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<br />o <br />c:~ Fish Sampling 1970 - 1979 <br />l'~ <br /> <br />( " <br /> <br />,.;::.. San Juan Tributaries downstream of Navajo Reservoir <br />C) <br /> <br />Between 1970 and 1979 a considerable amount of sampling was conducted in tributaries <br />of the San Juan, Rivers that were sampled included the Animas, Florida, La Plata, <br />Mancos, Los Pinos, Navajo and Piedra rivers. Some smaller streams were also sampled <br />during the 1970s including Cherry Creek, Long Hollow Creek, Navajo Wash and <br />McElmo Creek, The presence or absence of various species was dependent on river <br />system as well as elevation, <br /> <br />Animas River. During the ] 970s the Animas River was sampled 24 times at locations <br />that ranged from south of Durango near highway 160 to it's confluence with the San Juan <br />River. Native fish were most consistently present in collections in the reach between the <br />San Juan confluence and the Colorado - New Mexico state line (reach I), The native fish <br />species that were collected in this reach included the bluehead sucker, flannelmouth <br />sucker, mottled sculpin, and speckled dace, Non-native species, with the exception of the <br />fathead minnow, were less common in collections from this area, Non-native fish <br />occurring in reach I during this time period consisted of common carp, black bullhead, <br />plains killifish, rainbow trout, fathead minnow, and brown trout. The section of the <br />Animas River from Durango downstream to the state line (reach 2) supported the same <br />native fish species as reach I; however, the flannel mouth sucker was only present on one <br />sampling occasion, Four non-native fish appeared in collections within this reach, Three <br />of these non-native species (rainbow trout, cutthroat trout, and fathead minnow) were not <br />consistently reported from sampling efforts in this area, The brown trout was the only <br />non-native fish commonly found in samples from reach 2. No roundtail chubs were <br />collected from the Animas River during this time period. <br /> <br />Florida River. The Florida River was sampled two times during the 1970s, and only the <br />results of one occasion (11 Dec, 1975 at the highway 160 bridge) provided enumerated <br />fish data. Results of this sampling effort indicated the presence of three native fish <br />species; bluehead sucker, flannelmouth sucker and speckled dace, and two non-native <br />fish species; rainbow trout and brown trout. <br /> <br />La Plata River, The La Plata River was sampled 21 times at sites ranging from highway <br />160 to it's confluence with the San Juan River during the 1970s, Eighteen of these <br />sampling events took place between the Colorado - New Mexico border and the San Juan <br />River (reach I), Fish commonly collected within this area included native fish (bluehead <br />sucker, flannelmouth sucker, and speckled dace), and non-native fish (plains killifish and <br />fathe<ld minnow). Two other fish that were uncommon (only one individual was <br />collected in 18 sampling events) in this reach were roundtail chub and the red shiner <br />(Table 4). The remaining three sampling events were conducted in 1975 at locations that <br />were dispersed over approximately equal distances between the state line and highway <br />160. Fish species collected at the location immediately north of the state line were <br />similar to those collected at the lower sites with the addition of one non-native species <br /> <br />Draft Final Tributary Report <br />Miller Ecological Consultants, Inc. <br /> <br />January 31, 2000 <br />Page 8 <br />