Middle Fork Weber River Trail is a 15.3 mile lightly trafficked out and back trail located near Kamas, UT that features a river and is good for all skill levels. The trail is primarily used for hiking and fly fishing and is accessible from July until September. Dogs are also able to use this trail.
From the trailhead, the trail climbs south and then slowly descends southeast to the Middle Fork Weber River. The trail then continues south and crosses the river a few times until reaching a junction after three miles from the trailhead. Go straight instead of left. The trail continues along the river for another mile to an area of cascades. The trail fades away at the cascades, but cross the river and look for it on the other side. From the other side of the creek, the trail continues upstream to the south and fades in a marshy area. The trail can be picked up again, though briefly, on the other side of the marshy area, though it fades yet again after a short distance. Just continue south through a small boulderfield. There are also some fallen trees to get over before the trail is picked up again. The trail crosses the creek again at a cairn and climbs to a bench about 100 feet above the creek. After following the bench for a ways, the trail becomes well marked with cairns. The trail is (or was?) also marked with painted spots on trees and rocks, but there was talk of the forest service removing these. About 7.5 miles from the trailhead, the trail reaches the pass between Mount Watson and "East Long Mountain". Continue SSE from the saddle and along the hard to find path until you reach the main Crystal Lake to Long Lake Trail. (Alternate option: Long Lake is visible just south of the saddle, so it is possible to continue straight south and cross country to the lake with a few minor ledges to skirt.) Once at the main trail SSE of the saddle (see above), follow the main trail SW. Just before Long Lake, there is another junction with the trail to Weir Lake and North Fork Provo River. Stay on the trail to the right and to Long Lake. Long Lake is in a pretty setting, but is over-used by campers.