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.
History of Hot Spring North Arm Peril Strait
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.
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.
Is Hot Spring North Arm Peril Strait worth visiting?
Best for
- Hot spring soaking
- Backpacking adventures
- Overnight camping trips
Not ideal for
- Day trips with young children
Hot Spring North Arm Peril Strait rewards those willing to make the trek with a more secluded soaking experience.
Annual Precip: 102.4 in
Annual Snow: 191.8 in
January
Air 31°F · Water 100°F · +69° contrast
February
Air 31°F · Water 100°F · +69° contrast
March
Air 33°F · Water 100°F · +67° contrast
January offers 27°F more contrast than July
Recent Temperature
101.3°F
(38.5°C)
Measured Jun 29, 1915
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) and chloride (natural antiseptic with skin health benefits).
Higher mineral concentration for therapeutic soaking
May support bone density and joint health
Known for muscle relaxation and stress relief
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
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...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Sturdy footwear
Trail or off-road approach
Warm layers
Cold air before and after soaking
Camping gear
Nearby camping at Moser Island Cabin
Trash bag
Pack out what you pack in
USGS Quad: (SITKA (D-6) 15) · PP 492: 66.0 · NOAA: 2.0 · AMS Map: SITKA
What is the water temperature at Hot Spring North Arm Peril Strait?
Hot Spring North Arm Peril Strait has a water temperature of 100°F (38°C). This is considered a hot spring, well above body temperature.
Where is Hot Spring North Arm Peril Strait located?
Hot Spring North Arm Peril Strait is located in Sitka City and Borough, Alaska at 141 feet elevation, near Sitka. Coordinates: 57.7710°N, 135.8200°W.
How do I get to Hot Spring North Arm Peril Strait?
Hot Spring North Arm Peril Strait has Backcountry road access (12.7 mi from the road).
Is Hot Spring North Arm Peril Strait free to visit?
Hot Spring North Arm Peril Strait has Open access. It is managed by US Forest Service.
Can I camp near Hot Spring North Arm Peril Strait?
Yes, Moser Island Cabin is located nearby (6.1 miles away).
What minerals are in the water at Hot Spring North Arm Peril Strait?
Water chemistry analysis shows the presence of Total Dissolved Solids, Calcium, Magnesium, Sodium, Sulfate, Chloride. Total dissolved solids measure 786 mg/L.
Is it safe to soak at Hot Spring North Arm Peril Strait?
Hot Spring North Arm Peril Strait is generally safe for soaking at its recorded temperature. Always tell someone your plans before visiting remote hot springs.
Is Hot Spring North Arm Peril Strait crowded?
Hot Spring North Arm Peril Strait requires a hike or off-road travel, which naturally limits crowds. You'll generally find fewer visitors on weekdays and outside peak season.
What should I bring to Hot Spring North Arm Peril Strait?
Essentials for Hot Spring North Arm Peril Strait: swimsuit, towel, water bottle, sturdy footwear for the approach, warm layers for before and after soaking, camping gear, a trash bag to pack out what you pack in.