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Criterion h;n Ser ii: Czld and Golden Eagle I,es a Analysis: There are no bald eagle nests. 7here.is one known - golden eagle nest in T. 135., R. 90W., Sec. 31, Nldl/4 Ilbl1/4, 6th P.M. This nest is on private lands; however, activities on federal lands may have a negative effect on the eagle nest. At this time the status of this nest is unknown. The nest location was discovered in 1976 by consultants working for ARCO. There has not been any follow-up since that time to determine if the nest has been active. Pending final approval from the U.S. Fish and 4ildlife Service, a - 1/4-mile buffer zone around this nest will be considered unsuitable. This buffer zone will also apply to any eagle nests discovered in the future. Exception: The buffer zone could be considered suitable for underground mining with the following stipulations. Surface facilities, occupancy, surface disturbance, industrial fires, and subsidence will not be permitted in the eagle nest buffer zone. Some surface activities may be permissible in the buffer zone at times other than the breeding/rearing season (March 1 to July 1) or if the nest is inactive. This will require further study on a site-specific basis. Any future activity in, or adjacent to, these buffer zones must be approved by the U.S. Fish and Wildlife Service and Bureau of Land Management. Criterion Number 12: Bald and Golden Eagle Roost Concentration Areas Analysis: There are no known roost or concentration areas in the lease area. Criterion Number 13 Analysis: There falcons have been falcons could occ Criterion Number 14: Falcon Cliff Nesting Sites are no known nesting sites, although prairie documented on the lease area and peregrine ur on the site. Migratory Birds Analysis: The Cooper's Hawk occurs and nests on the lease tract. A nest has been located on the lease tract. The nest is located within the area proposed for surface facilities (T. 135., R. 90W., Sec. 16, SW1/4 SE1/4 NWl/4, 6th P.M.). Activities in the drainage, where the nest is located, from approximately the 6760 foot level up to the ridge top and 1/8th mile on either side of the drainage bottom (see map) are unsuitable. Nearly half of the species of high federal interest depend upon riparian habitat for at least a portion of their life cycle. All riparian zones plus a 1/8-mile buffer strip on each side of the perennial and ephemeral streams should be classed as unsuitable.