D-Drawing_EARTHEN_BARRIER.pdf

The document is a technical drawing titled "Earthen Barrier-G3-4" related to road drainage improvement for the Umpqua National Forest in Oregon, specifically for USFS Road 1610-500. The drawing provides detailed engineering specifications for an earthen barrier design, including isometric and profile views with precise measurements for slope excavation, ditch construction, and road edge definition. The design includes specific instructions for creating a 14-inch high barrier with 1V:1.5H slopes, and notes for constructing ditch lines and small earth mounds to close road entrances and define road edges.

The drawing is part of a broader road drainage improvement project aimed at minimizing sediment loading into Section Creek and reducing road failure risks during extreme weather events. The project is being conducted by the Oregon Department of Fish and Wildlife (ODFW) in collaboration with the United States Forest Service, with a focus on protecting spawning habitats for Oregon Coastal Coho and Winter Steelhead. The technical specifications demonstrate a detailed approach to environmental conservation and infrastructure maintenance, with specific guidelines for slope types, excavation methods, and road preservation techniques.