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541 This would be most apparent in the reach of river upstream from the Animas River confluence. 542 543 SPECIES ACCOUNTS 544 The following sections address the effects of the proposed action on threatened and endangered 545 species, candidate species, and other species of special status. Table 3 summarizes the findings 546 of this assessment. Information is provided on species distribution and habitat needs, and 547 impacts of the proposed operation changes are presented. For some species, there is an 548 abundance ofliterature on habitat requirements and other factors; this assessment summarizes 549 appropriate information and the reader should refer to technical reports and papers for detailed 550 information. 551 552 Endangered Species 553 Colorado oikeminnow 554 The Colorado pikeminnow is endemic to the Colorado River system and occurs in low numbers 555 in the Green River and the Colorado River upstream from Lake Powell and in their major 556 tributaries. The species does not reproduce in reservoirs and construction of Glen Canyon Dam 557 has isolated the San Juan River population from other Upper Colorado River populations since 558 the 1960's. 559 According to reports reviewed in Holden (1999), there is little information on historical 560 abundance in the San Juan River although anecdotal information suggests the pikeminnow was 561 common and extended upstream into what is now Navajo Reservoir. Based on SJRBRlP 562 surveys, there are likely fewer than 100 adult pikeminnows and maybe fewer than 50 reported in 563 Holden (1999). Wild pikeminnow numbers are probably now lower. 564 Critical habitat has been designated for the pikeminnow along the lower San Juan River as 565 follows: 566 New Mexico, San Juan County, and Utah, San Juan County. The San Juan River and its 567 100-year flood plain from the State Route 371 bridge in T.29N., R.13W., section 17 568 (New Mexico Meridian) to Neskahai Canyon in the San Juan arm of Lake Powell in 569 TAl S., R.II E., section 26 (Salt Lake Meridian) up to the full pool elevation. 570 Ryden (2000) reported on the present status of the fish in the San Juan. Only 19 wild (not 571 stocked) pikeminnows were located during SJRBRlP electro fishing surveys between 1991 and 572 I 996-most were found in the relatively short reach of river between the Mancos River 573 confluence and the Cudei Diversion Dam (RM 120-145). In addition to actual captures, 12 574 pikeminnow were observed, mostly between the Four Corners and the Cudei Diversion. The 19 "