Hot Spring North Arm Peril Strait
Emerging at 100 degrees Fahrenheit with elevated salt and mineral content, this spring flows into the Tongass National Forest's dense coastal rainforest near Peril Strait, a major shipping and marine wildlife corridor.
The spring's water contains 786 milligrams per liter of dissolved solids with notable sodium sulfate chemistry, reflecting deep geothermal sources. Dense rainforest covers steep terrain with frequent fog, heavy precipitation, and productive salmon streams.
Access requires 12 miles of backcountry hiking and water travel. Moser Island Cabin provides a nearby base for multi-day exploration. Visit during summer months when weather permits safe water travel and hiking.
Geochemical analysis reveals water at 38.5 degrees Celsius with substantial sodium and sulfate concentrations, indicating interaction with deep thermal systems. The thermal feature exists within a region of Tongass National Forest protections.
The water at Hot Spring North Arm Peril Strait contains 786 mg/L total dissolved solids. It is notably rich in sulfate (traditionally used for skin conditions and inflammation), chloride (natural antiseptic with skin health benefits), and iron (iron-rich springs may support circulation).
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Overview Moser Island Cabin sits on the northern shore of Moser Island in upper Hoonah Sound, 48 miles north of Sitka, Alaska. The wood cabin, built in 1991 by volunteers from Sitka, is available year-round and makes an excellent base for experiencing and exploring this corner of Alaska. This is a remote site. The cabin can be accessed only by floatplane or boat, weather permitting. From Sitka, it's a 30-minute plane ride or a two-hour boat ride. Visitors are responsible for their own travel...
Hot Spring North Arm Peril Strait requires a hike to reach, so pack light but prepared. Cold air temperatures make a changing robe or warm layers essential.
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