Bridge Inventory and Structure Identification
Information on bridge inventory, inspection forms, and how structures are identified using unique numbers and visual identifiers. Details on the location of bridges, watercourse designations, legal land locations, and road authorities responsible for maintenance."
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Presentation Transcript
Long-Term Patterns of Sediment Production Following Road Construction and Logging in the Oregon Coast Range Austin Wegner
Overview Introduction Alsea Watershed Area Description of the Study Results Discussion and Findings
Introduction Road construction, timber yarding, and slash disposal all contribute to sediment increases, often through mass wasting events Road construction increases slope failure rates by 25-340 times Some practices are less harmful than others https://www.youtube.com/watch?v=ixEeWZN WlhA
Alsea Watershed Study Fall 1958-1973 3 Watersheds were involved Needle Branch Watershed (75 ha) Deer Creek (304 ha) Flynn Creek (202 ha)--Experimental Control Treatments Needle Branch Watershed 82% clear cut Deer Creek Watershed 25% clear cut Flynn Creek left untreated
Results Average Annual Sediment Yields vs Sediment Yields by Month Long term averages can be deceiving
Suspended Sediment by Year Needle Branch (82% clear cut) Deer Creek (25% clear cut)
Discussion and Conclusions Both timing and magnitude of sediment loss are affected by forest harvesting operations Mass wasting events in both experimental watersheds attributed to road building These events did not occur until 7 years after the actual watershed treatments
