| Absaroka Trail | | |
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| Alaska Basin Trail | | |
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| Alaska Basin Trail | | |
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| Allen Basin Trail | Medicine Bow-Routt National Forests | |
| This short trail west of Yampa near Crosho Lake, leads from Crosho Lake to Allen Basin Reservoir. |
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| Amethyst Lake | High Uintas Wilderness | |
| This 13-mile round-trip hike will take you up a glacier-carved valley to pretty lakes set beneath high ridges. You can visit on a long day hike or spend a night or two for a more leisurely exploration. From 8,790-foot Christmas Meadows Trailhead, the p... |
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| Amphitheater Lake Trail | | |
| Awesome trail. Super steep!
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| Amphitheather Lake Trail | Grand Teton National Park | 9.6 |
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| Anderson Creek Trail | | |
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| Andy Stone Trail | | |
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| Angeline Trail | | |
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| Arizona Creek Trail | | |
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| Arlington Pack Trail | | |
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| Artist Paint Pots | Yellowstone National Park | 0.5 |
| The trail winds across a wet meadow on boardwalk then enters a partially burned lodgepole pine forest. The thermal area within the short loop at the end of the trail contains some of the most colorful hot springs and small geysers found in the area. Tw... |
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| Artist Point Trail | Yellowstone National Park | 0.25 |
| This easy walk takes you to what some call the Grand Canyon of the Yellowstone River's most famous view spot. Here you are afforded sweeping views of 308-foot-high Lower Falls. Note the beautiful green stripe in the water that forms the falls. This col... |
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| Aspen Creek - Mt. Leidy Trail | Bridger-Teton National Forest | 3 |
| This trail has access to Mt. Leidy area and the northern part of the district. It begins at the Carmichael Fork of Slate Creek near the mouth of Aspen Creek and ends at a jeep road near Leidy Lake. |
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| Atlantic Pacific Creek Trail | | |
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| Avalanche Peak Trail | Yellowstone National Park | 7 |
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| Back Basin Self-Guiding Trail | Yellowstone National Park | 1.5 |
| In addition to Echinus, there is plenty along this walk for those fond of the striking colors often found in thermal basins (the result of both minerals and micro-organisms). For starters, visit Cistern Spring, located along the middle section of the f... |
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| Bacon Creek Trail | Bridger-Teton National Forest | 6.5 |
| This trail begins at the mouth of Bacon Creek and ends at this description ends at the district boundary. The trail continues on to Buffalo Meadows area. |
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| Badger Creek Trail | | |
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| Bailey Creek Trail | Bridger-Teton National Forest | 9 |
| Bailey Lake is the largest lake on the district (35 acres), fishing is good and waterfowl can be viewed around the lake. |
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| Baldy Lake Trail | | |
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| Baldy Trail | Medicine Bow-Routt National Forests | |
| The Baldy Trail is located near Pyramid, in the Flat Tops west of Yampa. It leads from Forest Highway 16, southeast past Baldy Mountain and Pyramid Peak to intersect with trail the Black Mountain Creek Trail #1117. |
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| Barber Lake Trail | Medicine Bow-Routt National Forests | 4.5 |
| The trail is almost entirely downhill and does not require a great amount of endurance, but does require skill as it winds its way down an exciting combination of old roads and ski trails. Most users leave a shuttle vehicle at Barber Lake or Corner Mou... |
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| Barrs Hill Trail | Bighorn National Forest | 6.5 |
| This trail starts on a steep slope called Barrs Hill and drops off into the Tongue drainage. The North and South Tongue Rivers meet along this unique riparian zone. The trail parallels the Tongue River on the south side winding through aspen, pine and ... |
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