Thunder Creek is a beautiful old-growth forest hike alongside a glacial creek. The trail crosses Thunder Creek on a suspension bridge at approximately 2 miles (3.2 km), then continues for another 38 miles (61 km). For mountain and glacier views, turn off onto the 4th of July Pass Trail 0.1 miles (0.16 km) beyond the bridge.

• Difficulty: Moderately strenuous. 
• Distance and elevation: 10 miles (16.1 km) roundtrip / 2,300 ft (700 m) elevation gain.
• Access: The trailhead is located at the south end of Colonial Creek Campground.
• Leashed dogs allowed along the first 7 miles (11.2 km) of Thunder Creek Trail and to 4th of July Pass.

Detailed trail decription.