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Rating Systems:4x4TrailInfoArizona 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 | Wells |
| Easy | 1-3 | Gravel, dirt, clay, sand, or mildly rocky road. Gentle grades. Water levels low except during periods of heavy runoff. Full-width single lane or wider with adequate room to pass most of the time. Where shelf conditions exist, road is wide and well-maintained with minor sideways tilt. Four-wheel drive recommended on most trails but some are suitable for two-wheel drive under dry conditions. Some clay surfaces may be impassable when wet. |
| Moderate | 4-6 | Rutted dirt or rocky road suitable for most sport utility vehicles. Some obstacles will require careful tire placement. Four-wheel drive, low range, and high clearance required. Standard factory skid plates and tow hooks recommended on many trails. Undercarriage may scrape occasionally. Some grades fairly steep but manageable if dry. Soft sand possible. Sections of sideways tilt will require caution. Narrow shelf roads possible. Backing may be necessary to pass. Water depths passable for stock high clearance vehicles except during periods of heavy runoff. Mud holes may be present especially in the spring. Brush may touch vehicle. |
| Difficult | 7-10 | Some trails suitable for more aggressive stock vehicles but most trails require vehicle modification. Lifts, differential lockers, aggressive articulation, and/or winches recommended in many cases. Skid plates and tow hooks required. Body damage possible. Grades can be steep with severe ground undulation. Sideways tilt can be extreme. Deep water crossings possible. Shelf roads extremely narrow; use caution in full-size vehicle. Read trail description carefully. Passing may be difficult with backing required for long distances. Brush may scratch sides of vehicle. |
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.