4x4 Trail Info
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Rating Systems:

4x4TrailInfo
Arizona
Arizona Land Rover Rally
ASA4WDC
AZ Rockcrawler.com
AZVJC
BadAss
Black Hills 4 Wheelers
Black Hills Jeeps
C.O.R.E.
CA Parks
Californiajeeper.com
Colorado
DVO
Expeditions West
Extreme4x4
GLFWDA
Jeep Jamboree
JonFund
Massey/Wilson
Moab
Nevada
Northern4x4
ORN
Sedona
SITR
Tellico
TTORA - NorCal
USFS
Vermont
Wells
Yuma

Californiajeeper.com
Trail Rating System

This is the system used by californiajeeper.com.

1-31-3feature trails with obstacles that are easy to navigate. In optimum weather conditions, some of these trails may not require the continual use of four-wheel drive (4WD).
4-74-7are moderately demanding trails on which 4WD is required. You may encounter a wide variety of challenges, including mud holes, boulders, and stream crossings, on the trail.
8-98-9indicate that the likelihood of getting stuck is considerably higher. Mud holes here may be deep and rock climbing will be more arduous.
1010is reserved for the most demanding off-road trail in the Northern California—the Rubicon Trail.

Note: Trail ratings are highly subjective. A trail that is easy for an experienced driver with a highly modified vehicle may be impassable for a novice driver in a stock vehicle. Weather conditions may also significantly affect the difficulty of a trail. Also, the difficulty of a trail may change over time, as trail use, weather, and maintenance modify the trail. Always check with the managing organization and/or recent users before planning a trip on a trail and scout ahead on foot if you are not sure of current conditions.