There are also four hiker dormitories (two for men and two for women), which were built in the 1970s, replacing the four 1925 tent cabins. Each dormitory has 10 beds set up in bunks, a sink, a toilet, and a shower; bedding, towels, and soap are provided. Total capacity for the Ranch is about 90 guests per night. The dining hall, now called Phantom Ranch Canteen, serves breakfast and dinner on a strict schedule and requires advance reservations; the Canteen is open to the public during non-meal hours, offering a small variety of items including snacks, beverages, stamps, T-shirts, postcards, headlamps, and first-aid supplies. Additional facilities include the mule corral, a small amphitheater, employee housing, a ranger station (with limited emergency medical services), and a heliport. Cottonwood trees, a few of which date back to the time of Rust's tent camp, line the creek and shade the buildings. Campers from Bright Angel Campground are not allowed to use the Shower House, but may reserve meals at the Canteen. The only modes of access to and from Phantom Ranch are trails (used by both hikers and mules) and the Colorado River. The North Kaibab Trail leads 13.6 miles to the North Rim. Two trails lead to the South Rim. One is the 9.3 mile route that crosses the Silver Bridge, follows the River Trail for two miles, and then climbs the Bright Angel Trail to Grand Canyon Village. The other is the steeper 7.1 mile route across the Black Bridge and up the South Kaibab Trail. The two bridges, about 700 meters apart, are the only Colorado River crossings within a several-hundred-mile span. Phantom Ranch has no official mail service (unlike Supai, Arizona), but concessionaires have traditionally transported letters and postcards by mule. Packages are excluded from this service. Phantom Ranch's elevation is ; that is about lower than the South Rim and about lower than the North Rim. The average daily high and low temperatures are / during July and / in January. This represents a wide differential from temperatures at the top of the Grand Canyon; at the South Rim, the average daily high and low temperatures are / in July and / in January. The South Rim averages of snow, and Phantom Ranch less than . The riparian zone at the ranch is subject to invasion by non-native species such as tamarix, and volunteers are at times invited to help maintain the original biome by removing them.