C4e_ Attachment E Specifications.pdf
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- Attached to
- Mark Twain NF Trail Maintenance
- Solicitation number
- 12444626Q0048
- Issued by
-
Department of Agriculture Forest Service
About this file
This document is a technical specification for Trail Design Parameters for All-Terrain Vehicle (ATV) trails on National Forest System lands, issued under Forest Service Handbook (FSH) 2309.18, Section 23.22.
The document establishes design guidelines across five trail classes, with Classes 1 and 5 typically not designed or actively managed for ATVs, while Classes 2, 3, and 4 represent progressively more developed ATV trail standards. Design Tread Width specifications range from 48"-60" for single-lane Class 2 trails to 96"-120" for double-lane Class 3 trails. Design Surface requirements escalate from native soil with limited grading in Class 2 to native soil with imported stabilization materials and routine grading in Class 4. Protrusion limits decrease from ≤6" in Class 2 to ≤3" in Classes 3 and 4, while obstacle heights range from 12" maximum in Class 2 to 3" maximum in Class 4. Design Grade specifications vary by class, with target grades of 5%-15% for Class 2, 3%-10% for Class 3, and short pitch maximums ranging from 35% to 15% respectively. Additional parameters address Design Cross Slope (5%-10% for Class 2 to 3%-5% for Class 4), Design Clearing height (6'-7' to 8'-10'), shoulder clearance (0"-6" to 12"-18"), and Design Turn radius (6'-8' to 8'-12'). The document notes that local deviations from these parameters may be established based on trail-specific conditions, topography, and other factors consistent with the applicable Trail Class management intent.
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Text version
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Trail Design Parameters All-Terrain Vehicle (FSH 2309.18, Section 23.22, Exhibit 01)
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