The most current information I have (2007) shows 164.800 being used simplex, but this listing was in the Great Basin Aviation Communications Plan. Aircraft very often talk simplex only on small units such as Great Basin National Park. I do have an official listing from 1997 that shows 164.800 as output and 163.150 as input. The repeater site shown is Notch Peak with a PL of 127.3. Notch Peak is located north of U.S. 6 about 40 miles northeast of the park in Utah.
Its been 17 years since I stopped there and it was a quick overnight in mid October. We arrived in the late afternoon and left early the next morning on our way to Idaho and Montana on a planned two week camping trip. We ended up "camping" in motels more than in campgrounds as the weather was very cold and rainy. We didn't pick up anything on 164.800. About 8 years prior to that, before I had widespread frequency information for natural resource agencies, I stayed there for two nights, when the National Park Service only managed the much smaller Lehman National Monument, and the surrounding land was part of the Humboldt National Forest. This was earlier, just before Labor Day weekend. Being it was so small the National Monument frequency proved elusive when I tried limit searches.
The Park was designated by the Congress in 1986, incorporating over 77,000 acres of the Humboldt National Forest and the small Lehman Caves National Monument. There should be more radio traffic as a result, but it still isn't a heavily used park, with just over 82,000 visitors in 2007. The highest peak in the park, Mt. Wheeler, at 13,063 feet the highest peak in the Snake Range and second highest point in Nevada, has a small glacier on its north side, the only one in the state. There are some backpack trips I would like to take in Great Basin NP as well as over in the Ruby Mtns. Both ranges have glaciated terrain, lakes, very dark night skies, and wonderful remoteness.