Please register or login . Petersburg Creek itself spills down through a typical U-shaped glacial valley with vertical granite outcroppings along the way. Mountain peaks overlooking the valley reach their highest point at 3,577 feet and slope down to sea level muskeg flats. The Duncan Salt Chuck itself, a large tidally-influenced salt marsh, has rocky rapids constricting its opening on the sea making slack high tide periods the safest time to approach. Streams within the Wilderness, primarily Petersburg Creek and Salt Chuck Creek, support runs of pink, sockeye, chum and coho salmon, and steelhead trout.
Black bears are especially dense here.
Typical of Southeast Alaska, spruce and hemlock make up most of the forest. Thick undergrowth includes the awesome devil's club with spikes to rip the clothes off careless hikers. I bear witness that devil's club is also capable of ripping off human skin, having left patches of myself on several plants. Wind and rain are common is summer, and wind and snow in winter, with snow accumulations reaching 200 inches on the area's mountaintops. Wilderness boundary up Petersburg Creek itself to a USFS cabin on Petersburg Lake.