Union Falls

Overview

Tucked in the park’s Bechler “Cascade Corner,” Union Falls fans out in a dramatic ~250–260‑foot curtain where two forks of Mountain Ash Creek meet at the brink. The region’s high precipitation feeds lush forests, meadows, and an outsized number of waterfalls—this one is among the most striking and far less crowded than roadside sights.

Getting There

Most hikers start from the Cascade Creek Trailhead off Grassy Lake Road, reached by driving past the South Entrance to Flagg Ranch and then west. After the initial pavement, the road turns rough, washboarded, and is seasonal—mud, snow, or closures can linger into early summer. The trail itself is well‑marked.

The Hike

Plan on 15.5–16 miles round trip with little elevation gain overall (<1,000 ft), but expect a full‑day effort. Common day-hike times range 7–11 hours depending on river levels, pace, and stops. You’ll cross creeks and must ford the Falls River (ankle to thigh deep later season) over slippery cobbles; trekking poles and wading shoes make a big difference. The final mile to the viewpoint is sandy and steeper. Around 6.5 miles in sits the small Union Falls Ranger Station with a picnic bench. The standard viewpoint is superb; descending to the base is not advised—it's steep and wet.

Ouzel (Scout) Pool

A short side spur (about a mile total add‑on) leads to a lukewarm pool where a warm spring mixes with the creek—great for a mid‑hike soak. Use caution: currents can be strong where the warm water enters the flow.

Season and Best Time to Visit

Late July through September is the sweet spot: water levels drop for safer fords, and the road and trail usually dry out. Early season (even June) can mean high, cold, hazardous fords and lingering mud or snow. Mosquitoes and horseflies can be intense—especially mid‑summer—so bring repellent. Start at dawn to beat afternoon storms and give yourself a generous turnaround time. Crowds are typically light even in peak season.

Wildlife and Backcountry Notes

This is prime bear country with frequent sign—carry bear spray, make noise, and follow food‑storage rules. Huckleberries often ripen in August. Designated backcountry campsites exist in the area (permit required via the Bechler Ranger Station). There’s no reliable cell service.

Essentials and Safety

• Footwear: Bring wading shoes/sandals and trekking poles for fords; unbuckle your hip belt when crossing.
• Water/food: Carry ample water or a filter and high‑calorie snacks; this is a long day.
• Services: Don’t count on restrooms at the trailhead or along the route.
• Conditions: Check current road, trail, and fire status with the National Park Service before you go.

Why Go

Union Falls delivers a top‑tier Yellowstone waterfall experience without the crowds, plus the rare bonus of a warm‑spring swim nearby—well worth the effort if you’re up for a big day.