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Mcgrew Trail

Saturday, February 10, 2024

Other Names

O'brien, Siskiyou National Forest, Grants Pass, Oregon Caves, Sourdough, Sourdough Camp, Mcgrew 4wd Trail, Rock Creek, Elk Creek, Illinois River, Biscuit Creek, Cedar Springs

Last Known StatusVariable Schedule  (special use permit required)

This is a remote area that mainly consists of gravel roads and 4x4 trails. The climbs are gradual (not too steep) but some sections of the trail are pretty rocky. There is a nice staging and camping area next to the stream on the left main entrance at N42.01.615 W123.46.079. You can stage here or drive further. Follow the main road up the mountain, past the gravel pit, and bear right at the fork (go through the yellow gate) and look for a large unmarked open area on the right. This is the actual trailhead.

The trail is primarily traveled from east to west, ending near Sourdough Camp. Sourdough Camp can also be reached by heading about five miles south past McGrew Trailhead on Lone Mountain Road and taking the turnoff for NF-4402/Wimer Road heading west.

Visitors should be aware that this trail is only open to OHVs with a special use permit. The trail also has seasonal closures to help reduce the spread of Port Orford Cedar Root Disease. Those looking for rocky 4x4 trails that don't require a special use permit should check out Rattlesnake Ridge, which is about an hour south off 199. Dirt bike riders should check out High Dome or Elk Camp Ridge.

Some other recommended activites in the area are the Oregon Caves National Monument (north on 199), and the redwood forest (10-15 miles south on 199).

Trail Map... Nearby ATV Trails...


Permit RequiredYesOregon ATV Permit stickers required
Dates OpenSpecial use permit required - contact Siskiyou National Forest for details.
Other ATV Stickers AcceptedYesAn operating permit issued for another state will be honored, but only if the issuing state also honors Oregon operating permits. (As of October 1, 2021, Oregon no longer honors stickers from Washington.) (AZ, CA, ID, IN, MO, NV, PA, SC, UT, VT)
Spark ArrestorYesA spark arresting exhaust silencer or end cap is required for all vehicles.
Noise LimitYes (99 dB)Oregon ATV noise limits apply (all vehicles limit 99 dB)
Whip FlagsNot Required
Maximum Vehicle WidthNo Restriction
Allow Dirt Bikes, Trail Bikes and Motorcycles Motorcycles & Dirt BikesCertain Timesspecial use permit required
Allow All Terrain Vehicles / Quads / Four Wheelers ATVsCertain Timesspecial use permit required
Allow Utility Terrain Vehicles, Side by Sides (SXS), RZR UTV & SXSCertain Timesspecial use permit required
Allow 4x4 Jeeps, SUVs and 4 x 4 Trucks with License Plates 4x4 & Jeeps (registered)Certain Timesspecial use permit required
Dune Buggy & Sand Rail
4x4 (unregistered)
Some AreasOregon ATV Permit stickers required
special use permit required
2 Stroke EnginesCertain Timesspecial use permit required
MX Helmet RequiredYouth Onlyrequired for persons under 18 by state law
(RiderPlanet strongly recommends helmets for all riders.)
Camping / Overnight RV Parking CampingNo Restriction(camp anywhere)
Campfire Restrictions CampfiresNo Restriction
Night RidingUnknown
Trail BlazingProhibitedkeep on the trail
AlcoholNo Restriction
Rule EnforcementFew/Periodic


Approx Size384,000 acres (600 sq mi)
Miles Of Trail29
Climate TypeForest
Elevation1666 to 3940 ft.
Trail MaintenanceNot Marked, Not Rated, Not Maintained
Loose DirtThis trail has little loose dirt.Little
Hard PackThe trail has some hard pack terrain.Some
SandThis trail has little sandy areas.Little
MudThe trail has little mud after it rains.Little
DustThe trail has some dust on typical days.Some
RocksThis trail has mostly rocks.Mostly
TreesThe trail has almost all trees.All
Steep HillsThis trail has few steep hills.Few
Water CrossingsThe trail has few water crossings.Few
Small JumpsThis trail has some small jumps.Some
Large JumpsThis trail has no large jumps.None
BermsThe trail has no berms.None
Sand/Gravel PitsThis national forest has few sand or gravel pits.Few
Single TrackThis national forest has no single track trails.None
RoadsThis national forest has mostly roads.Mostly
IntersectionsThis trail has few intersections.Few
Rider TrafficThe national forest has few rider traffic on typical days.Few
ShadeThis national forest has many shaded areas.Many
Ranges/GunfireThis national forest has no shooting ranges or gunfire.None
HazardsThis trail has few hazards.Few(hazards not marked)
Easy Terrain NoviceThis trail has some beginner terrain.Some
Moderate Terrain AmateurThis trail has mostly intermediate level terrain.Mostly
Difficult Terrain ExpertThis trail has little expert terrain.Little
Commentmostly gravel roads & rocky jeep trails


AreaMotorized Trails, Gravel Pit
LandNational Forest


Gasoline Gasoline5-20 Miles (N)Chevron (541) 592-3080
Diesel Diesel5-20 Miles (N)Chevron (541) 592-3080
Potable Water Water1-5 Miles (NE)Mountain Man RV Park (541) 592-2656
RV Hookups RV Hookup1-5 Miles (NE)Mountain Man RV Park (541) 592-2656
RV Dump Station RV Disposal1-5 Miles (NE)Mountain Man RV Park (541) 592-2656
Primitive Camping CampgroundOn Site
Convenience Store Conv Store5-20 Miles (N)Speedy Mart & Deli (541) 592-2814




Prosvery remote, good scenery, nearby sight seeing, swimming/fishing holes, free camping
Consrocky, mostly gravel roads & jeep trails
Our RatingRatingVery Good
Recommended StayFull Day
Comments(Scroll Down For Rider Reviews & Comments)


Nearest CityO'Brien, OR
AddressLone Mountain Road, O'Brien, OR 97534
Go Back To Oregon List
Trail MapGo To Trail Map
From: Grants Pass, OR
1) Take 199 South to O'Brien (very small town)
2) Take a right in the middle of town
3) Turn right (west) on Lone Mountain Road (Country Road #5550)
4) Proceed approx 4 miles to National forest entrance - stage anywhere
5) Main trail head is another 5-6 miles ahead - veer right on 4402-19 fork - continue up hill to open area (trail head clearing).


Contact InfoSiskiyou National Forest - Wild Rivers Ranger District
26568 Redwood Hwy
Cave Junction, OR 97523
(541) 592-4000
(541) 471-6500
Contact InfoOregon ATV Safety Education Card
(877) 772-3359
Contact InfoOregon State Parks Online Store
725 Summer Street NE, Suite C
Salem, OR 97301
(800) 551-6949


Mcgrew Trail Photo

Mcgrew Trail

This photo was taken near the main trailhead.  The road is wide and fairly easy to start.  It gets a little bit more narrow and rocky as you go but nothing too challenging.

Mcgrew Trail Photo

Scenic view of shallow stream flowing over river rocks surrounded by pine trees.

You will cross over this small stream on the way in.  Great scenery, crystal clear water.

Mcgrew Trail Photo

Scenic view of forest and 4x4 trail.

One of many scenic panoramic views to be had from the main trail.  First time ATV riders could have a blast.

Mcgrew Trail Photo

Suzuki RM 100 two-stroke dirt bike going up small gravel hill.

There is a small gravel pit or play area along the main road.

Mcgrew Trail Photo

Suzuki RM250 two-stroke going over downed tree that is blocking the trail.

There are numerous side roads that dead end quickly.  After taking a couple you'll realize that none of them go anywhere.

Mcgrew Trail Photo

Close up photo of shallow stream surrounded by large river rocks.

This small creek is the perfect place to cool off, but watch out for the crayfish that lurk at the bottom!  You can stage very near where this photo was taken.

Mcgrew Trail Photo

Suzuki RM250 two-stroke going down trail in gravel pit.

Another shot of the play area at the gravel pit.  It was fun enough to mess around for a few minutes.

Mcgrew Trail Photo

Young woman wearing Acerbis riding gear and Chatterbox radio attached to motorcycle helmet sitting on RM100 dirt bike.

This is a bridge crossing for the stream along the main road.  We didn't know the area so we staged right near the entrance.

Mcgrew Trail Photo

Suzuki RM100 dirt bike riding down rocky 4x4 trail.

Some of the side roads get very little traffic.  There were alot of downed trees and dead ends.

Mcgrew Trail Photo

Aerial view of gravel pit and forest scenery.

This is a view from the hill top at the gravel pit.  You can see the main road in the distance.

Mcgrew Trail Photo

RM100 dirt bike on rocky 4x4 trail.

Smooth and easy, these are great trails for beginners or ATV sight seeing.

Mcgrew Trail Photo

Rider wearing CamelBak on RM100 going through segment of 4x4 trail.

This was a typical fun section in the first mile of the main trail.  Lots of turns with slight climbs and dips.  Not too many rocks.


Mcgrew Trail Photo

Forest scenery with Suzuki RM 100 two-stroke dirt bike.

Another scenic view from the main road.

Mcgrew Trail Photo

View of hardpacked trail with loose chunk rock.

Some sections of the trail are a bit rocky.  It gets rockier than this too, but not really difficult or steep.

Mcgrew Trail Photo

View of forest and mountains from the trail.

This place may not be the single track twisty that you were hoping for but still, it is a gorgeous ride.

Mcgrew Trail Photo

Suzuki RM250 dirt bike navigating a rocky 4x4 trail.

The area is so remote that many of the roads get little trafffic.

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