Design Parameters.pdf
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- Attached to
- RECOVERY: Construct 25 miles of non-motorized trails in Chattooga and Walker counties, GA
- Solicitation number
- AG-4419-S-10-0604
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Design Parameters
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Other files
| File | Type | Posted |
|---|---|---|
| SOW.docx | DOCX document | |
| Clauses.docx | DOCX document | |
| Wage Chattooga.pdf | ||
| Permit Info.docx | DOCX document | |
| Project Map.pdf | ||
| Wage -Walker Co.pdf | ||
| SF 1442.pdf |
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Design Parameters
Design Parameters are technical guidelines for the survey, design, construction, maintenance, and assessment of National Forest System trails, based on their Designed Use and Trail Class and consistent with their management intent
. Local deviations from any Design Parameter may be established based on trail-specific conditions, topography, or other factors, provided that the deviations are consistent with the general intent of the applicable Trail Class.
Designed Use
PACK AND SADDLE Trail Class 1 Trail Class 2 Trail Class 3 Trail Class 4 Trail Class 5
Design Tread Width
Wilderness (Single Lane)
Typically not designed or actively managed for equestrians, although use may be accepted
12” – 18”
May be up to 48” along steep side slopes
48” – 60” or greater along precipices
18” – 24”
May be up to 48” along steep side slopes
48” – 60” or greater along precipices
24”
May be up to 48” along steep side slopes
48” – 60” or greater along precipices
Typically not designed or actively managed for equestrians, although use may be accepted
Non-Wilderness (Single Lane)
12” – 24”
May be up to 48” along steep side slopes
48” – 60” or greater along precipices
18” – 48”
48” – 60” or greater along precipices
24” – 96”
48” – 60” or greater along precipices
Non-Wilderness (Double Lane)
60” 60” – 84” 84” – 120”
Structures (Minimum Width)
Other than -bridges: 36”
Bridges without handrails: 60”
Bridges with handrails:
84” clear width
Other than bridges: 36”
Bridges without handrails:
60”
Bridges with handrails:
84” clear width
Other than bridges: 36”
Bridges without handrails:
60”
Bridges with handrails: 84” clear width
Design Surface2
Type Native, limited grading
May be frequently rough
Native with some onsite borrow or imported material where needed for stabilization, occasional grading
Intermittently rough
Native, with improved sections of borrow or imported material, routine grading
Minor roughness
Protrusions ≤ 6”
May be common and continuous
≤ 3”
May be common, not continuous
≤ 3”
Uncommon, not continuous
Obstacles (Maximum Height)
12”
6” 3”
10/16/2008
Designed Use
PACK AND SADDLE Trail Class 1 Trail Class 2 Trail Class 3 Trail Class 4 Trail Class 5
Design Grade 2
Target Grade 5% – 20%
3% – 12% 2% – 10%
Short Pitch Maximum
30% 20% 15%
Maximum Pitch Density 15% – 20% of trail
5% – 15% of trail 5% – 10% of trail
Design Cross Slope
Target Cross Slope 5% – 10%
3% – 5% 0% – 5%
Maximum Cross Slope 10%
8% 5%
Design Clearing
Height 8’ – 10’
10’
10’ – 12’
Width 72”
Some light vegetation may encroach into clearing area
72” – 96”
96”
Shoulder Clearance 6” – 12”
Pack clearance: 36” x 36”
12” – 18”
Pack clearance: 36” x 36”
12” – 18”
Pack clearance: 36” x 36”
Design Turn
Radius 4’ – 5’
5’ – 8’ 6’ – 10’
For definitions of Design Parameter attributes (e.g., Design Tread Width and Short Pitch Maximum) see FSH 2309.18, section 05.
The determination of trail-specific design grades, design surface, and other Design Parameters should be based upon soils, hydrological conditions, use levels, erosion potential, and other factors contributing to surface stability and overall sustainability of the trail.
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