Union Falls via Mountain Ash Creek

Starting your journey near Teton County, Wyoming, the Union Falls via Mountain Ash Creek trail is an approximately 30 km (18.6 miles) out-and-back adventure with an elevation gain of around 800 meters (2,625 feet). This medium-difficulty trail offers a blend of natural beauty, significant landmarks, and a touch of historical intrigue.### Getting There
To reach the trailhead, you can drive or use public transport. If driving, head towards the Ashton-Flagg Ranch Road, also known as Reclamation Road, which is accessible from both the Wyoming and Idaho sides. The nearest significant landmark is the Flagg Ranch, located just south of Yellowstone National Park. For those relying on public transport, the closest major hub is Jackson, Wyoming. From Jackson, you can take a shuttle service to Flagg Ranch, where the trailhead is a short drive away.### Trail Overview
The trail begins with a gentle ascent through lush meadows and dense forests. Early on, you'll cross Mountain Ash Creek, a serene waterway that sets the tone for the natural beauty you'll encounter. The first 5 km (3.1 miles) are relatively easy, with an elevation gain of about 150 meters (492 feet), making it a good warm-up for the more challenging sections ahead.### Significant Landmarks and Nature
As you progress, the trail becomes steeper and more rugged. Around the 10 km (6.2 miles) mark, you'll reach the first major landmark: Scout Pool. This natural pool is a great spot to take a break and enjoy the surrounding scenery. The elevation gain here is approximately 400 meters (1,312 feet), so you'll have climbed half of the total elevation by this point.Continuing on, the trail winds through a series of switchbacks, offering panoramic views of the Teton Range. Keep an eye out for local wildlife, including elk, deer, and the occasional black bear. It's advisable to carry bear spray and know how to use it.### Union Falls
The highlight of the trail is, of course, Union Falls. Located around 15 km (9.3 miles) from the trailhead, this stunning waterfall is one of the largest in Yellowstone National Park, cascading nearly 80 meters (262 feet). The falls are named for their unique formation, where two separate streams unite to create a powerful, singular waterfall. This area is perfect for photography and a well-deserved rest before heading back.### Historical Significance
The region around Union Falls has a rich history. It was originally inhabited by Native American tribes, including the Shoshone and Bannock peoples, who used the area for hunting and gathering. In the late 19th century, the area became part of the early explorations that led to the establishment of Yellowstone National Park. The trail itself has been used for decades by hikers and naturalists drawn to its unique beauty and geological features.### Navigation and Safety
Given the trail's length and elevation gain, it's crucial to be well-prepared. Use HiiKER for accurate navigation and trail conditions. Ensure you have enough water, food, and appropriate clothing for changing weather conditions. The trail can be muddy and slippery, especially after rain, so sturdy hiking boots are recommended.### Return Journey
The return journey follows the same path, offering a different perspective on the landscapes you traversed earlier. The descent is generally easier, but still requires caution, especially on the steeper sections.By the time you return to the trailhead, you'll have covered approximately 30 km (18.6 miles) and experienced an elevation gain of around 800 meters (2,625 feet), making for a rewarding and memorable hike.