Pacific West Region director Chris Lehnertz determined that upgrading the high camp would have no impact on the park, giving the green light to replace camp's non-historic structures.
Mount Rainier National Park superintendent Randy King told the Tacoma News Tribune the project will cost about $700,000 and take three to five years to complete.
Among the improvements are replacing a shelter and toilets.
Camp Muir is the highest backcountry camp, located at an elevation of 10,080 feet. About 500 climbers visit Cam Muir a day during summer and it's one of the main routes for people summiting the mountain.
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