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

AZVJC
Trail Rating System

This is the system used by the Arizona Virtual Jeep Club.

0.00Highways: These are paved roads suitable for everyday traffic.
0.50Back Roads: These are paved roads that may have filled or unfilled potholes. Typical paved county roads.
1.01-2Maintained Dirt Roads: These roads are graded or maintained year round. Typical non-paved county roads.
1.53Semi-Maintained Dirt Roads: These roads are occasionally graded or maintained. They may cross sandy washes and sections may be rough (washboards).
2.04Easy 2WD/4WD: Features trails with obstacles that are easy to navigate. In optimum weather conditions, these trails may not require the continual use of four-wheel drive (4WD).
2.55Easy 4WD: Moderately demanding trails on which 4WD will be required. You may encounter a wide variety of challenges (Potholes, minor washouts, medium size rocks, and mud holes) on these trails. Higher ground clearance and Off-Road tires are recommended.
3.06Standard 4WD trail: Demanding trails on which 4WD is required. You will encounter a variety of more difficult challenges (loose rocks, large potholes, steep inclines, and large rocks) on these trails. Possible with stock 4WD vehicle, however, recommend traction device (limited slip) in rear differential, aggressive tread and low air pressure. Higher than stock ground clearance is advisable. Low range gears used often. Moderate experience and driving skill advised. Likely paint damage, possible rocker-panel damage.
3.57Challenging 4WD trail: Challenging trails on which low range 4WD is required. You will encounter a variety of more difficult challenges (loose rocks, large potholes, steep inclines, and large rocks) on these trails. Not recommended with stock 4WD vehicle. Traction device (limited slip) in rear differential, aggressive tread and low air pressure highly recommended. Higher than stock ground clearance is advisable. Moderate experience and driving skill advised. Likely paint damage, possible rocker-panel damage.
4.08Difficult trail: These trails traverse very rugged terrain; low-range 4WD is required. Higher than stock ground clearance is required. Aggressive tread and low air pressure are required. Traction Devices (Lockers or limited-slip) in the differentials (front and rear), lift, and larger tires are highly recommended. These trails require above average Off-Road driving skills. High-Lift jacks and winches would also be helpful. There will likely be paint damage and possible vehicle body and/or mechanical damage.
4.59Extreme trail: These trails cross extremely rugged terrain with very steep inclines, large boulders, and potentially dangerous situations. These trails require modified vehicles, including lift, lockers, and over-sized tires. A High level of Off-Road driving skill is required. There will likely be paint damage, possible vehicle body and/or mechanical damage. There are possibilities of rollovers. Winches are recommended.
5.010Impassable trail: These trails are for the extreme four-wheeler only. These trails require highly modified vehicles, including lift, excellent articulation, lockers front and rear, large tires with aggressive tread, winches, high lift jacks. A High level of Off-Road driving skill is required. Paint damage is virtually guaranteed, body and/or mechanical damage is very likely. Rollovers will be more common on these trails and a winch will be used on at least one obstacle.

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.