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

CA Parks
Trail Rating System

This is the system used by California State Parks for their State Vehicle Recreation Areas (SVRAs).

Easiest1-3Relatively flat, these trails or fire roads provide a good starting point for beginners.
More Difficult4-7Steeper and narrower, these trails usually have plenty of room to turn around at the top or bottom or have an outlet so that riders can avoid returning on the same route.
Most Difficult8-10Steep and narrow, these trails often do not have an outlet; therefore, riders must be able to negotiate the trail in both directions. Only the most experienced riders should travel these routes.

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.