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

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Boggs Mountain Demonstration State Forest Draft Management Plan, June 2008 Site 4: Mile 1.2 to 1.4 (Jct. Rd. 300) (1056 ft.) This section of road is insloped with an outside berm with no inboard ditch. Existing waterbars are responsible for all road surface drainage. Gully erosion at junction of Road 300 and considerable amounts of exposed bedrock throughout. Remedial treatments include: 1. Outslope road 2. Install rolling dips 3. Excavate outside berm and smooth over roadway as much as possible 4. Armor outfalls 5. Rock surface ROAD 610 Mileage begins at junction of Road 600 and proceeds east to junction of Road 540. Site 1: Mile 0.0 to 0.55 (2904 ft.) Priority: Low This section of road is insloped with an outside berm and no inboard ditch. Drainage structures (waterbars) have partially failed in this section and rills and gullies have formed in the roadway. There has been significant erosion to the roadway in this section of road evidenced by exposed bedrock and tree roots. Remedial treatments include: 1. Outslope road 2. Install rolling dips and/or waterbars 3. Excavate outside berm and smooth over roadway as much as possible 4. Armor outfalls 5. Rock surface Site 2: Mile 0.55 to 0.75(Jct. Rd. 540) (1056 ft.) Roadway was constructed on a flat hill-slope and cannot be outsloped. Drainage structures (waterbars) are inadequate and runoff is allowed to pool on the roadbed. Major mud boggs at end. Remedial treatments include: 1. Crown or slope road surface 2. Install rolling dips or improve existing waterbars 3. Excavate outside berm and smooth over roadway as much as possible 4. Rock surface 5. Fill “Mud Bog” areas with 6-inch minus compacted shale rock. 78
Boggs Mountain Demonstration State Forest Draft Management Plan, June 2008 BMDSF Road Inventory Project Culvert Inventory and Status Road Mileage Culvert # Diameter (inches) Status Notes 100 .05 1 18 OK .1 2 12 FIX culvert ok, heavy erosion to inboard ditch ? 3 12 FIX excess runoff has created gully from outfall .4 4 24 FIX check culvert size, 1000' inside ditch .5 5 18 FIX vegetation at inlet may cause plugging, erosion downhill from culvert ? 6 18 FIX plugged at outlet .75 7 30/30 FIX Mill Cr., check CMP size, overflow onto road, left culvert slightly plugged, clear veg at inlet .85 8 12 FIX outlet plugged (100%), inlet 65% .9 9 12 FIX outlet needs rock armor, plugged 20% 1.0 10 36(12?) OK maintain vegetation control at inlet and outlet, outlet needs rock armor 1.45 11 12 FIX not plugged, headwall built ? 12 12 FIX culvert is plugged 1.65 13 48 OK Spikenard Cr. headwall 8' 14 12 FIX not plugged, inlet damaged (bent rim) 15 12 OK clean inlet area-OK 16 12 OK clean inlet area-OK, overflow washes over road, gully downhill 17 12 FIX culvert is plugged 50% in +out 2.5 18 12 FIX partially plugged (50% inlet) (75% outlet) 2.55 19 18 FIX partially plugged (10%), erosion at outlet, major gullies 2.65 20 36 OK Malo Cr., boulders at inlet may obstruct CMP 21 24 FIX culvert is rusted through, erosion at outlet, Big Spring 79
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Boggs Mountain Demonstration State Forest Draft ... - Cal Fire

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