Thompson Lake Trail is a 20.7 mile out and back trail located near Kamas, UT that features a lake and is rated as difficult. The trail is primarily used for hiking and is accessible from July until September.
The Highline Trailhead is located 34.5 miles east of Kamas on the Mirror Lake Highway (U-150).
Going into the four lakes basin is tough but worth it. We did a day hike from there to Thompson lake and was totally worth it. You might never find a less fished lake.
Fairly easy trail until you get to the Four Lakes Basin and start climbing Cyclone pass. Once you get down the other side you have to boulder hop to get to Thompson Lake.