| Crystal Lake Trail | Mt. Baker-Snoqualmie National Forest | 5 |
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| Crystal Lakes | Mount Rainier National Park | |
| This trail leads to two alpine lakes in the eastern portion of the park. It is a very popular trail so don't expect solitude when you're on it. |
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| Crystal Mountain Trail | Mt. Baker-Snoqualmie National Forest | 9.1 |
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| Cultus Creek | Gifford Pinchot National Forest | 1.5 |
| This heavily used trail begins at Cultus Creek Campground, enters the wilderness and climbs semi-open slopes toward the summit of Bird Mountain, a 1.5-mile-long backbone ridge. The trail climbs 1,200 feet in elevation before passing through a saddle at... |
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| Cultus Creek Trail | Gifford Pinchot National Forest | 1.2 |
| The Cultus Creek trail is 1.5 miles long and located in the Indian Heaven Wilderness. |
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| Curly and Miller Creek Trail | Gifford Pinchot National Forest | 0.1 |
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| Cussed Hollow Trail | Gifford Pinchot National Forest | 3.3 |
| Cussed Hollow Trail receives low use and features forested paths and high country Views. |
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| Cutthroat Lake/Pass | Okanogan National Forest | 5.5 |
| This is an easy hike into alpine lake cradled in a high-walled cirque. Although there is no camping at the lake, it is a good hike for a picnic or afternoon of fishing. |
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| Daisy Trail | | |
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| Dalles Ridge Trail | Mt. Baker-Snoqualmie National Forest | 1.8 |
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| Dalles River Trail | Mt. Baker-Snoqualmie National Forest | 0.8 |
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| Damfino Lakes Trail | Mt. Baker-Snoqualmie National Forest | 3 |
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| Dark Meadow Trail | Gifford Pinchot National Forest | 3.2 |
| Dark Meadow Trail begins on Road 23, then crosses East Canyon Creek. The trail passes through Douglas fir and western hemlock, before crossing Dark Creek (at mile 1.5), and climbing steeply toward the Dark Meadows area and Juniper Ridge Trail #261. Thi... |
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| Dark Meadows Trail | | |
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| Davis Mountain Trail | | |
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| Davis Peak Lookout Trail | | |
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| Davis Trail | | |
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| Deadfall Trail | | |
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| Deception Creek Trail | Mt. Baker-Snoqualmie National Forest | 10.3 |
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| Deception Falls Interpretive Trail | Wenatchee National Forest | 0.5 |
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| Deep Creek Trail | Mt. Baker-Snoqualmie National Forest | 4 |
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| Deer Creek Summit North Loop Trail | Colville National Forest | 1.61 |
| During snow season this is an excellent cross-country ski loop. The trail takes 3 to 3.5 hours and requires intermediate skills. After the snow melts the loop is a broad bike trail. Adjacent to the trailhead is a maintained campground. |
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| Deer Creek Summit South Loop Trail | Colville National Forest | 5.5 |
| This 5.5 mile loop provides views of the Kettle Crest and Kettle River Valleys. |
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| Deer Creek Truck Trail | | |
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| Deer Creek and Kelcema Lake Trail | Mt. Baker-Snoqualmie National Forest | 0.6 |
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