Summary
Many hours can be spent exploring trails in the Diablo/Colonial area.
There is a range of difficulty from valley paths to steep alpine treks.
Distances are one-way. Hikers should be well prepared and have current
information.
Thunder Creek
The Thunder Creek Trail starts at the south end of Colonial Creek
Campground near the amphitheater. It is nearly level for 9 miles (14.48
km). Hikers cross a suspension bridge at 0.8 mile (1.3 km). The trail
extends over Park Creek Pass (19 miles; 30.6 km) and joins the Stehekin
Valley Road.
Thunder Woods Nature Trail
This loop trail starts 300 yards (270 m) up Thunder Creek Trail. It is
0.9 mile (1.4 km) long and moderately steep. Interpretive brochures can be
found at in a box at the Thunder Woods trailhead.
Fourth of July Pass / Panther Creek
The Fourth of July Pass Trail is a moderately steep 9 mile (round
trip; 14.5 km) day hike. It starts 1.7 (2.7 km) miles up the Thunder Creek
Trail. An additional 3.2 miles (5.1 km) lead to the pass and mountain
views. Northwest Forest Pass required for parking at Panther Creek (East
Bank) Trailhead along the North Cascades Highway.
Pyramid Lake
A steep 2.1 mile (3.4 km) trail begins at milepost 126.8 on State
Route 20. Northwest Forest Pass required for trailhead parking. The trail
passes through an old burn area.The area has been recolonized by lodgepole
pine. Pyramid Lake is small lake with newts and rare insectivorous sundew
plants growing on floating logs.
Stetattle Creek
Stetattle Creek Trail is a moderate 2.5 mile (4 km) hike. The creekside
trail begins at the bridge at the entrance to Diablo.
Sourdough Mountain
The Sourdough Mountain Trail is a steep 5 mile (8km) trail. It starts
behind the domed swimming pool in the town of Diablo. An historic fire
lookout and panoramic views are found at the top of Sourdough Mountain.
Diablo Lake Trail
Diablo Lake Trail is a moderate 3.8 mile (6.1 km) hike. Access is from
Sourdough Creek parking area, which may be reached by driving one mile
along Diablo Dam Road from milepost 127.5 on State Route 20. A round- trip
option is to boat one way on the Seattle City Light Ferry. Daily summer
schedules: 8:30 and 3:00 up lake, and 9:00 and 3:30 down lake. A one-way
fare of $5 per adult and $4 for children ages 3-11 is charged. Children
under 3 years old ride free.
Ross Dam Trail
The Ross Dam Trail leads to Ross Dam on Ross Lake. It is 0.8 miles
(1.3 km) long and moderately steep. Access is at milepost 134 on State
Route 20 (Northwest Forest Pass required for parking). Remember: the
return hike is uphill!
Happy Creek Forest Walk
This 0.3 mile (0.5 km) boardwalk nature trail is suitable for
wheelchairs. Access is on the south side of State Route 20 at milepost
134.5. Interpretive plaques tell the story of this ancient creekside
forest.
Ruby Creek Trail
Ruby Creek Trail offers a short 0.2 mile (0.3 km) walk to Ruby Creek.
The walk can continue either upstream or downstream on paths. Interpretive
plaques explain the area's mining history. Ruby Creek is closed to fishing
to allow native rainbow trout spawning. Northwest Forest Pass required for
trailhead parking.
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