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Increased storm runoff due to the fire's effects can cause the failure of undersized culverts and <br />lead to erosion of the road fill, thereby deteriorating water quality. Stream diversion potential may <br />exist along insloped roads with a continuous road grade. <br />Larimer County will upgrade or replace culverts located within high -risk areas, or add features to <br />alleviate sediment deposition on the county road, within the culverts, or downstream. Larger <br />culverts, headwall and endwall treatments, or riprap aprons will be installed to increase the <br />efficiency of flow through the culverts, prevent overtopping, or reduce erosion and sedimentation <br />at the culvert locations. Larimer County has prioritized the reach of Rist Creek/Rist Canyon Road <br />extending from the mouth upstream to Davis Ranch Road for consideration of structure upgrades. <br />There are a number of driveway crossings of Rist Creek that must also be analyzed to determine <br />their effects on flow capacity and risk of overtopping during post -fire flood events. Stream <br />channel crossings along CR 27 (Buckhorn Creek) and CR 25E (Redstone Creek) are also areas <br />of high risk and will be analyzed and potentially upgraded to increase hydraulic capacity and <br />create conditions where the roadways can withstand overtopping flows. <br />On Forest Service lands, a determination was made that BAER treatments are needed on nearly <br />all system and non - system roads within the burned area. The following treatments were identified <br />as BAER road treatments for the High Park Fire burned area: <br />• Temporary road closures are recommended for NFSR 100 and NFSR 152 to protect <br />public safety. <br />• Road stabilization with Rolling Dips, Lead Outs and Ditches <br />• Treatment of hazard Trees and Unstable Rocks to protect workers implementing BAER <br />treatments <br />• Erosion control on steep side slopes above or adjacent to roads by aerial mulching, aerial <br />mulching is addressed above. <br />• Removal of culverts on all roads and replaced with hardened low water crossings <br />• Replacement of culverts when drainage /vegetation has been restored <br />• Storm Inspection and Response on roads to remain open <br />TRAILS AND RECREATION FACILITIES <br />The following recommendations are made for trails and recreation facilities: <br />• Mountain Park Campground: Restrict use of host site and sites 1 -5, 17, 20, 23 until slope <br />stabilizes, by removing them from the reservation website. Inform campers that non -life <br />threatening debris flows may occur around site 32. Have hosts monitor rain events and <br />debris flows. Post signs at campground: In case of flash flood climb to safety. <br />• Culverts at Stove Prairie Campground and Diamond Rock Picnic Area: Remove hazard <br />trees above culvert at Diamond Rock to provide for crew safety, and install large diameter <br />rock riprap in area below outlet of culvert to dissipate water flow energy. Install caution <br />sign at picnic table below culvert. <br />• Trails: Keep all trails closed to ensure public safety until trail stabilization can be <br />implemented or conditions stabilize. Remove hazard trees to ensure crew safety during <br />construction of trail stabilization features. Post "entering burn area/stay on trail" and flood <br />High Park Fire Emergency Stabilization Plan Page 22 <br />