An important first step in managing forest roads is to perform a survey to identify sources of erosion and hydrologic hazards such as undersized culverts. With this information, managers can prioritize maintenance needs and restoration opportunities. Without such information, roads can fail – causing environmental damage and an expensive fix.
• Road erosion and hydrologic hazard surveys
• Geomorphic Road Analysis and Inventory Package (GRAIP)
• Road BMP evaluations
• Culvert surveys including fish passage assessments
• Threatened, Endangered and Sensitive plant species surveys
• Noxious weed assessment
• Project-level Travel Analysis Reports
The Nature Conservancy’s Clearwater-Blackfoot Project (CBP).
We are currently inventorying the roads and culverts on more than 100,000 acres of former Plum Creek timberlands in western Montana as part of The Nature Conservancy’s Clearwater-Blackfoot Project (CBP). A priority of the CBP is to assess the road system and identify opportunities for mitigation and restoration. We are identifying problems with drainage, landslide hazards, and erosion; assessing stream crossings including stream habitat characteristics and culvert measurements; and identifying noxious weeds along roads and stream crossings. All data is entered into a geodatabase where hotspots and BMP needs can be quickly queried and used for implementing projects on the ground.
Geomorphic Roads Analysis and Inventory Package (GRAIP)
A new approach to measuring road erosion and hydrologic hazards has been developed by the US Forest Service called GRAIP. The Geomorphic Roads Analysis and Inventory Package (GRAIP) combines a road inventory with a powerful GIS analysis tool set to predict production and delivery, hydrologic connectivity, landslide and gully risk, and stream crossing failure risk. GRAIPs helps determine the overall infrastructure condition with identified erosion points. The method is rapidly being adopted by forests around the western US. For more information about GRAIP read our recent review on road restoration we co-authored with the Forest Service developers of GRAIP.
An example of GRAIP output. Often, less than 10% of the road system contributes 90% of sediment delivery.