Lake and Rock Lake.