Easiest

Relatively flat and smooth trails that are often wider than three feet. The trail surface is generally hardened, gravel, or paved.

Easy

Trails may have short or gradual hills. Trails may have a natural surface, but the surface is stable and there are relatively few obstacles. 

Moderate

Generally narrow (singletrack) trails. Usually natural surface with some obstacles and mid-sized hills. No steep slopes unless they are short. 

Difficult

Singletrack trails with steep sections, long climbs or descents, exposed roots and rocks and other slipping hazards or obstacles. 

Expert

Narrow trails with significant steep climbs and descents, and many obstacles and slipping hazards. Could include sections that require route-finding or rock-scrambling. 

Easiest

Well-marked trails that have been built specifically to introduce people to motorsports with designated parking, signed access and no obstacles for use. 

Easy

Trails that are wide with an even and graded surface, often that a standard vehicle could drive over with little trouble.

Moderate

Trails may have some rocks, gullies or other obstacles and may be the minimum width necessary for the allowed use. They do not go up or down any extremely steep slopes. 

Difficult

Trails that may be the minimum allowed width for the designated use with some very steep slopes, tight turns or rocky areas. 

Expert

Trails that are the minimum allowed width for the designated use with significant sections of very steep slopes, tight turns or rocky areas that require expert skill in maneuvering the vehicle.

Easiest

Little or no prior paddling experience is necessary; these trails are great for first-time paddlers and are beginner and family-friendly. Hazards are minimal and water is mostly flat with no or very minor obstacles, no skilled maneuvering is required. 

Easy

Hazards are still minimal and water can be flat or slow-moving with very minor obstacles, no skilled maneuvering is required and only short portages (carrying the boat) when on the water. Paddlers may encounter Class I rapids (small ripples and waves).

Moderate

Some prior paddling experience is suggested for a comfortable trip. There may be hazards or obstacles that require more skillful maneuvering, including Class I and II rapids (straightforward rapids with clear, wide channels), downed trees, winding watercourses (stretches of river with quick turns), and some eddies. 

Difficult

Prior experience is required to complete this trip. Hazards or obstacles (downed trees along winding watercourses, very swift water, and strong currents) will require more skillful maneuvering. There may be Class II or III rapids (moderate, irregular waves which may be difficult to maneuver). 

Expert

Advanced paddling experience/skills and a high degree of adventure are required to complete this trip. Hazards or obstacles will require very skilled maneuvering and are dangerous to non-expert paddlers, including stretches with Class III+ or higher rapids (intense, powerful, or extremely long rapids) or remote trips requiring navigation skills or backcountry emergency knowledge.