| Tatoosh Lake Trail | Gifford Pinchot National Forest | 0.5 |
| Trail #161B leaves the Tatoosh Trail #161, climbing a fairly steep grade to the top of the ridge. The trail tread is badly eroded. The trail then descends steeply to Tatoosh Lake. |
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| Tatoosh Lookout Trail | Gifford Pinchot National Forest | 1 |
| The Lookout Trail is a short access trail from the Tatoosh Trail #161. It takes you to the site where a fire lookout once stood. |
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| Tatoosh Trail | | |
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| Tatoosh Trail | Gifford Pinchot National Forest | 9 |
| The Tatoosh Trail begins on Road 5270. It climbs through dense forest for approximately 2 miles before coming to the open subalpine terrain of Tatoosh Ridge. Following the ridge south, the trail passes many scenic openings then descends steeply to Road... |
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| Taylor Ridge Trail | Colville National Forest | 9.5 |
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| Teanaway Wilson Stock Trail | | |
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| Teely Creek Trail | Gifford Pinchot National Forest | 4.3 |
| The Teeley Creek Trail begins on Road 8410. It descends through a dense conifer forest to Pothole Lake (Lower Bertha May Lake). The trail skirts the lake, then meets with Osborne Mountain Trail #250, turns south and climbs steeply to Upper Bertha May L... |
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| Ten Miles Falls Trail | Wenatchee National Forest | 1.2 |
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| Tenmile Trail | Colville National Forest | 2.5 |
| Tenmile is an abandoned trail, but has plenty of campsites. The trail may be difficult to follow in places. Watch for loose rocks, bears, and rattlesnakes. |
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| Terry Trail | | |
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| The Brothers Trail | Olympic National Forest | 3 |
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| The Living Legacy Trail | Olympic National Forest | 1.5 |
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| The Parks | Okanogan National Forest | 2.7 |
| The trail begins in mature forest of Frosty Creek and side hills up to a high opened meadow area. The Parks are a high meadow plateau offering outstanding views into Canada and the eastern Pasayten. |
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| The Working Forest Trail | Olympic National Forest | |
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| Third Beach Trail | Olympic National Park | 1.4 |
| Third Beach Trail begins at the LaPush road, twelve miles west of U.S. 101. A sandy beach is 1.4 miles from the trailhead. |
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| Thirteen Mile Trail | Colville National Forest | 16.5 |
| Southwest exposure and low elevation make the lower trail available to the hiker when others are still snowbound. This trail is at its best in late spring when eagles soar over the Sanpoil cliffs. |
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| Thirteenmile Hiking Trail | | |
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| Thirteenmile Road | | |
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| Thirtymile Trail | Okanogan National Forest | |
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| Thomas Lake | Gifford Pinchot National Forest | 3.3 |
| This heavily used trail passes numerous lakes prior to its connection with the Pacific Crest Trail. It begins along Road 65 and climbs gently as it passes through a dense forest, coming to Dee, Thomas, and Heather Lakes at approximately 0.6 mile. The t... |
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| Thomas Lake Trail | Gifford Pinchot National Forest | 3.3 |
| Thomas Lake Trail is 3.3 miles long and located in the Indian Heaven Wilderness. |
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| Thomas Mountain Trail | Colville National Forest | 6 |
| The trail follows F.R. #530 for approximately 5 miles, with one mile that is hand constructed. During the winter users may continue on adjoining roads, which may be groomed. The trail connects to routes to Ione from Pend Oreille Lakes area. The snow co... |
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| Thornton Lakes | Ross Lake National Recreation Area | |
| This trail leads six miles one way to the summit of Trapper Peak. Views from this 5,964-foot summit are worth the 3,364-foot ascent. |
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| Three Brothers Trail | | |
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| Three Fingers Trail | Mt. Baker-Snoqualmie National Forest | 6.7 |
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