George Washington State Forest Mille Lacs Spillway Technical Loop
Granite boulder field with industrial ruins
This isn’t your typical Minnesota forest road — the Spillway Technical Loop threads through a landscape of house-sized granite boulders left behind by the last ice age, creating natural obstacles that’ll challenge even built rigs. The route follows old logging skidder paths that wind around massive pink granite formations, some stacked so precariously they look ready to topple. The centerpiece is the abandoned spillway construction site from the 1940s, where rusted machinery and concrete footings create an eerie industrial graveyard in the middle of pristine wilderness.
This is difficult terrain that demands serious rock crawling skills — articulation, low-range gearing, and rock sliders aren’t optional here. Summer months offer the best conditions when you can actually see the granite you’re climbing over. No permits needed, but notify the state forest office of your plans since rescue would be complicated in this remote area. What you get is some of the most technical four-wheeling in the Midwest, plus a glimpse into Minnesota’s forgotten industrial history that most people never knew existed.
Trail Specs
| Difficulty | Difficult |
|---|---|
| Trail Type | Technical 4x4 |
| Surface | Rock |
| Features | Historic, Remote |
| Length (miles) | 8 mi / 12.9 km |
| Duration | Full day |
| Max elevation (ft) | 1420 ft |
| Best season | June-September |
| Minimum vehicle | Modified 4WD with armor |
| Nearest town | Milaca, Minnesota |
| Land manager | Minnesota DNR |
| Permit required | No |
| Cell service | None |
| Water crossings | No |
| Dispersed camping | No |
| Start coordinates | |
| End coordinates | |
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| Find on Google | Search on Google → |
Location
Trail Conditions
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Frequently asked questions
What kind of vehicle modifications do I need for this granite boulder field?
You'll need rock sliders, skid plates, and aggressive tires minimum. Stock vehicles will get body damage on the sharp granite edges.
Is this trail accessible in spring or fall?
Best June-September when ground is dry. Spring melt makes granite slippery and dangerous, while fall brings early ice risk.
Do I need permits to run this loop in George Washington State Forest?
No permits required, but Minnesota DNR requires vehicles stay on designated trails. It's free to access.
What's the gnarliest obstacle on this technical loop?
The main granite shelf climb near the spillway ruins - it's a commitment move with no bypass and requires precise line choice.
Should I bring extra fuel for this 8-mile loop?
Yes, the technical crawling burns more fuel than normal driving, and Milaca is your only fuel stop for miles around.