Arizona Hot Spring (Ringbolt Hot Spring)

Overview

Hidden in Black Canyon just south of Hoover Dam, Arizona (Ringbolt) Hot Spring rewards a rugged desert hike with a series of natural soaking pools tucked inside a narrow slot. Most hikers do a roughly 6‑mile loop with 750–1,100 feet of gain, and it feels strenuous thanks to loose gravel, steep scrambles, and one memorable 20‑foot ladder. Figure 3–5 hours of hiking plus soak time.

The Soak

Several pools cascade through the slot, typically hottest upstream and cooler downstream. Water commonly runs around 111–120°F, and the springs discharge an estimated 30–50 gallons per minute. These are free‑flowing pools—don’t alter them with sandbags or dams. Pit toilets sit about 200 yards downstream along the river for sanitation; pack out all trash and follow Leave No Trace.

Getting There & Route

Park at the White Rock Canyon lot off US‑93. There are two main approaches that combine nicely into a loop: the lower White Rock Canyon route and the higher Arizona Hot Spring Trail. Many hikers go river first, then climb UP the ladder through the hot‑spring slot to reach the pools before exiting on the upper trail—ascending the ladder generally feels safer. Expect sandy washes, occasional route‑finding, and color‑marked junctions in places.

What to Bring

Plan for desert conditions even in cool months. Carry plenty of water (3 liters per person in cool weather is a good baseline) and electrolytes—the hot soak dehydrates you. Grippy hiking shoes plus water shoes or sandals help on slick, wet rock. Layers are smart; winter canyons are shady and breezy. Download a map/GPS; cell service is spotty to none.

Safety Essentials

Heat is the main hazard—these routes are typically closed May 15–September 30 for a reason. Start early on sunny days, watch for flash‑flood potential after storms, and move carefully on wet rock and the ladder. The wash is sandy and slow going. Rattlesnakes are possible, especially in warmer months.

Geology & Backstory

You’ll hike through striking volcanic terrain with ash layers and scattered granite boulders washed down the canyons. The hot water rises along faults and fractures before spilling into the slot. The “Ringbolt” name nods to the era before Hoover Dam, when steamboats were winched up Black Canyon using iron ringbolts anchored in the rock near the river.

Best Time to Visit

Prime season is fall through early spring when the area is open. Aim for weekday mornings to beat crowds and claim space in the pools; the slot stays shaded much of the day, which keeps winter air cool but makes the soak feel great. On busy weekends the medium‑sized parking lot fills—arrive early.