Oregon has no shortage of famous wilderness areas, which means the less-famous ones get almost entirely ignored. The Mill Creek Wilderness, a 17,400-acre roadless area in the Ochoco National Forest east of Prineville, is exactly that kind of place. No crowds. No Instagram hordes at the trailhead. Just old-growth ponderosa pine, the sound of Mill Creek over volcanic cobbles, and a pair of 200-foot basalt spires—Twin Pillars—rising out of the canyon like something out of a different landscape entirely.

For backpackers willing to drive the Ochoco Highway and accept a few miles of moderate terrain, this is one of the most rewarding overnight destinations in central Oregon.

Getting There

From Prineville, take US-26 east approximately 9 miles to Ochoco Creek Road (Forest Road 22). Follow FR 22 north about 10 miles to the Mill Creek trailhead parking area. The road is paved most of the way and easily navigated in a standard passenger vehicle during summer. Cell service ends before the trailhead—download your maps in advance.

No permit is currently required for overnight camping in the Mill Creek Wilderness, though ODFW and Forest Service check regulations before you go, as this can change.

The Loop: Twin Pillars to Wildcat Camp

The standard weekend loop covers approximately 17 miles round-trip using the Twin Pillars Trail and the Belknap Trail to create a lollipop route. Here's the breakdown:

Day 1: Trailhead to Twin Pillars (9 miles, 1,200 feet gain)

The Twin Pillars Trail follows Mill Creek upstream through a riparian corridor of old-growth ponderosa pine, scattered fir, and cottonwood along the stream bottom. The trail crosses Mill Creek multiple times—expect wet feet in early summer or use the log crossings when water is low in July and August. The canyon walls rise steadily as you move upstream, transitioning from open pine forest to tighter volcanic terrain.

At mile 6, the Twin Pillars come into view: two massive basalt columns separated by a narrow slot. The formation is genuinely striking in a landscape that otherwise doesn't prepare you for it. Camp in the established sites near the pillars or continue another mile to Wildcat Spring, where reliable water is more consistently available in late summer.

Day 2: Twin Pillars to Belknap Trail Loop Return (8 miles)

The Belknap Trail returns along the south ridge of the Mill Creek drainage, offering a completely different perspective on the wilderness—open ridgetop walking with views across the Ochoco highlands and down into the canyon you hiked yesterday. The terrain is drier and more exposed, so start early to beat afternoon heat. The trail rejoins the Twin Pillars Trail approximately 3 miles from the trailhead for a straightforward return.

Water and Camp Setup

Mill Creek runs year-round in normal precipitation years, but by late July the stream can be reduced to isolated pools in its upper reaches. Filter all water—the Ochoco has grazing allotments and cattle can be present in certain areas. A gravity filter or squeeze system works fine; no need for a pump in this terrain.

Camp at least 200 feet from water sources and 200 feet from the trail, consistent with Leave No Trace principles for wilderness camping. Established fire rings exist near Twin Pillars; check current fire restrictions before you go—central Oregon fire danger runs high in July and August, and campfire bans are common.

Wildlife and What to Expect

The Mill Creek drainage supports a healthy population of mule deer, which you'll likely see in the morning hours feeding in the meadow pockets along the creek. Elk use the area seasonally—look for sign in the wetter canyon bottom sections. Black bear are present but rarely encountered; standard food storage practices apply. Rattlesnakes inhabit the warmer, rocky sections of the Belknap Trail return route—watch your step on the ridgetop sections and don't put your hands anywhere you can't see.

Birdlife is a highlight. The old-growth ponderosa hosts white-headed woodpeckers, a species of special interest that prefers exactly this kind of large-diameter, open-canopy pine forest. Bring binoculars.

Gear Notes for the Ochoco Summer

• Water: Carry at least 2–3 liters capacity. Sources can be unpredictable in late summer.
• Sun protection: The ridgetop sections of the return offer no shade. Hat, sunscreen, and lightweight long sleeves are not optional in July.
• Footwear: Trail runners work well for the main canyon trail; the rocky ridgetop benefits from a more supportive boot.
• Navigation: The trail is generally well-marked but intersections can be confusing. Download the Ochoco National Forest layer in CalTopo or OnX before leaving cell range.
• Pack weight: For a one-night trip, aim for a pack under 30 pounds including water. The trail is moderate, not brutal, but heat and elevation combined with a heavy pack will end your fun.

Why It's Worth It

The Mill Creek Wilderness won't make anyone's Oregon bucket list of iconic destinations. It's too close to Prineville, too easy to access, and too lacking in the photogenic alpine drama that drives modern outdoor recreation marketing. What it has instead is solitude, old trees, a canyon that rewards slow travel, and those two basalt pillars standing in the middle of the pines like they've been waiting for someone to notice them.

Sometimes the best backpacking trips are the ones where you have the trail entirely to yourself.