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TRAILS (MAINTENANCE ACCESS) Hard Surfaced: Common uses are hiking, biking, alternative transportation commuting, maintenance access, jogging, ski touring, walking and nature observation. No motorized vehicles should be permitted on the trail system except for maintenance purposes. National guidelines for handicapped accessibility should be strictly adhered to in the design of trails width from five to twelve feet, depending upon the use anticipated, and are normally surfaced with gravel, soil or woodchips. Typical preliminary design solutions for trails and signage are shown below. A five-inch thick concrete surface with strength of 4000 psi, eight to ten feet wide, should be placed over a four inch compacted aggregate base course. Asphalt surfacing is not recommended due to flooding and maintenance problems. Concrete is far more economical over the long term. The Denver Greenway trail system along the South Platte River is constructed with a color additive to enhance its appearance in the natural river environment. Other local sponsors are encouraged to continue its use to help create a unified river corridor. The trail, continuous throughout the 40-mile corridor, should be built on a relatively flat bench, 12'-14' wide, at or above the 5- to IO-year flood level wherever reasonable. Street/trail conflicts should be minimized to the fullest extent by constructing underpasses at automobile bridges. The underpasses should have a minimum vertical clearance of 8'6" and be placed at or above the two-year flood surface whenever possible. Trail connect ions to the cross-street above shaul d be provi ded where exist i n9 clearance is insufficient and to offer access and continuous passage during periods of higher flows. short tenn equestrian use " concrete path with 4" aggregate base course Convenient trail connections from tributary streams, consistent with the Colorado Division of Parks and Outdoor Recreation's "Colorado Greenway" loop-trail plan, as well as from local on-street bike routes should also be provi ded. A s i gnage system throughout the corri dor is recommended whi ch locates and describes special features and identifies potentia1 safety hazards for the benefit of recreationists, wildlife observers, bicycle commuters and others using the trail system. k5'-O~~ soil pavement \-unobStructed trail corrldof' w-w......,'" Soft Surfaced: jogging, hiking, Common uses are equestrian, nature ski touring and maintenance access. observat i on, walk i ng, These trails vary in SOFT SURFACE TRAIL SKETCH