Attachment 3 11_FSH2309.18_Design Parameters.doc

23.12 - Exhibit 01

PACK AND SADDLE 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 intent1. 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

(Single Lane)

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 allowed

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)

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

Native, with limited grading May be frequently rough Native, with some on-site borrow or imported material where needed for stabilization and occasional grading Intermittently rough Native, with improved sections of borrow or imported material and routine grading Minor roughness

WO AMENDMENT 2309.18-2008-4

EFFECTIVE DATE: 10/16/2008

DURATION: This amendment is effective until superseded or removed.

2309.18_20

FSH 2309.18 – trails management handbook Chapter 20 – trail development

23.12 – Exhibit 01--Continued

Designed Use

PACK AND SADDLE

Design Surface (continued) Protrusions

≤ 6” May be common and continuous ≤ 3” May be common, not continuous ≤ 3” Uncommon, not continuous

Obstacles (Maximum Height)

12”

5% – 20%

Short Pitch Maximum

Maximum Pitch Density

15% – 20% of trail

5% – 10%

Maximum Cross Slope

10%

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”

4’ – 5’

1 For definitions of Design Parameter attributes (e.g., Design Tread Width and Short Pitch Maximum), see FSH 2309.18, section 05.

2 The determination of the trail-specific Design Grade, 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.