Boggs Mountain Demonstration State Forest Draft ... - Cal Fire
Boggs Mountain Demonstration State Forest Draft ... - Cal Fire
Boggs Mountain Demonstration State Forest Draft ... - Cal Fire
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<strong>Boggs</strong> <strong>Mountain</strong> <strong>Demonstration</strong> <strong>State</strong> <strong>Forest</strong> <strong>Draft</strong> Management Plan, June 2008<br />
5. Rock surface<br />
ROAD 300<br />
Mileage begins from gate just past Bluff Spring and proceeds south and east to junction of Road<br />
100 at east end of forest.<br />
Site1: Mile 0.0 (gate) to 0.6 (Bluff Sp.) (3168 ft.)<br />
Priority: High<br />
This section of road is insloped with an outside berm and inboard ditch. The inboard ditch has<br />
failed in several locations due to sediment deposition and dense vegetation within the ditch. This<br />
has directed runoff onto the roadway and has led to surface erosion. The road grade in this<br />
section is approx. 3%. At mile 0.6, a natural dip in the road has pooled runoff due to lack of a<br />
drainage structure. A rolling dip should be installed here.<br />
Remedial treatments include:<br />
1. Outslope road surface<br />
2. Excavate outside berm and smooth over roadway<br />
3. Install rolling dips<br />
4. Improve existing drainage structures<br />
5. Rock surface<br />
Site 2: Mile 0.65 (Bluff Spring)<br />
Priority: High<br />
This is an active spring site that flows all year. The main problems occurring at this location is the<br />
plugging of the ditch relief culvert and the undermining of the roadbed. Just up-road from the<br />
culvert, the spring flows under the road creating an unstable sub-grade. The ditch relief culvert<br />
(12” diam.) is undersized and is prone to plugging from sediment and vegetation. At the outfall of<br />
the culvert, significant erosion has taken place to the fill surrounding the outlet. There is little or no<br />
armor here. The inboard ditch associated with this site is plugged with vegetation and commonly<br />
overflows onto the roadway during winter storms.<br />
Remedial treatments include:<br />
1. Clean and improve inboard ditch<br />
2. Upgrade culvert to 18” diam.<br />
3. Armor outfall of culvert<br />
4. Rock road surface<br />
Site 3: Mile 0.65 to 0.9 (1320 ft.)<br />
Priority: High<br />
This section of road is insloped with an outside berm and inboard ditch. Drainage structures<br />
(waterbars) have failed in this section and rills and gullies have formed in the roadway. The<br />
inboard ditch has failed in several locations due to sediment deposition and dense vegetation<br />
within the ditch. This has directed runoff onto the roadway and has led to surface erosion.<br />
Remedial treatments include:<br />
1. Outslope road surface<br />
2. Excavate outside berm and smooth over roadway<br />
3. Install rolling dips<br />
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