Packwood Hydroelectric Packwood Hydroelectric Project Project Summary of Engineering Needs Summary of Engineering Needs for Roads – – Preliminary Results Preliminary Results for Roads
Goals and Objectives Goals and Objectives � Determine maintenance levels (USFS) Determine maintenance levels (USFS) � � Document current condition of roads Document current condition of roads � � Identify maintenance/reconstruction needs Identify maintenance/reconstruction needs � to make roads hydrologically hydrologically stable and in stable and in to make roads compliance with USFS maintenance levels compliance with USFS maintenance levels
USFS Maintenance Levels USFS Maintenance Levels � All roads are classified as Maintenance All roads are classified as Maintenance � Level II Level II � Maintain for use by high clearance vehicles Maintain for use by high clearance vehicles � � Log out and brush as necessary Log out and brush as necessary � � Maintain road prism Maintain road prism � � Maintain drainage/structures Maintain drainage/structures � � Remove/repair slides and slumps as needed Remove/repair slides and slumps as needed � for access with high clearance vehicles or to for access with high clearance vehicles or to control resource damage control resource damage
Road/Trail Condition Inventory Road/Trail Condition Inventory � Road prism (tread, Road prism (tread, cutslope cutslope, , fillslope fillslope) ) � � Culverts (size, length, any problems) Culverts (size, length, any problems) � � Mass Wasting (past, potential Mass Wasting (past, potential – – size, size, � delivery to streams) delivery to streams)
Road Road Tread Gradient % Full Tread Width LF Travel Width Segment Start LF (tread wear) Station Condition Condition � On Grade Segment End Road Configuration � Thru fill Station � Thru cut Drainage Point � Partial bench Station (ft) � Full bench � None Tread � None Delivery � Direct Configuration � Half (Stream, Lake or � Direct via gully Road Issues: � Full Wetland) � 1-100 LF Sidecast berm � � Flat � 101-200 LF � Rutted >4” Road Shape � Insloped � Culvert � Potholes � Outsloped Drainage Point � Arch e d Cul ve rt � Holes/failed drng. structure � Crowned Type � Box Culvert � Debris on road (rock, soil) Driveablility � Overgrown � Ditchout � Water running across road � Blocked � Bridge Saturated road bed � � Not driveable � Natural Swale � Washboarding � 90 – 100 % � Sag Point � Washout Cut Slope Cover � 70 – 90 % � Water Bar Density � 50 – 70 % � Dispersed Fill Slope Structure Issues: � 30 – 50 % Ditch Width � Potential to deliver LF � 10 – 30 % (sum of 2 ditchs) � Oversteepened fill � 0 – 10 % Ditch Veg. or � Yes � Culvert fill failing Cut Slope Average � No cutslope Rocked � No � Soft fill on shoulder Height � 2.5 VF � Shoulder slope failure Ditch Eroding � Yes � Perched landing � 5.0 VF � No � Sidecast cracking � 10.0 VF 2 ditches � Yes � Sidecast erosion � 25.0 VF Ditch Depth � No ditch � < 45º (<1:1) � < 1 LF Cut Slope Angle � 45–50º (1:1) � 1–2 LF � 50-70º (1/2:1) � > 2 LF � > 70º (1/4:1) Ditch Issues: Cut Slope Structure Issues: Stream in ditch � � Stable Cut Bank � Ditch partially blocked Overhanging’ � � Ditch fully blocked � Solid Rock Seepage from bank � � Raveling, large Raveling, fines � � Slumping
Purpose Inlet Outfall Drop Photo Stream crossing OK Yes Number ______ � � � � Relief � Perched intake � No Drop < 1’ � � Other ______ <1’ Culverts Culverts � 1’ to 2 � Perched intake � 2’ to 5’ >1’ � > 5’ Inlet Features Outlet Features Future Plug Potential Type of Culvert � Trash rack � Downspout � None � CMP � Drop inlet � Armored � Low Wingwall Other ______ Medium � HDPE � � � Puncheon Other ______ High � � � Cast iron � � Concrete � Inlet Blockage Outlet Blockage Prescription Urgency Tile � � None � None � None Wood staves � � 0 to 25% � 0 to 25% � Low � Arched Pipe � 24% to 50% � 24% to 50% � Medium � Bottomless Arch � 50% to 75% � 50% to 75% � High � Other ______ � 75% to 100% � 75% to 100% Cause _______ Cause __________ Culvert Condition Issues Culvert Function Issues Prescription � No Problems � None � None � Belly � Cutslope erosion � Clear Ditch � Bent � Ditch Blocked � Rebuild CB � Broken � Failed Headwall � Headwall Install/Repair � Corrosive rust � CB full of Sediment � Backhoe � Corrosive Rust with holes � CB Full of Water � Remove blockage � Fill Failing � CB too Deep/Sump � Flush � Intake damaged � Poor Alignment � Raise � Outfall damaged � Intake Eroded � Lower � Partially Crushed � Flow under/ around � Lengthen � Puncheon Failing � Too short � Cut at outfall � Separated � Too Small � Repair � Undermined � Outfall eroded � Remove � Shotgunned � Add Flume Armor outfall � Replace w./driveable dip �
Mass Wasting Mass Wasting Surveyor Road Number Date Weather Station (ft) Length (ft) Width (ft) Scarp Height (ft) Estimated Past Failure volume (cu ft) Delivery to Stream Estimated Future Failure (%) volume (cu ft) Type Activity Features Future Failure Potential Shallow debris Active Cracks High � � � � slide � Potential � Scarps � Medium � Debris torrent � Inactive � Sagging � Low Deep-seated Holes � � rotational � Wet Vegetation � Other ______ � Leaning Trees � Ponded water Photos: Comments: Potential Treatment Treatment Urgency � Fix drainage � High Dewater slope Medium � � � Pull back fill � Low � Retaining wall/butress Revegetate � � Other________
Snyder Road (1260) Snyder Road (1260) � Paved 18 Paved 18- -20 foot wide tread, generally in 20 foot wide tread, generally in � good shape, 5.14 miles to end of parking good shape, 5.14 miles to end of parking lot at trailhead lot at trailhead � One unstable area (raveling One unstable area (raveling cutslope cutslope/ / � fillslope) just past Mile 4 ) just past Mile 4 fillslope � 53 culverts inventoried; 3 need cleaning; 53 culverts inventoried; 3 need cleaning; � medium priority medium priority � Approx. 3,800 feet of road has direct Approx. 3,800 feet of road has direct � hydrologic connection (14% of length) hydrologic connection (14% of length)
Pipeline Road (1260- -066) 066) Pipeline Road (1260 � Rocky 15 Rocky 15- -20 feet wide tread, generally in 20 feet wide tread, generally in � good shape, 1.34 miles to parking lot good shape, 1.34 miles to parking lot � Some areas of potholes Some areas of potholes � � One unstable area (road sags) at Mile One unstable area (road sags) at Mile � 0.75 0.75 � No direct connectivity to streams No direct connectivity to streams �
Pipeline Trail (#74) Pipeline Trail (#74) � Gravel/rocky 6 Gravel/rocky 6- -10 foot wide tread, rough in 10 foot wide tread, rough in � spots, 2.3 miles from parking lot to lake spots, 2.3 miles from parking lot to lake � 9 mass movement sites; 4 show potential 9 mass movement sites; 4 show potential � for future erosion or sliding for future erosion or sliding � 21 culverts inventoried; 19 need cleaning; 21 culverts inventoried; 19 need cleaning; � 5 high priority, 4 medium priority 5 high priority, 4 medium priority � Approx. 800 feet of trail has direct Approx. 800 feet of trail has direct � hydrologic connection (7% of length) hydrologic connection (7% of length)
Latch Road (1262) Latch Road (1262) � Gravel 10 Gravel 10- -20 foot wide tread, generally in 20 foot wide tread, generally in � OK shape, 4.54 miles to parking lot OK shape, 4.54 miles to parking lot � Some ruts/potholes Some ruts/potholes � � No unstable areas No unstable areas � � 26 culverts inventoried; 15 need cleaning; 26 culverts inventoried; 15 need cleaning; � 3 medium priority 3 medium priority � Approx. 3,500 feet of road has direct Approx. 3,500 feet of road has direct � hydrologic connection (14% of length) hydrologic connection (14% of length)
Nov 7 Nov 7 � Pipeline Trail (#74), � Pipeline Trail (#74), 0.85 mile from 0.85 mile from Slide Slide parking lot parking lot � Un � Un- -named stream named stream (east of Art Lake (east of Art Lake Creek) Creek) � Slide related to � Slide related to heavy rains (16” ” in in heavy rains (16 6 days) 6 days) � 180 foot long � 180 foot long headscarp headscarp � Started to clear � Started to clear debris on Latch debris on Latch Road (downslope downslope) ) Road (
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