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

Black Hills 4 Wheelers
Trail Rating System

This is the system used by the Black Hills 4-Wheelers club.
VERY similar to the Black Hills Jeeps' system.

11-2Passable by stock and 2WD vehicles, improved dirt, gravel etc.
23-4Scenic, touring trail ride; four wheel drive required occasionally, some mud holes or rocks that would stop most other vehicles are traveled easily in 4WD.
35-6For novice and experienced drivers alike; the most fun four wheeling you can expect to have in a stock four wheeler; low range may be required often; vehicle damage is a possibility.
47Not advisable for novice drivers; potentially dangerous situations; maximum ground clearance, lowest gears, and minimum tire size of 33 inches required; lockers, limited slips, winches, and jacks advised due to moderate to large rocks and obstacles, vehicle damage is likely. Full size vehicles limited to specific trails at this rating.
4+8Not advisable for novice drivers; potentially dangerous situations; maximum ground clearance, lowest gears, and minimum tire size of 33 inches and one locker or two limited slips required; jacks and winches indispensable due to large boulders, steep inclines; vehicle damage is very likely. Full size vehicles limited to specific trails at this rating.
59No novice drivers; dangerous situations; maximum ground clearance, lowest gears, minimum tire size of 35 inches and two lockers or limited slips required; jacks and winches indispensable due to large boulders, steep inclines; vehicle damage assured. Full size vehicles limited to specific trails at this rating.
5+10For the hard core experienced driver; extremely dangerous situations; maximum ground clearance, lowest gears, minimum tire size of 35 inches, two lockers, and winch are required. Full size vehicles limited to specific trails at this rating.

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.