Along Thunder Creek Trail, the first open view is from a 1970 burn at about 4.5 miles (7.2 km). Here an emerging forest of young Douglas-fir and a profusion of seed bearing herbs and shrubs attract birds, rodents and their predators. Across the valley, note a newer burn from lightning strikes in 1990. Rock cliffs and McAllister Glacier provide natural fire breaks and a splendid backdrop for this evolving forest scene.
The next backcountry camps, McAllister hiker and stock, are located at mile 6.7 (10.8 km) and are a popular overnight destination. Pass the stock camp first, with a view from a high cliff down Thunder Creek. This view was created in the massive floods of 2003, when the river below shifted course significantly and carved into the cliff, suddenly bringing trail and hiker into much closer proximity to the creek! Hikers continue a short distance and cross the roaring creek on a log bridge to access the spacious and green creek-side hiker camp. The far site is a group site. Smaller Tricouni Camp lies 1.3 miles (2.1 km) beyond McAllister, in a more open salal forest, just after crossing Fisher Creek on a bridge.
From Tricouni, the trail begins its first real climb: a relentless 2.2 miles (3.5 km) gains over 1000 feet (305 m) to reach Junction Camps (hiker and stock) and a major trail junction. From the high ridge of the hiker camp, enjoy an expansive view of Boston Glacier and Tricouni Peak. From here, one may either take the Fisher Creek Trail 14.8 miles (23.8 km) over Easy Pass to SR 20, or continue on the Thunder Creek Trail to Park Creek Pass. Both ways lead to grand trail experiences.