village was abandoned in the early 20th century and the inhabitants moved to Darwin, California. Saline Valley was a significant mineral source in the late 19th and early 20th centuries. The Conn and Trudo Borax Company mined borax from the salt marsh from 1874 to 1895. The remains of this site can be seen today as a few shallow pits near Saline Valley Road. Salt mining began in 1903 at the south end of the lake, and continued into the 1930s. An electric aerial tram was constructed in 1911 to carry the salt 14 miles (22 km) over the Inyo Mountains to a terminus northeast of Keeler, California in the Owens Valley. It operated sporadically from 1913 to 1936, but ultimately proved to be too expensive to run. The tram, which was placed on the National Register of Historic Places in 1973, was the steepest ever constructed in the United States. It rose from an elevation of 1100 feet (340 m) in Saline Valley to 8500 feet (2600 m) over the mountains, and then down to 3600 feet (1100 m). Route was south from Salt Lake to Daisy Canyon then southwest and terminated at the Southern Pacific RR between Dolomite and Swansea. In recent years it has been badly damaged by vandals. As early as the 1960s, the hot springs in the valley became popular among nudists, and were eventually improved by volunteer labor, to include concrete tubs, a shower, a sink, and three outhouses (which the Park Service later replaced with concrete-lined latrines). For improved access, two airstrips were built, the "Chicken Strip" and "Tail-Dragger Strip" (the latter is now closed). The Saline Valley Warm Springs, as they are called, have become controversial in recent years. The improvements would have violated Park Service policy if they had taken place today. There has been compromise so far; a park host is always on duty, visitors are limited to 30 days per year, and the springs do not appear on any official NPS map. The campgrounds retain a clothing-optional policy which the park has taken no official stance on. As stated in the 2019 Saline Valley Warm Springs Management Plan and Environmental Impact Statement, "Public nudity is common at the site, and the plan is silent on this topic. Public nudity is not against Federal regulations, but lewd behavior is." There are 3 sections of springs, the upper, middle and lower