Toilets are overflowing or at capacity in the area due to the government shutdown.
The shutdown has also left a stinking mess at Yosemite National Park in the Sierra Nevada mountain range in eastern California.
Joshua Tree National Park was forced to shut on Wednesday due to health and safety concerns from their "overflowing toilets", while parts of Yosemite National Park are closed to the public due to "human waste issues and lack of staffing".
Kristen Brengel, vice president of government affairs for the National Parks Conservation Association, told CNN that the absence of supervision seems to have created a sense of "lawlessness" among the parks' visitors.
As the government shutdown stretches deeper into the new year, national parks across the country are seeing the impact.
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Pinnacles National Park, also in California, closed its eastern gate because of trash and heavy traffic, reported The Salinas Californian. According to Purdy, she and others have been collecting garbage and cleaning the bathrooms out of the simple goodness of their hearts and love for the nation's parks.
In Utah, only one park remains open. It also doesn't help that the trouble has arrived just in time for peak tourist season when many families are heading out to the national parks on holiday.
"We're deeply concerned about the threat to park resources and to visitor safety with this park closure situation", Garder said in a phone interview Monday.
In most of the parks, services and facilities have been ceased, including their trash collection and restroom services.
"There is more trash and human waste and disregard for the rules than I've seen in my four years living here", Snider said. "A nightmare scenario", he says.
Joshua Tree is expected to begin closing some campgrounds for all but day use.
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Visitors are streaming into the parks to take advantage of the free admission (after all, the visitors' centers are closed and there's no one around to collect entrance fees) and trashing the place once they're in there.
Visitors planning to visit the Yosemite Ski and Snowboard Area will be asked to enter the park via Highway 140.
Rattlesnake Canyon will close to reduce the number of potential search-and-rescue events for rangers already spread thin because of the shutdown, the park service said.
They had unleashed their dogs and let then run freely in an area rich with bears and other wildlife, and were scattering bags of garbage along the roads, Mr Snider said.
This photo shows a road lined with trash in yosemite National Park. But still, they can't keep going forever.
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