| Teton Crest Trail | Targhee National Forest | 18 |
| From its southern extremity at the head of Moose Creek, mush of the Teton Crest Trail is in Teton National Park. It passes through the Forest at Fox Creek Pass and Alaska Basin and then leaves the crest altogether at Hurricane Pass. No crest trail exis... |
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| The Caves Trail | Craters of the Moon National Monument | 1.5 |
| Indian Tunnel, one-half mile from the parking lot, is the largest cave and the easiest to visit. Skylights permit enough daylight to enter so that you do not need a flashlight. The other caves are pitch black, with uneven floors and low ceilings. Be su... |
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| The Pinnacle | Targhee National Forest | 2.5 |
| From the Fox Creek trailhead, follow the trail to the Fox Creek Quarry. Follow the road as it switchbacks above the Quarry. The road turns into a trail along the north edge of Fox Creek canyon. The trail follows a broad bench climbing gradually through... |
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| Three Blaze Trail | | |
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| Three Tree Butte | Clearwater National Forest | 3.5 |
| Dry ridgetop route with variety of timber and some recent logging. Old lookout site at Three Tree Butte (.6 mile). Summer hiking and winter cross-country skiing. Trail brushed out in 1996. Intersects Road #1443. |
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| Timber Mountain Trail | | |
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| Tin Cup Trail | Targhee National Forest | 3 |
| This trail starts about 1 mile up the Green Mountain trail, and is well signed. The 3 mile long trail leads to the Andy Stone trail approximately .9 mile from the Andy Stone-South Leigh Junction. Look for pre-historic algal heads along the way. The tra... |
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| Tindall Trail | | |
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| Tom Beal Creek | Clearwater National Forest | 3 |
| Located in a high subalpine type habitat, the easy to moderate hike travels through lodgepole stands, typical in old burn areas. The trail is in fair condition, offering beautiful vistas around Tom Beal Park. It crosses Tom Beal Creek numerous times. |
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| Trail Canyon | Targhee National Forest | 7 |
| Offering moderate terrain, this trail winds through heavily timbered areas. Used mostly for hunting and range access, this trail offers poor campsites and no fishing. Maintenance is intermittent, and has heavy downfall areas. |
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| Trail Creek | Clearwater National Forest | 5 |
| This is a most difficult trail for hikers or livestock because of very steep grades. The lower three miles are not recommended for use. The upper end can be accessed from Mush Saddle. This section is less steep, provides scenic views and provides acces... |
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| Trapper Gulch | Clearwater National Forest | 2.7 |
| An easy hike, this trail travels through logged areas on primative roads for the first mile before entering closed canopy forest. The last 1/2 mile is also an old road. |
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| Triguero Trail | | |
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| Trout Creek Trail | | |
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| Twenty Mile Trail | Payette National Forest | 20 |
| This trail is an easy hike for approximately the first 3 miles. After that it begins to climb steeply for another 3 miles into the high lakes area. Trailhead elevation is 5600' and the lakes are at 7800'. Much of the area burned in the Blackwell and Co... |
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| Twin Buttes Trail | | |
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| Twin Lakes | Payette National Forest | 1 |
| After walking up the trail a short distance you will have to cross the stream. The trail is a 1 mile walk up to the Twin Lakes. The trail climbs steadily but not steeply for an elevation gain of about 400'. The lake is subject to drawdown at the dam so... |
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| Tyndall Creek Trail | | |
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| Tyndall Ridge Drive | | |
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| Tyndall Ridge Trail | | |
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| Upper Basin Interpretive Trail | Clearwater National Forest | 4.9 |
| This is a nonmotorized trail that climbs through a saddle between the West Fork of Elk Creek and main Elk Creek. It has gentle grades (usually 10% or less) and is 4.9 miles in length. Very scenic with great views and plenty of chances for spotting wild... |
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| Upper Declaration Trail | | |
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| Upper Falls Loop | Clearwater National Forest | 0.3 |
| Rated easy, the trail leaves #740 and traveling down a ridgetop to a point were Upper Falls (20 foot vertical drop), as well as Elk Creek, can be viewed. |
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| Upper North Fork | Clearwater National Forest | 5 |
| This is generally a river grade trail, and easy to moderate hike, with frequent wildlife sightings along the way. The trail is in fair condition and can be hiked with little difficulty. There are some narrow, rocky segments making travel for livestock ... |
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| Upper North Fork Grouse Creek Trail | | |
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