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

C.O.R.E.
Trail Rating System

This is the system used by the Craving Off Road Excitement club.

CIRCLE1-3Easy Trail - These trails include fire roads and scenic trails appropriate for the whole family.  Stock rigs will have little to no difficulties. Trail characteristics to include; graded dirt, washouts, shallow water crossing, passable mud, gentle grades, small ruts and rocks.  Areas
are suitable for day picnicking, trail maintenance and area cleanups. Recommended safety equipment should include water, CB Radio, Full-size spare, basic tools,first aid kit and personal items (food, appropriate clothing, etc).
SQUARE4-6Moderate Trail - These trails include fire roads, scenic trails but also add a bit more difficulty.  These roads will begin to require 4-Wheel drive capabilities, along with needing more advanced driving skills.  Trail characteristics include; moderate grades, deeper water and mud, rock sizes may exceed hub heights, sharper uphill and side hill angles, and body damage is possible.  Caution is recommended for wider vehicles. Recommended safety and vehicle equipment;  Easy Trail recommendations, front and rear recovery points, recovery strap and/or winch, spare parts, survival gear, fire extinguisher, locker in one axel, and extra fuel.
DIAMOND7-10Difficult Trail - These trails include severe rock and ruts, shelves, mud bog conditions, water crossings with strong currents, and steep grades and side hills over 30 degrees. Experienced 4-Wheel driving skills are essential.  Winching and trail building are necessary. These trails will be impassible for stock rigs.  Expect body damage and/or mechanical breakdown.  Rollovers are possible. Recommended vehicle equipment should include all above recommendations for Easy and Moderate Trails.  In addition, oversized tires, lift, 2 lockers, and hard top/roll cage are a must.  Extensive spare parts and tools required.  Use extreme caution on these trails.

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.