HomeMy WebLinkAboutAddenda - RFP - P982 BOBCAT RIDGE TRAIL DESIGN AND CONSTRUCTON (18) 2309.18,2.32a, Ex. 01
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FSH 2309.18 - TRAILS MANAGEMENT HANDBOOK
WO AMENDMENT 2309.18-91-2
EFFECTIVE 11/8/91
2.32a - Exhibit 01
Motorized Bike Trail Guide
Easiest More Difficult Most Difficult 1/
Grade
Max. Pitch 15% 30% 50%
Clearing
Width
Wooded
Downhill Side 2' 1-1/2' 1-1/2'
Uphill Side 3' 3' 3'
Level 1-1/2' each side 1-1/2' each side 1-1/2' each side
Open
Downhill Side 2' 1-1/2' 1-1/2'
Uphill Side 3' 3' 2-1/2'
Level 2' 2' each side 1-1/2' each side
Height 8' 8' 8'
Tread
Width
Minimum 18" 2/ 18" 12"
Maximum 30" 24" 24"
Surface Relatively smooth Sections of relatively Relatively rough with
throughout, no roots rough surface--some very rough short
or rocks protruding loose material such as sections. Long
more than 3'. Avoid sand stretches of loose rock,
sand and loose sand, and mud
materials. desirable where
available.
Obstacles None 1 to 5 small logs (up to 1 to 5 logs (up to 16" in
(optional) 6" in diameter) per mile diameter) per mile
on trail on flat terrain. lying flat on flat
terrain. Small rock
ledges (up to 16")
desirable on occasion.
2.32a - Exhibit 01 -- continued
Turns per 1/4 miles 2' 6 11
1/ Upper limit of grade and pitch length for most difficult trails depends on soil type, amount of rock, vegetation type, and other conditions affecting stability of the trail surface.
2/ Increase tread width 6 inches on switchbacks or where side slopes exceed 50 percent.