| 45 Mile Sheep Drive Trail | Wenatchee National Forest | 4.9 |
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| Abercrombie Mountain Trail | Colville National Forest | 3.2 |
| The 3.2 miles of trail are primarily wooded until it reaches the ridgetop. The ridge is open and has scattered trees providing a spectacular view of the Pend Oreille and Columbia River Valleys. The first mile of the trail crosses a regenerated crealcut... |
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| Abernathy Truck Trail | | |
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| Abraham Trail | Gifford Pinchot National Forest | 12 |
| The maintained trail climbs a ridgeline until reaching a steep sand ladder that takes you to Windy Pass. Beyond the pass the grades become gentler as you cross the Plains of Abraham. The trail ends at its junction with Loowit Trail #216. Length: 2 mile... |
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| Agnes Gorge | Lake Chelan National Recreation Area | |
| This easy trail leads two and a half miles into Agnes Gorge from High Bridge along Stehekin River Road. |
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| Agnes Gorge Trail | Wenatchee National Forest | 3 |
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| Albert Camp | Okanogan National Forest | 8.5 |
| The Albert Camp offers scenic views of the east through lodgepole pine, trail then opens at the top of Horseshoe Mountain and then to Horseshoe Basin. |
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| Albert Camp Trail | Okanogan National Forest | 8.5 |
| From Fourteen Mile trailhead trail goes through some state land then trail breaks out into open area. Scenic views of the east through lodgepole pine, trail then opens at the top of Horseshoe Mountain and then to Horseshoe Basin. |
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| Alexander Trail | | |
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| Alger Truck Trail | | |
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| Allen Mountain Trail | Gifford Pinchot National Forest | 4 |
| Formerly Skate Mountain Trail, this lightly used trail begins on Road 8460 and climbs 2.5 miles to the top of Allen Mountain.. Here it enters the open, subalpine landscape and follows the ridge to its junction with Greenwood Lake Trail #253. |
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| Allens Bay Trail | | |
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| American Ridge Trail | | |
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| Anderson Butte Trail | Mt. Baker-Snoqualmie National Forest | 1.5 |
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| Anderson/Watson Lakes Trail | Mt. Baker-Snoqualmie National Forest | 2.5 |
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| Andrews Creek | Okanogan National Forest | 15.5 |
| The trail gently ascends the river bottom, mostly in mature forest. Near the pass the trail enters sub alpine forest and meadow areas. |
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| Angel Falls Loop Trail | Gifford Pinchot National Forest | 0.5 |
| The Angel Falls Loop begins from Covel Creek Falls Trail #228A, approximately half a mile in. The trail passes underneath a large waterfall, then climbs steeply for another half mile to the junction with Burley Mountain Trail #256. The vegetation aroun... |
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| Angel Pass Trail | Okanogan National Forest | 1.5 |
| A nice day hike out of Salmon Meadows campground. After 1 mile the trail forks with Angel Pass trail #344 on the right, and Mutton Ridge trail #365 on the left. |
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| Angel Pass Trail | | |
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| Angel Pass Trail (Tonasket RD) | Okanogan National Forest | 1.5 |
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| Angel Staircase Trail | Wenatchee National Forest | 1.5 |
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| Angle Pass Trail (Methow Valley RD) | Okanogan National Forest | 3.5 |
| A nice day hike out of Salmon Meadows campground. After 1 mile the trail branches with Angle Pass trail #344 on the right, and Mutton Ridge trail #365 on the left. |
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| Angle Peak Trail | Wenatchee National Forest | 4 |
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| Angry Mountain Trail | Gifford Pinchot National Forest | 8 |
| Located off Road 2120, the Angry Mountain Trail climbs up steep switchbacks towards Angry Mountain. After entering the Wilderness it reaches an open ridge and the grade continues until the trail ends on Lily Basin Trail #86. The highest point on Angry ... |
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| Annette Lake Trail | | |
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