Three Island Crossing State Park is a public state park in Idaho near Glenns Ferry in Elmore County. Spanning 613 acres and established in 1971, this park offers a peaceful retreat into nature for visitors of all ages.
Quick Facts
| State | Idaho |
| Nearest City | Glenns Ferry |
| County | Elmore |
| Park Size | 613 acres |
| Established | 1971 |
| Google Rating | ⭐ 4.5/5 (600 reviews) |
Location & Getting There
Three Island Crossing State Park is located near Glenns Ferry, Idaho. The park’s coordinates are 42.9447, -115.3180.
Things to Do
Idaho state parks showcase the rugged beauty of the Northern Rockies and high desert — from alpine lakes and dramatic canyons to volcanic landscapes and whitewater rivers. Activities include hiking through mountainous terrain, swimming and boating on pristine alpine and reservoir lakes, fishing for rainbow and cutthroat trout in clear mountain waters, camping in remote forested settings, mountain biking challenging terrain, cross-country skiing in winter, whitewater rafting on renowned rivers, and exploring natural hot springs and volcanic formations.
Best Time to Visit
Summer (June–August) is peak season with warm days, open mountain trails, and excellent lake recreation. Fall (September–October) brings golden aspens and larches to the forests and fewer crowds. Spring is muddy at higher elevations but great for waterfall viewing and fishing as rivers swell. Winter transforms mountain parks into cross-country skiing and snowmobiling destinations. Northern Idaho parks have shorter seasons due to heavier snowfall.
Visitor Tips
Idaho state parks charge a vehicle entry fee ($7/day or $40/annual). Camping reservations through the Idaho State Parks reservation system up to 9 months in advance. Many parks are remote with limited cell service and amenities — come prepared. Bear country protocols apply in northern Idaho parks. Water levels on reservoir parks fluctuate significantly during drawdown seasons.
Frequently Asked Questions
How much does it cost to visit Idaho state parks?
Idaho state parks charge a motor vehicle entrance fee (MVEF) of $7 per vehicle. An annual Idaho State Parks Passport costs $40 and covers unlimited entry to all parks.
What are the best state parks in Idaho?
Top parks include Bruneau Dunes (tallest single-structured sand dune in North America), Harriman (wildlife refuge near Yellowstone), Farragut (on Lake Pend Oreille), and Thousand Springs (dramatic canyon springs).
Can I see sand dunes in Idaho?
Yes, Bruneau Dunes State Park features the tallest single-structured sand dune in North America at 470 feet. The park also has an excellent observatory for stargazing and is a designated Dark Sky Park.
What is the best time to visit Idaho state parks?
Summer (June-August) is peak season for water recreation and camping. Fall brings beautiful colors to the mountainous parks. Spring offers wildflowers and rushing waterfalls. Many parks remain open in winter for snow activities.
Explore More Idaho State Parks
Three Island Crossing State Park is one of many outstanding state parks in Idaho. Discover more parks in our Best State Parks in Idaho guide, or use our Park Finder to search by activity, location, or features.
Make it a road trip: Pair a visit with Glenns Ferry Historical State Park (a short drive away) or Bruneau Dunes State Park (within about an hour’s drive).
Park Location
Plan your gear for Three Island Crossing State Park
From our editorial guides, matched to this park’s activities:
