Twin Pillars Trail: Backpacking Oregon's Ochoco Highlands on a 2-Day Loop

Most Oregon backpackers head straight for the Cascades or the Eagle Cap when they want a weekend in the wilderness. That's fine — those places are spectacular. But it means the Ochoco Mountains sit largely empty, and trails like the Twin Pillars Route in the Mill Creek Wilderness see a fraction of the traffic that identical scenery would attract in a more famous range. If solitude is part of your criteria, pay attention.

The Area: Mill Creek Wilderness, Ochoco National Forest

The Mill Creek Wilderness covers about 17,400 acres east of Prineville in Crook County. It's a ponderosa pine and mixed conifer landscape draped over a rugged volcanic geology — columnar basalt, rimrock, creek-cut canyons, and open ridge meadows. The Ochoco's highest point, Lookout Mountain, is nearby; the Mill Creek drainages that feed off the plateau are perennial, cold, and fishable for wild redband trout.

The Twin Pillars themselves are two dramatic basalt columns that rise from a forested ridgeline roughly 4 miles from the Twin Pillars Trailhead. They're visible from a distance and make a natural destination and turnaround or loop junction.

Getting There

From Prineville, head east on US-26 approximately 9 miles to Ochoco Creek Road (FR-22), then continue northeast on FR-22 and FR-3000 series roads to the Twin Pillars Trailhead near Wildcat Campground. Total drive from Prineville is about 35 miles; the last several miles are on improved gravel roads suitable for most passenger vehicles in dry summer conditions. Check road status with the Ochoco National Forest Supervisor's office in Prineville before departing — late-season logging activity occasionally closes spurs.

The Route

A classic 2-day loop combines the Twin Pillars Trail (Trail #820) with portions of the Mill Creek Trail and a connector. Total mileage varies with your exact loop choice, but a satisfying 2-day itinerary covers approximately 16–18 miles with 2,000–2,500 feet of cumulative elevation gain. Neither day is brutally hard, but the trail is rarely maintained to Cascade standards — expect blowdown crossings, unmarked junctions, and some routefinding.

Day 1: Trailhead to Camp on Mill Creek (8–9 miles)

The first day follows the Twin Pillars Trail east from the trailhead, climbing through open ponderosa pine and Rocky Mountain maple to the columnar basalt formations that give the route its name. The columns appear suddenly as you crest a ridge — a pair of 40-foot basalt spires rising from the timber. Take your time here; it's a genuine Oregon landmark that most people have never seen.

Continue east and north, descending into the Mill Creek drainage. Water is reliable in Mill Creek through July and typically into August in most years, though Ochoco summer heat can reduce flows. Camp on flat ground along the creek near the confluence of the east fork. The fishing here is underrated — wild redband trout hold in every deep pool, and in August evening they rise freely to elk hair caddis and pale morning duns.

Day 2: Mill Creek Loop Return (8–9 miles)

Return via the Mill Creek Trail south along the drainage before climbing out to the ridgeline connector that loops back toward the trailhead. The upper reaches of this return climb offer open ridge views west toward the Cascades — on a clear August day you can pick out the Three Sisters, Broken Top, and the snow-dusted tip of Mounts Jefferson and Hood. It's a surprisingly grand panorama from what most people assume is a "minor" range.

The descent back to the trailhead is through old-growth ponderosa stands with park-like spacing — grass and sage beneath 200-year-old trees, mule deer watching from the shade, woodpeckers working the snags. This is the Ochoco at its best.

Water and Permits

No permits are required for the Mill Creek Wilderness as of 2026. Self-issue permits are available at the trailhead; fill one out even though it's voluntary — the data helps justify funding for these less-visited wilderness areas.

Water is available at Mill Creek and its tributaries. Filter everything — cattle grazing occurs on adjacent private and Forest Service allotments, and E. coli contamination in Ochoco creeks has been documented. A Sawyer Squeeze or BeFree filter is adequate; iodine tablets as backup.

Gear Notes for the Ochoco in August

Footwear: The Twin Pillars Trail is dry and rocky in August. Trail runners are fine; a low waterproof boot works too. No technical terrain.
Water capacity: Carry at least 2 liters between water sources. August sections of the upper ridge can be 4–5 miles of dry trail.
Fire: Check USFS fire restrictions before your trip. Central Oregon fire bans typically go into effect in late July or August and can restrict campfires even in wilderness areas. A stove is mandatory for cooking if fires are restricted; a canister stove with a 110g cartridge is sufficient for a 2-day trip.
Sun: The Ochoco's open ridges get genuine high-desert sun exposure. An ultralight sun hoody, SPF lip balm, and a hat matter more here than they do in Cascade old-growth.
Rattlesnakes: Present in the lower elevations of the Ochoco, especially on south-facing rocky slopes. Watch where you step and where you sit. They're not aggressive, but they're around.

Wildlife and Hunting Season Awareness

The Mill Creek Wilderness holds mule deer and elk throughout summer. August archery season coincides with peak backpacking weather — if you're on the trail in late August or September, wear blaze orange on your pack or as a bandana. The wilderness is closed to motorized vehicles but open to archery hunting, and you may share the trail with bowhunters glassing for deer. It's not a conflict, just good practice to be visible.

Black bears are present in the Ochoco. Hang food or use a bear canister — the Ochoco bears are not habituated to people but will investigate an unattended pack. A BearVault BV500 fits cleanly in most 50L packs and provides solid protection.

Fishing the Mill Creek Drainage

Bring a 3-weight or 4-weight fly rod if you have one — or a small ultralight spinning rig. The redband trout in Mill Creek are wild, beautiful, and surprisingly willing in summer evenings. They're not large — 8 to 12 inches is typical — but they're aggressive and numerous. A size 16 elk hair caddis or a size 14 royal Wulff fished in the pockets and runs will produce fish consistently from 7 PM until dark. Catch and release on wild redbands is not required in the Ochoco, but it's the right call.

The Bottom Line

The Twin Pillars loop gives you wilderness solitude, genuine scenery, good water, fishable trout, and wildlife — all within two hours of Bend and three from Portland. For a 2-day summer trip without the permit hassles, trailhead crowds, or reservation anxiety of the Three Sisters or Eagle Cap, the Ochoco punches far above its reputation. Go before it gets discovered.