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<br />Land-Based Prescriptions <br /> <br />Specific guidance for each area is described <br />using the following six categories: visitor <br />experience, access, natural resource <br />management, cultural resource management, <br />facilities, and maintenance. <br /> <br />Primitive <br /> <br />Management provides wilderness <br />experiences. Challenge and adventure for <br />visitors are high and are in an environment <br />free of human influence and alteration. <br />Natural processes and conditions would be <br />perpetuated. The setting is composed of an <br />unaltered natural landscape. Encounters <br />with other people are infrequent, and there <br />are no facilities present unless essential to <br />protect resources or provide for visitor <br />safety and well-being. There is no motorized <br />access. <br /> <br />Visitor Experience. The primitive area <br />provides abundant opportunities to <br />experience the backcountry wilderness in <br />solitude. It is reserved for hiking, fishing, <br />nature observation, climbing, kayaking, and <br />primitive camping. Off-site interpretation and <br />education are stressed. <br /> <br />Generally visitors are isolated from human <br />sights and sounds. Visitors can experience a <br />feeling of closeness with nature and there is <br />the opportunity to experience solitude, <br />tranquillity, and quiet because encounters <br />with others are few. A high degree of <br />challenge, self-reliance, and risk is prevalent <br />for visitors to this area, and knowledge and <br />use of outdoor survival and wilderness skills <br />are highly recommended. <br /> <br />Evidence of recreational use is generally not <br />readily apparent except along trails, access <br />routes, and backcountry campsites. Resource <br />manipulation is kept to a minimum, but some <br />resource management actions may be <br />required to reduce the impacts of visitor use. <br /> <br />52 <br /> <br />A limited number of interpretive exhibits or <br />signs may be needed to meet objectives of <br />protecting the resource. Rules and <br />regulations are explained to visitors before <br />they enter the wilderness. <br /> <br />I <br />I <br />I <br />I <br /> <br />Management helps to ensure an experience <br />in an untrammeled, primeval environment. <br />Evidence of other visitors is also small, and <br />there is a sense of being immersed in a <br />natural landscape, without comforts and <br />conveniences. Visitors commit to a high level <br />of time and energy. <br /> <br />I <br />I <br />I <br />I <br />I <br /> <br />Access. Access is difficult. The area within <br />designated wilderness is roadless, and <br />visitors may travel cross country or on low- <br />standard trails that provide connections over <br />ridge lines, to the canyon rim and to the <br />river. Discovery and adventure are the order <br />of the day. <br /> <br />Public access is by foot, except for trails also <br />designated for horseback use. Within the <br />wilderness, aircraft use is only permitted for <br />emergencies and necessary administrative <br />functions. Aircraft and vehicle use within the <br />primitive prescription area but outside of <br />wilderness is limited to emergencies and <br />administrative functions. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Natural Resource Management. The natural <br />environment is preserved to the maximum <br />extent possible while accommodating low- <br />density backcountry use. Naturally <br />occurring species are maintained or <br />reestablished, and populations of sensitive <br />species are protected and augmented. The <br />introduction of nonnative species is <br />prevented to the extent possible, and <br />attempts are made to eliminate introduced <br />species before they became established. The <br />NPS maintains close control over resource- <br />damaging activities. <br /> <br />Monitoring is carried out regularly, and <br />mitigating measures (revegetation, species <br /> <br />I <br />I <br />I <br />