A rugged 3-day loop through the San Juan Mountains, connecting Silverton, Ouray, and Lake City via high-alpine passes and classic 4x4 trails. Best for lifted builds with lockers — some sections hit 13,000+ ft.
Difficulty ›
Challenging
Duration › 3 days
Total › 165 miles
Engineer Pass and Cinnamon Pass both have loose shale and shelf roads. A JK Wrangler with 35s and lockers handles this comfortably.
Day-by-Day
D1
Silverton to Engineer Pass
48 mi drive ·
Challenging
›
Highlights
Cross Engineer Pass at 12,800 ft with panoramic views of the Uncompahgre Wilderness
Stop at the ruins of the Frank Hough Mine — surreal alpine ghost town
Wildflower meadows in American Basin peak in late July
Trails / roads
Engineer Pass Road (CR 20)
American Basin Spur
Campsites
DISPERSED
American Basin Dispersed
14-day limit, first-come. Sites fill by Thursday in summer.
DEVELOPED
Ouray KOA
Full hookups available if you prefer a shower night 1
Fuel stops
+0mi
Silverton (start)
+45mi
Ouray
D2
Ouray to Cinnamon Pass
62 mi drive ·
Challenging
›
Highlights
Cinnamon Pass at 12,620 ft — dramatic descent into the Lake Fork of the Gunnison
California Gulch offers a quieter side route with waterfall views
Afternoon thunderstorms typical — be off exposed ridges by 1pm
Trails / roads
Cinnamon Pass Road (CR 3)
Wager Gulch
California Gulch
Campsites
DISPERSED
Bureau of Land Management — Lake Fork
Flat pull-through sites along the river. Popular with overlanders.
Fuel stops
+58mi
Lake City
D3
Lake City Back to Silverton via Slumgullion Pass
55 mi drive ·
Moderate
›
Highlights
Slumgullion Earthflow — active landslide visible from the road, unique geology stop
Spring Creek Pass trailhead for a short hike to Continental Divide views
Easier day lets you air tires back up and decompress before the drive home
Trails / roads
CO-149 (paved)
Slumgullion Earthflow Overlook
Spring Creek Pass area
Campsites
DEVELOPED
Wupperman Campground (Lake City)
Reservable, flush toilets. Good option if you want a final night before driving home.
Fuel stops
+0mi
Lake City (morning fill-up)
+40mi
Creede
Gear Checklist
REC
Bear canister
San Juan bear activity is low but best practice for dispersed camping
REC
Paper topo maps
No cell service; Gaia GPS offline download also works
MUST
High-lift jack
Shelf roads with soft shoulders — essential for recovery on narrow passes
MUST
Traction boards (x2)
Loose shale on Engineer Pass descent can require board assist
MUST
12V air compressor
Air down for the loose stuff, air back up before the highway return
MUST
Snatch strap + D-rings
Rocky recovery terrain — factor for extraction without anchor trees
MUST
First aid kit (wilderness-rated)
30+ miles from cell service on both passes
MUST
Layering system (20F nights)
Alpine nights drop hard even in summer — 13k ft
MUST
Water filter / extra water (2 gal/person)
No water at dispersed sites; streams need filtering
MUST
Spare tire (full-size)
Shale and sharp rock on Cinnamon Pass — flats are common
Rig Warnings
⚠Engineer Pass and Cinnamon Pass have narrow shelf road sections — no passing pullouts every 0.5 mi. If meeting traffic, the uphill vehicle has right of way.
⚠Afternoon thunderstorms at altitude are severe. Be at or below treeline by 1pm. Lightning above 12,000 ft is a real hazard.
⚠Fuel planning is critical — last reliable gas before the loop is Ouray or Silverton. Lake City has one station. Range anxiety is real here.