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{lu030z. although they were designed for and serve multiple use resource purposes. There are also 1,466 miles of trails on the Forest. The Forest road and trail systems are expected to have maintenance problems in the future because of lack of funding and increased demands for use. Other facilities on the Forest include 16 single family dwellings, 13 crew quarters, and 49 other structures including seven administrative sites, nine work centers, and a tree nursery. There are 143 bridges, 61 of which are for trails - 25 percent of which have been identified as inadequate. There are 57 dams on the Forest of which 40 are under special use. Ten of the dams are classified as high hazard, 20 as moderate hazard, and the remaining 27 as low hazard. Protec t ion The Forest has had wildf ire occurrence at infrequent, irregular intervals. From 1975 to 1981 the Forest averaged 68 fires annually, burning 3,155 acres. However, this ranges from 1976, when the average fire size was one-third acre to the Emerald Fire in 1980, which burned 10,000 acres. Heavy people use and significant fuel problems resulting from a low level of vegetation management in the past indicate a high potential for fire in the future. Mountain pine beetle is a serious pest on the Forest because of the overmature na ture of the Forest's lodgepole pine stands. There have been infestation on the Dillon District since the 1960's, and additional concentrations of infestat10ns have been identified on the Holy Cross, Eagle, and Sopris Dis- tricts. To deal with the problem, a 1.4 millon dollar program was begun in 1982. Air quality over the Forest is good. The main source of pollutants from Forest activities is smoke from wildfire and prescribed burning. The Forest also has three Class I Air Quality Areas: The Flat Tops, Maroon Bells-Snow- mass, and Eagles Nest Wildernesses. There is concern airborne pollutants from energy development could affect the Flat Tops Wilderness. Since recreation use is the dominant activity on the Forest, it creates substantial law enforcement problems. This is expected to continue into the future. WILD AND SCENIC RIVERS The White River National Forest has three river segments identified in the inventory of potential Wild and Scenic Rivers. They are: 1. The Crystal River (including North and South Forks) from the Forest boulldary to the source of the fo rks . 2. The North Fork of the White River, from the White River to the source. 3. The South Fork of the White River, from the White River to the source. 23