11 - Partial Sidecast Pullback / Forest Road Deactivation Practices in the Pacific Northwest

Forest Road Deactivation Practices
in the Pacific Northwest

11 - Partial Sidecast Pullback	Description, Expectations

Description

Partial pullback is carried out when full sidecast pullback is not necessary for roadfill stability, or when road use is required at some point in the future. Stable portions of the roadway surface are left intact as per access management plans for the road. However, in some cases, partial sidecast pullback may not be sufficient to provide longterm slope stability.

Figure 4: Partial Pullback (Plan View)
diagram: partial pullback (plan view)

Sequence of Placing Retrieved Pullback Materials Into the Cut

Bottom:	road surface materials (rock);
Middle:	fillslope materials consisting of overburden and soil;
Top:	organic debris (slash) and woody debris, scattered randomly or left on the ground surface below the road grade. Always make sure that materials are sealed tightly against the cut-bank and drained from beneath.

Expectations

Place retrieved fill tightly against the cutslope. If the retrieved fill volumes will fill the cut and you cannot maintain access as prescribed, you must endhaul all excess material.
Install cross-ditches before placing retrieved fill to ensure that water does not flow into fill material.
Leave road surfaces intact under the retrieved fill unless otherwise recommended.
Keep pullback material out of water courses unless you will use cross-ditches, trench drains or french drains in these zones. In some cases, wood box culverts can be left in place if the openings will handle peak flows, and they are backed up by a suitably large cross-ditch.
Do not inslope or outslope the intact road surface unless directed to do so in the deactivation prescription.

Figure 5: Partial Sidecast Pullback (Cross-Section)
diagram: partial sidecast pullback (cross-section)