C150094 Addendum to Biological Assesment for Long Hollow

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Addendum to Biological Assessment for the Proposed Long Hollow Reservoir the Service's request pertaining to potential impacts to flow recommendations of the SJBRIP. The revised sections in their entirety follow. 11.3.1 Colorado Pikeminnow (Ptychocheilus lucius) Listing, Distribution and Abundance The Colorado pikeminnow currently is listed as "endangered" under the ESA of 1973, as amended (ESA; 16 U.S.C. 1531 et. seq.). It was first included in the List of Endangered Species, issued by the Office of Endangered Species on March 11, 1967 (32 FR 4001), and was considered endangered under provisions of the Endangered Species Conservation Act of 1969 (16 U.S.C. 668aa). The Colorado squawfish (pikeminnow) was included in the United States List of Endangered Native Fish and Wildlife, issued on June 4, 1973 (38 FR No. 106; i.e., the "red book"), and it received protection as endangered under Section 4(c)(3) of the original ESA of 1973. The latest revised Colorado Squawfish (pikeminnow) Recovery Plan was approved on August 6, 1991 (Tyus and Haines, 1991), and critical habitat was designated on March 21, 1994 (59 FR 13374). A total of 1,148 miles (1,848 km) of critical habitat have been designated for the Colorado pikeminnow in the Upper Colorado River Basin. Critical habitat in San Juan River has been designated from near Farmington,New Mexico downstream to Neskahai Canyon in the San Juan arm of Lake Powell (see Figure 16). The Colorado pikeminnow is a cyprinid fish species (minnow) endemic to the Colorado River Basin. The species was once distributed throughout the major rivers and tributaries of the basin in Wyoming, Colorado, Utah, New Mexico, Arizona,Nevada, and California(Jordan 1891; Tyus 1991). This species is the largest cyprinid native to North America. The common name for the Colorado squawfish was changed to Colorado pikeminnow by the American Fisheries Society in 1998. Wild populations or individuals of Colorado pikeminnow are presently found in approximately 241 km of the San Juan River downstream from Shiprock, New Mexico, to the Lake Powell inflow (Holden 1999). 991-077.080 Wright Water Engineers, Inc. Page 2 November 2003