C150347 Feasibility Study - Laserfiche WebLink

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Roads There are State, private, County and Forest Service roads within the burned area. The mainline County Roads and Colorado State Highway (SH) 14 form the transportation backbone in the foothills and mountainous areas affected by the High Park fire. SH 14 serves as a major east - west route for recreational users of the Poudre River and Forest Service Lands. There are numerous private homes and cabins, some clustered in small unincorporated communities such as Poudre Park, located immediately adjacent to the highway and river. SH 14 extends over Cameron Pass and provides year -round access to the North Park area. Potential post-fire impacts include damage to the road system and/or loss of access due to increased runoff rates that overwhelm the capacity of bridges and culverts, plugging of hydraulic structures by debris and sediment, severe erosion of the road surface, or deposition of sediment or debris on road surfaces. Increased risk for temporary loss of access /egress exists on both SH 14 and mainline County Roads in the burn area. There are approximately 42.3 miles of County maintained roads located within the boundaries of the High Park fire burn area. The County maintained road mileage is evenly split between paved (21.3 miles) and non -paved (21.0 miles) road surfaces. Major County roads impacted by the High Park fire and located directly within or adjacent to the burn area include: • CR 25E (Redstone Canyon Road) • CR 27 (Buckhorn Road changing to Stove Prairie Road north of CR 44H) • CR 29C (Missile Silo Road) • CR 44H (Buckhorn Road) • CR 52E (Rist Canyon Road) • CR 63E (Pingree Park Road) There are also many miles of County roadway that run along the southern and western boundaries of the burn area that will likely receive concentrated water, sediment and debris runoff generated from hill slopes and drainages in the adjacent burned areas. These roads include: • CR 23 in Bellvue • CR 25E between CR 50 and CR 52E • CR 27E north of CR 52E • CR 50 CR 54E in the Bellvue area Additionally, there are 98.5 miles of private roads in the fire area, virtually all of which are non - paved. These private roads serve subdivisions such as Whale Rock, Davis Ranch, Stratton Park, Paradise Park and Glacier View as well as a variety of 35+ acre parcels that did not go through any County subdivision approval process. The County roads all functionally serve as collector roads on the County network. CR 27 (Buckhorn Road) functions as a major collector roadway and carries about 1,000 vehicle trips per day. The other county maintained roads in the burn area serve as minor collector roads but also carry significant traffic. For example, east of the Davis Ranch Road access point, CR 52E (Rist Canyon Road) has an average daily traffic load of more than 1,100 vehicles per day. Any damage to, or blocking of, the county road network, or private roads, could eliminate access to residents, emergency service providers or the general public using these routes to reach other areas of the County. County Roads such as CR 27 (Buckhorn /Stove Prairie) have also been used as detour routes for recent post -fire debris flow episodes that have affected and dosed SH 14. Private gravel roads within the burned area are also likely to exacerbate the risk of flooding and erosion by collecting surface water, concentrating it and delivering it to hill slopes or stream channels. Most of the private roads within the burn have inadequate cross - drainage culverts. High Park Fire Emergency Stabilization Plan Page 9