Harriman State Park lies within a wildlife refuge in the Greater Yellowstone Ecosystem, along the Henry's Fork of the Snake River. Moose, elk and sandhill cranes are common, and so are trumpeter swans, North America's largest waterfowl.
The park was once the Railroad Ranch, the private retreat of the Harriman family of Union Pacific Railroad fame and their partners. For decades the owners protected the wildlife here, and many of the original ranch buildings, from the cookhouse to the horse barn, are still standing and cared for. Summer brings tours of the ranch.
Miles of trails are open for hiking, biking and horseback riding, and in winter they are groomed for cross-country skiing. The "Ranch" section of the Henry's Fork draws fly fishers from around the world.
32°F Partly Cloudy
- Tonight Low 22° Mostly Clear then Patchy Fog
- Thursday High 54° · Low 21° Patchy Fog then Sunny
- Friday High 55° · Low 22° Sunny
Forecast from the National Weather Service, updated 11:32 pm.
Conditions now
Rivers
Henrys Fork near Island Park, ID, 7.3 mi away
- Flow
- 94 cfs
- Change in 24 hours
- -2 cfs
From the U.S. Geological Survey, updated 11:32 pm.
National park alerts and road events
Yellowstone National Park, 48.9 mi away
- Park alerts
- 5
- Closure alerts
- 1
- West Thumb Geyser Basin Boardwalk - Partial Closure (Information): A section of the West Thumb Geyser Basin boardwalk will be closed to Fishing Cone and Lakeshore Geyser through mid-October while crews replace damaged support structures along the shoreline. The remaining sections of …
- Stay Away From Bull Elk (Caution): Bull elk are fast and unpredictable this time of year and can seriously injure people. If an elk charges, run. In addition to staying at least 25 yards (23 m) away from elk and bison, always stay at least 100 yards (9…
- Biscuit Basin Closed Due to Hydrothermal Explosion (Park Closure): The parking lot, boardwalk, and Firehole River at Biscuit Basin, located north of Old Faithful, is closed to all travel until further notice due to the possibility of another event at the site of a hydrothermal explos…
- Traffic Delays - Gardner River High Bridge (Information): Expect a single lane of traffic with up to 15-minute delays, 24 hours a day, seven days a week, from April 1 through late October 2026. Oversized/overweight vehicles (8'6"+ wide, 75'+ long, 80,000 lbs+ gross vehicle w…
- Vehicle Entrance Reservation Not Needed (Information): Although an entrance pass is required to enter Yellowstone National Park, vehicle reservations are not needed. You are encouraged to purchase an entrance pass before arriving, but you may also purchase passes at any e…
From the National Park Service, updated 11:32 pm.
