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Boulder Creek Spring delivers 82-degree Fahrenheit water just 52 feet from Boulder Creek Road near McCall, with an exceptionally high pH of 9.9, among the most alkaline thermal springs anywhere in Idaho. At 3,080 feet elevation, it sits lower than most Idaho springs, in the deep canyon of the South Fork Salmon River drainage.
The spring emerges in a steep, heavily forested canyon in Valley County. Thick stands of ponderosa pine and cedar crowd the road, and Boulder Creek tumbles nearby over moss-covered rock. Despite the relatively low elevation, annual snowfall exceeds 150 inches, and the narrow canyon holds shade and moisture. The warm water seeps from fractured rock right at road level, and the alkaline chemistry leaves a slick mineral film on surrounding stones.
History of Boulder Creek Spring
The extreme alkalinity, pH 9.9, reflects extensive water-rock interaction deep within the Idaho Batholith's granitic mass. As water percolates downward through fractures, it dissolves silica and sodium while shedding calcium, producing the sodium-dominated, calcium-depleted chemistry measured by the USGS. The low chloride at 4.4 mg/L suggests minimal mixing with shallower groundwater, pointing to a relatively isolated deep flow path.
The spring is roadside on Boulder Creek Road with no walking required. Grouse Campground, 18 miles away on Goose Lake near McCall, has reservable sites with canoeing and fishing. Cell service is limited in the canyon. The road may be impassable during spring snowmelt or after heavy rain. Bring drinking water, as the spring water is not potable.
Is Boulder Creek Spring worth visiting?
Best for
- Warm-water soaking
- Easy day trips
- Overnight camping trips
Boulder Creek Spring is well suited for warm-water soaking and easy day trips.
Annual Precip: 38.0 in
Annual Snow: 152.7 in
December
Air 29°F · Water 82°F · +53° contrast
January
Air 31°F · Water 82°F · +52° contrast
February
Air 33°F · Water 82°F · +50° contrast
December offers 44°F more contrast than August
Recent Temperature
80.6°F
(27.0°C)
Measured Jun 03, 1980
The water at Boulder Creek Spring is alkaline (pH 9.9).
pH influences mineral absorption through skin
May support bone density and joint health
Supports circulation and skin hydration
Traditionally used for skin conditions and inflammation
Natural antiseptic with skin health benefits
Overview
Grouse Campground is located just 16 miles from McCall, Idaho, on the shores of Goose Lake. Visitors enjoy canoeing, fishing and horseback riding.
Once on-site, you may be able to pay for your campsite(s) by scanning a QR code using the Recreation.gov mobile app, and the Scan and Pay feature. If this option is available, you will need to first download the free Recreation.gov mobile app https://www.recreation.gov/mobile-app prior to your arrival as some remote areas have limited or...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at Grouse Campground
Trash bag
Pack out what you pack in
USGS Quad: INDIAN MOUNTAIN 7.5 · NOAA: 3.0 · AMS Map: GRANGEVILLE
What is the water temperature at Boulder Creek Spring?
Boulder Creek Spring has a water temperature of 82°F (28°C). This is a warm thermal spring.
Where is Boulder Creek Spring located?
Boulder Creek Spring is located in Valley County, Idaho at 3,080 feet elevation, near McCall. Coordinates: 45.2010°N, 116.3120°W.
How do I get to Boulder Creek Spring?
Boulder Creek Spring has Roadside road access, with the nearest road being Boulder Creek Road (52 ft from the road).
Can I camp near Boulder Creek Spring?
Yes, Grouse Campground is located nearby (11.6 miles away).
What minerals are in the water at Boulder Creek Spring?
Water chemistry analysis shows the presence of pH, Calcium, Sodium, Sulfate, Chloride. The pH is 9.9 (alkaline).
Is it safe to soak at Boulder Creek Spring?
Boulder Creek Spring is generally safe for soaking at its recorded temperature. Access may be on private land or unconfirmed — verify current conditions before visiting. Always tell someone your plans before visiting remote hot springs.
Is Boulder Creek Spring crowded?
Boulder Creek Spring is accessible from a paved road, making it easy to reach. Weekends and holidays may be busier — consider visiting on a weekday for a quieter experience.
What should I bring to Boulder Creek Spring?
Essentials for Boulder Creek Spring: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in.