Boggs Mountain Demonstration State Forest Draft ... - Cal Fire

Boggs Mountain Demonstration State Forest Draft Management Plan, June 2008
Appendix II. Road Management Plan
Introduction
This road management plan involves erosion control, watershed restoration and road
rehabilitation work on Boggs Mountain Demonstration State Forest (BMDSF) in Lake County, Ca.
Upgrading of the road network is essential for long term resource management, administrative
access, fire control and recreational purposes. A major goal of this plan is to establish a road
system that is largely self-maintaining and/or requiring low levels of maintenance. Road
upgrading will minimize fine sediment contributions to stream channels and reduce the risk of
serious erosion and sediment yield when large magnitude storms occur. A variety of upgrade
techniques such as culvert upsizing, converting ditched insloped roads to outsloped alignments
and installing rolling dips as well as other treatments will be utilized throughout the road network.
A systematic approach to road management problems was employed in order to identify,
prioritize and cost-effectively treat current and future sediment sources on the forest.
Road Survey
To meet the objectives of the road management plan, an assessment of the road system was
conducted. The assessment process included:
1. Field inventories of potential sediment sources:
• roads and landings
• landslides and cut/fill failures
• gullies and stream channels
2. Development of site-specific treatment prescriptions
3. Prioritization of sites for treatment
The road survey was accomplished by identifying work sites beginning from the west end of all
the roads with the exception of Roads 400 and 600. These were surveyed from the south end
(Jct. Road 500) and proceeding north to the junction of Road 300. Sites (i.e. road sections) were
located by noting the mileage (from west to east) on the road inventory data forms. All roadwork
can be laid out using the standard engineering “station” method. A station is a 100-foot interval,
measured along the centerline of the road. A station lath, or colorful flagging, will be installed on
the cutbank along the road every 100 feet starting at the beginning of the road. An alternative to
this method is to label colorful flagging at the beginning and end of a work site. This method can
be accomplished using the mileage locators from the work site descriptions. It is recommended
that work should proceed from the end of the road and work out (i.e., west to east). There are
approx. 9 miles of inboard ditch on the road system. Of this, approx. 7.5 miles can be eliminated
in the upgrade process.
Techniques for Mechanical Erosion Control
1. Road and Landing Ripping (RIP)
Ripping is employed to thoroughly decompact and disaggregate a road or landing surface in
order to improve infiltration and speed revegetation. On a road, it is employed from the outboard
edge to and including the inboard ditch. Typical equipment used for ripping compacted road and
landing surfaces include D-7 and D-8 size tractors with two or three hydraulically operated ripping
or chisel shanks mounted on the rear. On roads, which are less well-compacted and not heavily
surfaced with rock, graders or smaller tractors with chisel teeth mounted on their scraping blades
can also be used for decompacting.
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