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The site details and map below come from the public Recreation.gov record and are accurate. For current dates and to book, go to Recreation.gov.
Only 1 opening in the last 90 days: not enough recent activity for a reliable pattern. A free Campsite Sniper alert watches around the clock instead, and pings you the moment one opens.
Thompson Flat Campground is located high in the Albion Mountain Range of southern Idaho, near the towns of Declo and Albion. Visitors enjoy the area for its abundant trails, alpine lakes and scenic beauty.
The Twin Lakes Campground area is located just outside the campground and across the road. It offers picnic areas, horse corrals and access to a variety of trails.
Lake Cleveland is a two-mile drive from the campground, offering fishing, canoeing and trail opportunities. Several additional hiking, mountain biking, horse and off-road vehicle trails are on the mountain.
The campground contains three group sites, which can accommodate from 40 to 64 people, respectively. All sites are equipped with large picnic tables and campfire rings with grills. There are four reservable single units and four double unit campsites as well as 17 additional single-family campsites that are available on a first-come, first-served basis, but the group sites must be reserved.
Accessible vault toilets are provided. A campground host is located on-site. Roads and parking spurs within the campground are gravel.
The campground is situated in a beautiful wildflower-filled meadow lined with tall pine and fir trees, on the eastern slope of Mount Harrison. It sits at an elevation of 8,400 feet.
A visit up the road to the Mount Harrison Lookout offers interesting area information and breathtaking panoramic views of the valleys below.
Pomerelle Ski Area, just below Thompson Flat, offers lift-served hiking and mountain biking, scenic chairlift rides and a few dining options, generally on weekends.
From Interstate 84, take exit 216 and follow State Highway 77 south for approximately 18 miles, through the towns of Declo and Albion, to Howell Canyon Road. Turn west at the Pomerelle Ski Area sign and drive seven miles up the canyon on Howell Canyon Road. The road is steep and winding, watch for the campground entrance sign on the right.
View on Recreation.gov ↗ Get directions ↗












Online reservations for this facility, where offered, are made through Recreation.gov. Campsite Sniper has also detected 1 site opening here in the last 90 days, so further dates may appear. Pick a site on the map to see its calendar, or set a free Campsite Sniper alert. You complete the reservation yourself on Recreation.gov.
No. Campsite Sniper sends alerts and direct Recreation.gov links. It never books, pays for, holds, hoards, or resells reservations.
Campsite Sniper does not currently hold availability data for Thompson Flat, so there is nothing to date here. That is a gap in coverage — it does not mean the facility is full or closed. Check Recreation.gov for current dates.
Campsite Sniper detected 1 site-date opening here over the last 90 days, none in the last 7. A free alert watches around the clock and pings you the moment one appears.
11 of the 11 sites that support RV analysis have a recorded maximum of 35 ft or more; the longest recorded is 60 ft.
Lakefront, hookups, your RV length, weekends only - set it as picky as you want.
We run paced availability checks for Thompson Flat. One watch covers every matching site.
When a match opens, you get a push with a Recreation.gov link so you can review and book it yourself.