springs and water troughs have been maintained and improved by park volunteers. All surface water in the park should be filtered before drinking to remove harmful organisms. The state has replaced the many crude pit toilets with clean well-maintained toilet structures known by the volunteers as "Taj MaPotties". They are wheelchair-friendly, but the trails to them are not. Recreation Most visitors at Coe Park hike or mountain bike on the numerous trails within the park. There are about of dirt roads and trails in the park. Some of the dirt roads are wide and designed well, some are narrow and rutted, and some are so overgrown as to be easily missed. Recently constructed single-track trails are usually maintained, and, in general, the closer one is to Coe Headquarters, the more such trails there are. More remote trails are often just old jeep roads overgrown to a single-track width; others were created solely by repeated use, especially by equestrians. These were often made with insufficient forethought and often suffer moderate to severe erosion problems, or may be overgrown and difficult to follow much of the year. Henry Coe also provides exceptional backpacking opportunities. The park is so large and there are so many roads and trails, that one could plan a route covering ten miles per day, at a different campsite each night, and go two weeks without ever using the same trail or dirt road. Coe is the only park in the San Francisco Bay Area where this is possible. Backpackers also have the opportunity to fish while in the park as several of the lakes support large populations of largemouth bass and bluegill. Mississippi Lake, Coit Lake, and Kelly Lake are popular fishing destinations for backpackers. Permits are required, but are usually easy to obtain, except on busy spring weekends. The park is considered mountain bike friendly from the Hunting Hollow entrance, since there are only a few miles of trails off limits to them (though this includes the whole of Orestimba Wilderness, but this is too far away for most bicyclists to reach on a day ride). It is not unusual for as much as half of park visitors on a given day to be mountain bicyclists, though this is normally closer to 30%. Equestrians also make use of the trails, including the Orestimba Wilderness area, though they account for less than 1% of all visitors. As in