Mirror Lake Highway RV rental from Salt Lake City

Mirror Lake Highway at a glance

Read from the park’s own pages on 2026-09-19. Limits change, so check the source before you book.

Distance from Salt Lake City

Not published

The Forest Service gives the route in segments, 30 miles of I-80 from Salt Lake City and then 32 miles of SR-150 from Kamas, and never sums them. They are not summed here either.

Drive time

Not published

No source publishes one.

Tightest published length that bars a vehicle

Not published

No road here is closed by length alone.

Listings measured near Salt Lake City

610

610 publish a length, 86 a height, 80 a width.

The hard gate

These are not advisory. A vehicle over any one of them is refused and turned around, and there is nothing to buy that changes the answer.

Maximum length

Not published

Maximum width

Not published

Maximum height

Not published

Maximum weight

80,000 lbs

Maximum combined length

Not published

Three of these five read Not published because UDOT's restriction table carries exactly one entry for SR-150 and it is a weight. Cross-referenced against the 514 usable GVWR values in the measured market: the heaviest listing near Salt Lake City is rated 51,000 lbs, so this gate stops nothing you can rent. That is the finding. The road does not decide this trip.

What is closed to you, in the park's own words

Quoted rather than paraphrased, because a paraphrase of a size limit is how a foot goes missing between the source and the page you read it on.

Campgrounds, and what each one will take

Where a column reads not published, no page published by the agency that runs this ground states a figure. That is the source being silent, not this page being incomplete.

• Mirror Lake Campground. Compiled from the recreation.gov site inventory on 2026-09-19. All 77 sites publish a Max Vehicle Length, from 19 ft to 74 ft, with 13 sites at 30 ft and 12 at 40 ft. Only one site takes 74 ft, so the headline figure describes a single pad. Recreation.gov puts the campground at 10,400 feet, the highest elevation either agency states for anything on the byway. Sites 65 to 79 are equipped for equestrian use with hitching rails and feeding boxes. The Forest Service page states no total.
• Trial Lake Campground. 58 sites, every one carrying a length, from 15 ft to 36 ft, and 28 of them at exactly 30 ft. That 30 ft cluster is not a coincidence: the campground's own booking notice warns that RVs longer than 30 ft may drag on the spillway. The same booking system still sells a 32 ft site and a 36 ft site.
• Washington Lake Campground. 44 sites, all publishing a length, from 20 ft to 105 ft. The longest pads on the byway by a wide margin and the only place up here that will take a 40 ft fifth wheel with room behind it. The Forest Service page for it says four words that matter more than any of that: No water available.
• Moosehorn Campground. 32 sites, all with a length, and the tightest set on the byway taken as a whole: 7 at 20 ft, 11 at 25 ft, 13 at 30 ft and a single site at 35 ft. Nothing here is water or trash serviced, and the Forest Service notes the nearest phone is 17 miles away.
• Soapstone Campground. 33 sites, of which 27 carry a length, from 13 ft to 86 ft. Six publish nothing, so for those the booking page is the only answer. Lower on the highway than the rest, which is why its season runs 5/15 to 9/13, 122 days, the longest on the byway. The Forest Service fee schedule lists a Soapstone RV Comfort Station as a dump station, the only one named on SR-150.

Numbers that do not agree, and who to ask

Both positions are printed. Neither is averaged into a figure no source supports, and neither is quietly dropped.

Questions no official page answers

These are the questions a renter asks that no official page answers. Each one was checked rather than assumed, and a gap is recorded as a gap. Filling one with a plausible number would be the most useful-looking lie on the page.

• Any length, width or height limit on SR-150. UDOT's secondary-highway restriction table carries one entry for the road and it is a weight, 80,000 lbs GVW. Neither UDOT nor the Forest Service publishes a grade percentage, a switchback warning, a hairpin radius or any RV advisory for the climb over Bald Mountain Pass. Checked on 2026-09-19 against the restriction table, the byway recreation page and the Heber-Kamas district page.
• The date the road shuts. UDOT publishes no fixed calendar date for any seasonal road and commits only to "typically November through May or June, depending on the weather". The Soapstone gate and the mileposts repeated on every other page about this highway are not UDOT's words and should not be attributed to it. Watch udottraffic.utah.gov/seasonalroads, which is the page UDOT actually maintains.
• A summit elevation for the highway. The Forest Service's own Bald Mountain Pass Trailhead and Picnic Site page publishes a latitude, a longitude, a fee and no elevation. Recreation.gov puts Mirror Lake Campground at 10,400 feet and Washington Lake Campground at 10,000, and those are the highest figures any agency states for anything on the byway. No agency page read gives a number for the pass itself.
• Whether anything other than Soapstone has a dump station. Soapstone RV Comfort Station appears in the forest's own fee-change table with the site type Dump Station. No Forest Service or recreation.gov page states one at Mirror Lake, Trial Lake, Washington Lake or Moosehorn, and none states that there is not one. With no hookups anywhere on the byway that is the question a week-long booking turns on.
• What length six of the 33 Soapstone sites will take. They publish no Max Vehicle Length at all, so the only way to find out is the booking page or the Kamas office on 435-783-4338. Yellow Pine, Cobblerest and Butterfly publish no length on any site, which is 70 sites on this highway with no figure of any kind.

Sources

• UDOT, secondary highways with additional restrictions
• UDOT, seasonal roads
• US Forest Service, Mirror Lake Scenic Byway
• US Forest Service, Heber-Kamas Ranger District
• Recreation.gov, Mirror Lake Campground
• Recreation.gov, Trial Lake Campground

Salt Lake City RV Rental is a finder. It owns no RVs and is not affiliated with the National Park Service, the Utah Office of Tourism or UDOT. Park rules change between seasons, so read the source before you book.