Final Report 

Ichthyofaunal Surveys of Tributaries 

of the San Juan River, New Mexico 

Prepared by: 

William J. Miller and David E. Rees 

Miller Ecological Consultants, Inc. 

1401 Riverside Avenue, Suite 3 

Fort Collins, Colorado 80524 

970-224–4505 

January 31, 2000 

MILLER ECOLOGICAL 

CONSULTANTS, INC. 
Final Report 

Ichthyofaunal Surveys of Tributaries 

of the San Juan River, New Mexico 

Prepared by: 

William J. Miller and David E. Rees 

Miller Ecological Consultants, Inc. 

1401 Riverside Avenue, Suite 3 

Fort Collins, Colorado 80524 

970-224–4505 

January 31, 2000 
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Miller Ecological Consultants, Inc. Page i 

EXECUTIVE SUMMARY 

Historical surveys of fish fauna have been conducted on most major tributaries of the 

upper San Juan River (Smith 1976, Anderson et al. 1993). Fish surveys that were 

conducted prior to 1970 are rare, however during the 1970’s fish surveys became much 

more common and expanded into most drainages. 

The objectives of this report were: 1) to compile historical fish collection information for 

the tributaries to the San Juan River downstream of Navajo Dam; 2) compile data 

collected as part of this project during the years 1992 – 1994; and 3) to compile, as 

practicable, collections made upstream of Navajo reservoir during the study period 1992 - 

1994. Many of the fish collections that have occurred since 1994 are included in this 

report, however, these were not included as part of the original scope of work or 

objectives for this project. 

This study area included all major tributaries of the San Juan River that originate in 

Colorado. The downstream boundary of tributaries within the study area was their point 

of confluence with the San Juan River. The results of some surveys conducted on the 

San Juan River upstream of Navajo Reservoir have also been provided. Tributaries of the 

San Juan River that were represented in these results include; the Animas, Florida, La 

Plata, Los Pinos, Mancos, Navajo, and Piedra rivers and Mc Elmo Creek. Also included 

were several smaller creeks or streams that are tributaries of the larger rivers. The 

smaller streams that were sampled consisted of Cherry Creek, Long Hollow Creek, Rock 

Creek, Stollsteimer Creek, and Navajo Wash. 

The data presented in this report are the result of two main sources of information. These 

sources consist of: 1) a literature review of historical fish surveys and, 2) data collected 

by Miller Ecological Consultants (MEC) as part of a native fish habitat study (Miller et 

al. 1995). The literature review includes historical reports of fish surveys in the 

previously mentioned tributaries of the San Juan River. 

Historical studies of fish in tributaries of the San Juan River provide an account of native 

and non-native species composition during a period of non-native introduction. The 

Animas River has been the site of more historical fish surveys and earlier sampling 

events than other tributaries. The earliest recorded sampling events (and other 

unconfirmed early reports) in the Animas River included only records of native fish 

species. By the 1950s, non-native fish had been detected in a reach of the Animas River 

upstream of the Colorado border. Non-native species have persisted in the Animas River 

since they were first reported; however, the composition and number of species have 

changed. 

Because there are few records of fish surveys in other tributaries prior to 1970, it is likely 

that some non-native fish were already established in various tributaries before they were 

reported. However, one of the earliest surveys from the La Plata River (1966) only 

provided evidence of the existence of native fish. Although some non-native species had 
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Miller Ecological Consultants, Inc. Page ii 

been stocked in the La Plata River prior to this time, most non-native species were 

probably not established over a widespread area. 

The expansion of non-native fish in tributaries of the upper San Juan River has been 

concurrent with a decline in certain native fish species. There have been several 

historical reports that suggest that native fish may have been relatively abundant in areas 

where recent surveys indicated they were rare or nonexistent (Jordan 1891, Koster 1957, 

Dean 1961, Olson 1962a). Several researchers have also commented on the decline of 

certain native species (Sublette 1977, Platania and Bestgen 1988, Platania and Young 

1990). In fact, the data presented here suggests that roundtail chubs may have been 

common in some reaches of the Animas River. A review of historical fish surveys 

suggests that the establishment of species (and species composition) is a dynamic 

process. Future surveys will be necessary answer more questions regarding the balance 

of native and non-native fish fauna in tributaries of the upper San Juan River. 
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Table of Contents 

Executive Summary............................................................................................................. i

Introduction......................................................................................................................... 1 

Animas ............................................................................................................................ 2 

Study Area ...................................................................................................................... 2 

Methods............................................................................................................................... 3 

Results................................................................................................................................. 6 

Historical fish collections in tributaries of the San Juan River....................................... 6 

Fish Sampling 1950 - 1969............................................................................................. 6 

Fish Sampling 1970 - 1979............................................................................................. 8 

San Juan Tributaries downstream of Navajo Reservoir.............................................. 8 

San Juan Tributaries upstream of Navajo Reservoir................................................. 13 

Fish Sampling 1980 - 1989........................................................................................... 15 

San Juan Tributaries Downstream of Navajo Reservoir........................................... 15 

San Juan Tributaries Upstream of Navajo Reservoir................................................ 16 

Fish Sampling 1990 - 1994........................................................................................... 17 

San Juan Tributaries Downstream of Navajo Reservoir........................................... 17 

San Juan Tributaries Upstream of Navajo Reservoir................................................ 18 

Fish Sampling 1995-1999............................................................................................. 19 

Discussion......................................................................................................................... 20 

Historical Fish Distribution........................................................................................... 20 

Native Fishes............................................................................................................. 20 

Non-native Fishes ..................................................................................................... 22 

CONCLUSIONS............................................................................................................... 26 

Literature Cited ................................................................................................................. 27 

Appendix A......................................................................................................................... 1 
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List of Figures 

Figure 1. Study Area for Ichthyofaunal Surveys. .............................................................. 4 

List of Tables 

Table 1. Number of collections by decade made in tributaries of the San Juan River. ..... 2 

Table 2. Fish Species Codes. ............................................................................................. 5 

Table 3 Historical Relative Abundance Assessments of Fish Species by Decade in the 

Animas River. ............................................................................................................... 7 

Table 4. Historical Relative Abundance Assessments of Fish Species by Decade in the 

La Plata River. ............................................................................................................ 10 

Table 5. Historical Relative Abundance Assessments of Fish Species by Decade in the 

Mancos River (including Navajo Wash)..................................................................... 11 

Table 6. Historical Relative Abundance Assessments of Fish Species by Decade in Mc 

Elmo Creek. ................................................................................................................ 12 

Table 7. Historical Relative Abundance Assessments of Fish Species by Decade in 

tributaries upstream of Navajo Reservoir (Los Pinos River, Navajo River, and Piedra 

River). ......................................................................................................................... 14 
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INTRODUCTION 

Historical surveys of fish fauna have been conducted on most major tributaries of the 

upper San Juan River (Smith 1976, Anderson et al. 1993). Fish surveys that were 

conducted prior to 1970 are rare, however during the 1970’s fish surveys became much 

more common and expanded into most drainages (Table 1). Only well documented 

surveys are presented in this study, although there have been numerous unconfirmed or 

“hearsay” reports. Most of the unconfirmed reports suggest that the native fish were once 

more numerous and widespread in distribution (Koster 1957). Some of the fish surveys 

presented here support this premise. In most cases historical surveys of fish fauna 

document the introduction and distribution of non-native fish species. Data for this report 

were supplied by the Colorado Division of Wildlife, New Mexico Department of Game 

and Fish, U.S. Fish and Wildlife Service, Utah Department of Wildlife and Southern Ute 

Indian Tribe. 

The objectives of this report were: 1) to compile historical fish collection information for 

the tributaries to the San Juan River downstream of Navajo Dam; 2) compile data 

collected as part of this project during the years 1992 – 1994; and 3) to compile, as 

practicable, collections made upstream of Navajo reservoir during the study period 1992 - 

1994. Many of the fish collections that have occurred since 1994 are included in this 

report, however, these were not included as part of the original scope of work or 

objectives for this project. 

The primary objectives and goals of biologists have varied since fish fauna sampling 

began in this drainage. Many of the early objectives included the eradication of native 

fish species, and the introduction of non-native game species. Olson (1962a) reported 

that lethal levels of rotenone were used to eliminate native fish from sections of the Los 

Pinos, Navajo, and San Juan rivers. Several other reports from this time period 

recommend that non-native species be stocked in Navajo Reservoir and nearby sections 

of the San Juan drainage (Olson 1962b, Olson 1967, Graves and Haines 1968). Graves 

and Haines (1969) reported that prior to 1969, five non-native species including more 

than 1 million channel catfish and 4 million rainbow trout had been stocked into Navajo 

Reservoir. In fact, most of the sampling and fish related work prior to 1970 was directed 

toward the introduction of non-native fish or removal of native species. Native fish were 

often not reported during these early sampling events. After the late 1960s, the objectives 

for most fishery work in the San Juan drainage began to change. Although game fish 

species were important in many areas, the preservation of native species became an 

important objective as well. Smith (1976) conducted one of the earliest fish surveys that 

emphasized native and non-native fish populations. This work was followed by 

numerous studies that were designed to account for native as well as non-native species 

(Sublette 1977, Robertson 1977, Platania and Bestgen 1988, Platania 1990, Platania and 

Young 1990, Anderson, et al. 1993, Miller et al. 1995). Most fish fauna studies since the 

mid-1970s have emphasized the need for research involving native species. 
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The distribution of native and non-native species can be observed in the data provided by 

historical sampling. Earliest sampling efforts resulted in the capture of mostly native 

fish, while more recent sampling efforts have produced an increasing number of nonnative species. Distribution and composition of native and non-native fish in tributaries 

of the San Juan River is dependent on numerous physical and biological variables. A 

comparison of historical fish surveys provides valuable insight into temporal changes in 

fish populations and composition in tributaries of the San Juan River. 

Table 1. Number of collections by decade made in tributaries of the San Juan River. 

1934 – 1949 1950 - 1969 1970 - 1979 1980 - 1989 1990 - 1999 

Animas 

2 2 24 19 110 

Florida 2 9 21 

La Plata 1 24 2 80 

Mancos 13 10 29 

Mc Elmo 10 7 4 

Piedra 2 7 6 

Los Pinos 8 1 6 

Navajo 9 7 

San Juan 3 18 

Study Area 

The San Juan River is a major tributary of the Colorado River and drains 99,200 km2 in 

Colorado, Utah, Arizona, and New Mexico. From its origins in the San Juan Mountains 

of southwestern Colorado at elevations exceeding 4,250 m, the river flows westward for 

about 570 km to the Colorado River. The major perennial tributaries to the San Juan 

River are the Navajo, Piedra, Los Pinos, Animas, La Plata, and Mancos rivers, and 

McElmo Creek (Figure 1). In addition there are numerous ephemeral arroyos and washes 

contributing little total flow but large sediment loads. 

Navajo Reservoir, completed in 1963, impounds the San Juan River, isolating the upper 

124 km of river and partially regulating downstream flows. The completion of Glenn 

Canyon Dam and subsequent filling of Lake Powell in the early 1980’s inundated the 

lower 87 km of the river, leaving about 359 km of river between the two bounding 

features. 

This study area included all major tributaries of the San Juan River that originate in 

Colorado. The downstream boundary of tributaries within the study area was their point 

of confluence with the San Juan River. The results of some surveys conducted on the 

San Juan River upstream of Navajo Reservoir have also been provided. Tributaries of the 

San Juan River that were represented in these results include; the Animas, Florida, La 
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Miller Ecological Consultants, Inc. Page 3 

Plata, Los Pinos, Mancos, Navajo, and Piedra rivers and Mc Elmo Creek. Also included 

were several smaller creeks or streams that are tributaries of the larger rivers. The 

smaller streams that were sampled consisted of Cherry Creek, Long Hollow Creek, Rock 

Creek, Stollsteimer Creek, and Navajo Wash (Figure 1). 

METHODS 

The data presented in this report are the result of two main sources of information. These 

sources consist of: 1) a literature review of historical fish surveys and, 2) data collected 

by Miller Ecological Consultants (MEC) as part of a native fish habitat study (Miller et 

al. 1995). The literature review includes historical reports of fish surveys in the 

previously mentioned tributaries of the San Juan River. All fish species reported within 

the study area were assigned a species code (Table 2). 

Tables are provided that summarize relative abundance of each species during each 

decade by tributary. During each decade that a species was collected a letter 

corresponding to the relative abundance was provided. The letter “A” indicates that the 

species was numerically dominant or abundant in samples. The letter “C” indicates that 

the species was common but not numerically dominant. The letter “R” indicates that the 

species was rarely collected in that river during that decade. The letter “P” was used 

when a species was reported in collections but numerical data were not provided. 

Historical data and data collected by MEC are provided in Appendix A. All data was 

organized by location and time period. Appendix A contains a table with fish capture 

information, and a corresponding table that provides specific locations of sampling sites. 

In some cases data was not available or provided for certain sampling events. In 

instances where a precise date was not provided only the year was listed. When sampling 

events occurred but no fish were collected, the words “no fish” were placed in the column 

of the first fish species. Data that was considered questionable due to lack of information 

(site location, date, etc.) or was reported by inexperienced personnel was not presented in 

the results of this study. 

Some of the larger tributaries below Navajo Reservoir have site locations that range over 

considerable distances. In these instances there was a noticeable change in species 

composition that probably resulted from change in elevation and gradient. These streams 

were divided into reaches based on changes in general physical characteristics. The data 

that is presented in Appendix A was sorted by reach and date. 
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Table 2. Fish Species Codes. 

CODE SCIENTIFIC NAME COMMON NAME 

Salmonidae 

ONCCLA Oncorhynchus clarki Cutthroat Trout 

ONCMYK Oncorhynchus mykiss Rainbow Trout 

ONCNER Oncorhynchus nerka Kokanee Salmon 

SALFON Salvelinus fontinalis Brook Trout 

SALTRU Salmo trutta Brown Trout 

TRUXFON Salmo trutta x Salvelinus fontinalis Tiger Trout 

Cyprinidae 

CYPLUT Cyprinella lutrensis Red Shiner 

CYPCAR Cyprinus carpio Common Carp 

GILROB* Gila robusta Roundtail Chub 

NOTCRY Notemigonus crysoleucas Golden Shiner 

PIMPRO Pimephales promelas Fathead Minnow 

RHIOSC* Rhinichthys osculus Speckled Dace 

Catostomidae 

CATCOM Catostomus commersoni White Sucker 

CATDIS* Catostomus discobolus Bluehead Sucker 

CATLAT* Catostomus latipinnis Flannelmouth Sucker 

SUCKER Unidentified Sucker 

SUCKERX Hybrid Sucker 

Ictaluridae 

AMEMEL Ameiurus melas Black Bullhead 

ICTPUN Ictalurus punctatus Channel Catfish 

Cyprinodontidae 

FUNZEB Fundulus zebrinus Plains killifish 

Poeciliidae 

GAMAFF Gambusia affinus Mosquitofish 

Centrarchidae 

LEPCYA Lepomis cyanellus Green Sunfish 

MICDOL Micropterus dolomieu Smallmouth Bass 

Cottidae 

COTBAI* Cottus bairdi Mottled Sculpin 

*Native species 
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RESULTS 

Historical fish collections in tributaries of the San Juan River 

The earliest credible fish surveys within the study area were conducted in the Animas 

River during 1934 and 1940. The locations for both of these sampling sites were between 

Aztec and Farmington. Collections confirmed the presence of Catostomus latipinnis

(flannelmouth sucker), Gila robusta (roundtail chub), Rhinichthys osculus (speckled 

dace), and Catostomus discobolus (bluehead sucker). The latter two species were only 

collected in the 1934 sample. All fish reported during these sampling occasions were 

native fish (Table 3). 

Fish Sampling 1950 - 1969 

Several sampling efforts were conducted on tributaries of the San Juan between 1950 and 

1969. Most of the sites occurred on the Animas River; however, unlike the previous 

efforts these site locations were all located upstream from Aztec. Fish species in these 

collections consisted of native fish (flannelmouth sucker, bluehead sucker, Cottus bairdi

(mottled sculpin), speckled dace, and roundtail chub) and the addition of six non-native 

fish species; Catostomus commersoni (white sucker), Cyprinella lutrensis (red shiner), 

Oncorhynchus mykiss (rainbow trout), Pimephales promelas (fathead minnow), Salmo 

trutta (brown trout), and Gambusia affinus (mosquitofish). The La Plata was also 

sampled once during 1966. Fish collected in the La Plata were all native species 

(flannelmouth sucker, bluehead sucker, and speckled dace). Roundtail chub were 

collected during only one sampling event within this time period. Fifteen individuals 

were collected on 15 Nov. 1963 at a location 1 mile North of Cedar Hill in the Animas 

River. 

During 1961, fish sampling was also conducted on the San Juan River to provide preimpoundment data on existing fish species (Olson 1962b). Results of these sampling 

efforts are noteworthy because they indicate the presence of Colorado pikeminnow and 

roundtail chub within an area which is now inundated. Olson (1968) later reported that 

roundtail chub constituted a large proportion (up to 77%) of gill net collections made at 

seven locations within Navajo Reservoir. 
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Miller Ecological Consultants, Inc. Page 7 Table 3 Historical Relative Abundance Assessments of Fish Species by Decade in the Animas River. Species 1930 - 1939 1940 - 1949 1950 - 1959 1960 - 1969 1970 - 1979 1980 Native Fish Roundtail Chub C C - C - Speckled Dace A - A C A Bluehead Sucker R - - R A Flannelmouth Sucker C C - C A Mottled Sculpin - - A R A NonNative Fish Cutthroat Trout - - - - R Rainbow Trout - - R - P Kokanee Salmon - - - - - Brook Trout - - - - - Brown Trout - - R - C Red Shiner - - P - - Common Carp - - - - P Golden Shiner - - - - - Fathead Minnow - - P - C White Sucker - - - R - Black Bullhead - - - - P Channel Catfish - - - - - Plains killifish - - - - P Mosquitofish - - - C - Green Sunfish - - - - - Smallmouth Bass - - - - - P = present, abundance unknown, A = abundant, C = common, R = rare, - = not encountered. 
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Fish Sampling 1970 - 1979 

San Juan Tributaries downstream of Navajo Reservoir 

Between 1970 and 1979 a considerable amount of sampling was conducted in tributaries 

of the San Juan. Rivers that were sampled included the Animas, Florida, La Plata, 

Mancos, Los Pinos, Navajo and Piedra rivers. Some smaller streams were also sampled 

during the 1970s including Cherry Creek, Long Hollow Creek, Navajo Wash and 

McElmo Creek. The presence or absence of various species was dependent on river 

system as well as elevation. 

Animas River. During the 1970s the Animas River was sampled 24 times at locations 

that ranged from south of Durango near highway 160 to it’s confluence with the San Juan 

River. Native fish were most consistently present in collections in the reach between the 

San Juan confluence and the Colorado - New Mexico state line (reach 1). The native fish 

species that were collected in this reach included the bluehead sucker, flannelmouth 

sucker, mottled sculpin, and speckled dace. Non-native species, with the exception of the 

fathead minnow, were less common in collections from this area. Non-native fish 

occurring in reach 1 during this time period consisted of common carp, black bullhead, 

plains killifish, rainbow trout, fathead minnow, and brown trout. The section of the 

Animas River from Durango downstream to the state line (reach 2) supported the same 

native fish species as reach 1; however, the flannelmouth sucker was only present on one 

sampling occasion. Four non-native fish appeared in collections within this reach. Three 

of these non-native species (rainbow trout, cutthroat trout, and fathead minnow) were not 

consistently reported from sampling efforts in this area. The brown trout was the only 

non-native fish commonly found in samples from reach 2. No roundtail chubs were 

collected from the Animas River during this time period. 

Florida River. The Florida River was sampled two times during the 1970s, and only the 

results of one occasion (11 Dec. 1975 at the highway 160 bridge) provided enumerated 

fish data. Results of this sampling effort indicated the presence of three native fish 

species; bluehead sucker, flannelmouth sucker and speckled dace, and two non-native 

fish species; rainbow trout and brown trout. 

La Plata River. The La Plata River was sampled 21 times at sites ranging from highway 

160 to it’s confluence with the San Juan River during the 1970s. Eighteen of these 

sampling events took place between the Colorado - New Mexico border and the San Juan 

River (reach 1). Fish commonly collected within this area included native fish (bluehead 

sucker, flannelmouth sucker, and speckled dace), and non-native fish (plains killifish and 

fathead minnow). Two other fish that were uncommon (only one individual was 

collected in 18 sampling events) in this reach were roundtail chub and the red shiner 

(Table 4). The remaining three sampling events were conducted in 1975 at locations that 

were dispersed over approximately equal distances between the state line and highway 

160. Fish species collected at the location immediately north of the state line were 

similar to those collected at the lower sites with the addition of one non-native species 
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(brown trout). Fish collections located in the upper reaches of the La Plata were 

dominated by native fish (mottled sculpin and speckled dace). Non-native fish at these 

sites included rainbow trout, fathead minnow, brook trout and brown trout. No roundtail 

chubs were collected upstream of the state line during this time period. 

Two tributaries of the La Plata River were sampled at three locations during this decade. 

Two sample sites at Long Hollow Creek produced numerous individuals of the native 

species bluehead sucker and speckled dace. The one sampling event on Cherry Creek 

indicated the presence of three native fish: bluehead sucker, mottled sculpin and 

speckled dace. 

Mancos River. Fish sampling was conducted on nine occasions in the Mancos River 

between 1970 and 1979 (Table 5). Collection events on the lower Mancos near the stateline established the presence of two native fish (flannelmouth sucker and speckled dace), 

and three non-native fish (common carp, red shiner and channel catfish). Site locations 

further upstream, above the bridge at Highway 666, produced the same native fish 

species as the lower sites with the addition of the bluehead sucker and roundtail chub. 

Non-native fish species in this reach consisted of the red shiner, channel catfish, and 

fathead minnow. At the site locations furthest upstream (near highway 160), fish 

collections produced bluehead sucker, mottled sculpin, speckled dace and one 

flannelmouth sucker. Non-native fish reported from the upper reach of the Mancos River 

included the rainbow trout and fathead minnow. 

Navajo Wash, a tributary to the Mancos, was also sampled on four occasions from 1970 

to 1979. Bluehead sucker, flannelmouth sucker, speckled dace and roundtail chub were 

common in collections during this time. Non-native fish that were collected included the 

common carp, red shiner, channel catfish, and rainbow trout. 

Mc Elmo Creek. Fish sampling was conducted on ten occasions at Mc Elmo Creek 

between 1970 and 1979. Upstream locations on Mc Elmo Creek appeared to have lower 

numbers of fish than sites located near the San Juan River confluence. Native fish that 

most consistently occurred in samples from Mc Elmo Creek included flannelmouth 

sucker and speckled dace. Three non-native fish (common carp, red shiner, and fathead 

minnow) were also common in fish collections (Table 6). Two native fish (bluehead 

sucker and mottled sculpin) additionally occurred in fish collections but not with 

regularity. 
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Miller Ecological Consultants, Inc. Page 10 Table 4. Historical Relative Abundance Assessments of Fish Species by Decade in the La Plata River. Species 1930 - 1939 1940 - 1949 1950 - 1959 1960 - 1969 1970 - 1979 1980 Native Fish Roundtail Chub - R Speckled Dace C A Bluehead Sucker C C Flannelmouth Sucker C C Mottled Sculpin - C NonNative Fish Cutthroat Trout - - Rainbow Trout - R Kokanee Salmon - - Brook Trout - R Brown Trout - R Red Shiner - R Common Carp - - Golden Shiner - - Fathead Minnow - A White Sucker - - Black Bullhead - - Channel Catfish - - Plains killifish - C Mosquitofish - - Green Sunfish - - Smallmouth Bass - - P = present, abundance unknown, A = abundant, C = common, R = rare, - = not encountered. 
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Miller Ecological Consultants, Inc. Page 11 Table 5. Historical Relative Abundance Assessments of Fish Species by Decade in the Mancos River (incluSpecies 1930 - 1939 1940 - 1949 1950 - 1959 1960 - 1969 1970 - 1979 1980 Native Fish Roundtail Chub P Speckled Dace A Bluehead Sucker C Flannelmouth Sucker C Mottled Sculpin C NonNative Fish Cutthroat Trout - Rainbow Trout R Kokanee Salmon - Brook Trout - Brown Trout - Red Shiner C Common Carp P Golden Shiner - Fathead Minnow C White Sucker - Black Bullhead - Channel Catfish R Plains killifish - Mosquitofish - Green Sunfish - Smallmouth Bass - P = present, abundance unknown, A = abundant, C = common, R = rare, - = not encountered. 
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Miller Ecological Consultants, Inc. Page 12 Table 6. Historical Relative Abundance Assessments of Fish Species by Decade in Mc Elmo Creek. Species 1930 - 1939 1940 - 1949 1950 – 1959 1960 - 1969 1970 – 1979 1980 – 1Native Fish Roundtail Chub - Speckled Dace C Bluehead Sucker P Flannelmouth Sucker C Mottled Sculpin R NonNative Fish Cutthroat Trout - Rainbow Trout - Kokanee Salmon - Brook Trout - Brown Trout - Red Shiner C Common Carp C Golden Shiner - Fathead Minnow - White Sucker - Black Bullhead - Channel Catfish - Plains killifish - Mosquitofish - Green Sunfish - Smallmouth Bass - P = present, abundance unknown, A = abundant, C = common, R = rare, - = not encountered. 
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San Juan Tributaries upstream of Navajo Reservoir 

Los Pinos River. The Los Pinos was sampled on eight occasions during the 1970s. Site 

locations ranged from highway 160 down to Navajo Reservoir. Fish collections included 

native fish (bluehead sucker, flannelmouth sucker, mottled sculpin, and speckled dace) 

and non-native fish (white sucker, rainbow trout, and brown trout). The white sucker was 

the least common of all species collected in the Los Pinos during the 1970s. Only three 

specimens were collected during eight sampling occasions. Species that were most 

consistently captured during this time period include the mottled sculpin, speckled dace, 

and brown trout. 

Navajo River. The Navajo River was sampled on nine occasions between 1970 and 

1979. Site locations ranged from Juanita, Colorado (near the confluence with the San 

Juan River) upstream to Chromo, Colorado (near the Navajo River headwaters). Results 

of sampling efforts indicated the presence of five native fish (roundtail chub, bluehead 

sucker, flannelmouth sucker, mottled sculpin, and speckled dace), and five non-native 

fish (white sucker, rainbow trout, fathead minnow, brown trout, and brook trout). Most 

consistently present in fish collections was the mottled sculpin and speckled dace. 

Roundtail chubs were only collected at the location near Juanita, Colorado. The white 

sucker was the most consistently occurring non-native species. Only one specimen of 

common carp was collected during this time period. 

Piedra River. The Piedra River was only sampled on two occasions during the 1970s. 

Native fish that were represented in collections included; bluehead sucker, mottled 

sculpin and speckled dace. Non-native fish collected in the Piedra included the white 

sucker, cutthroat trout, rainbow trout and brown trout. Flannelmouth suckers were not 

present during these collection events in the Piedra River. 

General trends in fish collections during 1970 - 1979 indicated that native fish generally 

dominate the collections, but several non-native fish species had become established in 

tributaries of the San Juan River. The white sucker was most common in the tributaries 

upstream of Navajo Reservoir. Mottled sculpin and trout species were more abundant at 

higher elevations, while other fish species seemed to prefer the mid to lower stream 

reaches. Roundtail chub were collected in the La Plata, Mancos, and Navajo River 

systems. White sucker were collected in the Los Pinos, Navajo, and Piedra River 

systems. Table 7 provides a summary of fish abundance estimates in tributaries upstream 

of Navajo Reservoir. The San Juan River upstream of Navajo Reservoir was not sampled 

during the 1970s.
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Miller Ecological Consultants, Inc. Page 14 Table 7. Historical Relative Abundance Assessments of Fish Species by Decade in tributaries upstream of (Los Pinos River, Navajo River, and Piedra River). Species 1930 - 1939 1940 - 1949 1950 – 1959 1960 - 1969 1970 – 1979 1980 – 1Native Fish Roundtail Chub - Speckled Dace C Bluehead Sucker C Flannelmouth Sucker C Mottled Sculpin A NonNative Fish Cutthroat Trout R Rainbow Trout C Kokanee Salmon - Brook Trout - Brown Trout C Red Shiner - Common Carp - Golden Shiner R Fathead Minnow R White Sucker C Black Bullhead - Channel Catfish - Plains killifish - Mosquitofish - Green Sunfish - Smallmouth Bass - P = present, abundance unknown, A = abundant, C = common, R = rare, - = not encountered. 
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Fish Sampling 1980 - 1989 

During the decade 1980-1989 sampling events continued on tributaries to the San Juan 

River. Rivers that were sampled included the Animas, Florida, La Plata, and Piedra. 

Smaller streams that were sampled included Mc Elmo Creek, Navajo Wash, and Rock 

Creek (a tributary to the Los Pinos River). The San Juan River upstream of Navajo 

Reservoir was also sampled. Data from several sampling events during this decade was 

either unavailable or not recorded. Those sampling occasions will be excluded from the 

following discussion. 

San Juan Tributaries Downstream of Navajo Reservoir 

Animas River. The Animas River was sampled four times in reach 1 and fifteen times in 

reach 2 between 1980 and 1989. Native fish collected in reach 1 included bluehead 

sucker, flannelmouth sucker, mottled sculpin, speckled dace and roundtail chub. Nonnative fish collected in reach 1 included white sucker, common carp, red shiner, 

mosquitofish, fathead minnow, rainbow trout and brown trout. Native fish in reach 2 

consisted of bluehead sucker, flannelmouth sucker, mottled sculpin, and speckled dace. 

Non-native fish included the white sucker, common carp, cutthroat trout, rainbow trout, 

and brown trout. 

During the 1980s there were some noticeable changes in the presence and absence of fish 

species in the Animas River. Black bullhead and plains killifish had been collected on 

several occasions during the 1970s, but did not occur in any collections during the 1980s. 

Red shiner were recorded for the first time since 1954, and white suckers were present in 

over 30% of the fish collections from the Animas River. Only one roundtail chub was 

collected between 1980 and 1989. It was collected within a 2.5 mile section of reach 1 

located between Bondad bridge and Cogburn. This was the first occasion on which a 

roundtail chub had been collected in the Animas River since 15 Nov. 1963. 

Florida River. The Florida River was sampled on nine occasions between 1980 and 

1989. Native fish present in collections were similar to those collected during the 1970s 

with the addition of two species (flannelmouth sucker and roundtail chub). Two nonnative fish (fathead minnow and white sucker) that had not previously been collected in 

the Florida River were also present in fish collections. 

La Plata River. The La Plata River was only sampled two times during the 1980s. Both 

sampling occasions occurred during 1988 in the upper reaches (reach 3 and 4) of the 

river. Fish species present in collections were similar to those collected in upper reaches 

of the La Plata during the 1970s. Native fish collected included flannelmouth sucker, 

mottled sculpin, and speckled dace. Non-native species included fathead minnow, 

rainbow trout, brook trout, and brown trout. 

Mancos River. The Mancos River and one tributary (Navajo Wash) were sampled a 

total of ten times between 1980 and 1989. The presence, absence, and distribution of 
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Miller Ecological Consultants, Inc. Page 16 

species was similar to results reported during the 1970s. In the lower two reaches of the 

Mancos River (reach 1 and 2) four native fish species were collected in samples. These 

fish included bluehead sucker, flannelmouth sucker, roundtail chub and speckled dace. 

Native fish in the upper Mancos (reach 3) consisted of bluehead sucker, mottled sculpin 

and speckled dace. Non-native fish species collected in the lower reaches included 

common carp, red shiner, channel catfish, and rainbow trout. At site locations within 

reach 3 non-native fish that were collected included rainbow trout, brown trout, and 

fathead minnow. The two fish collections in Navajo Wash produced bluehead sucker, 

flannelmouth sucker, speckled dace and roundtail chub. Only native fish were collected 

in Navajo Wash during these sampling events. Roundtail chubs were present in both of 

the samples taken at Navajo Wash, and in all but one of the collections taken from the 

lower two reaches of the Mancos River during this time period. 

Mc Elmo Creek. Mc Elmo Creek was sampled on seven occasions between 1980 and 

1989. The presence and absence of various fish species was similar to data recorded 

during the 1970s. Native fish collected included bluehead sucker, flannelmouth sucker, 

and speckled dace. Non-native fish included common carp, red shiner, and speckled 

dace. 

San Juan Tributaries Upstream of Navajo Reservoir 

Piedra River. The Piedra River was sampled on seven occasions during the 1980s. 

Native fish collected included bluehead sucker, flannelmouth sucker, mottled sculpin and 

speckled dace. Non-native fish that were common in collections included rainbow trout, 

brown trout, and white sucker. Three non-native fish that were collected but considered 

uncommon in occurrence (each collected only once in seven sampling occasions) 

included the fathead minnow, channel catfish, and cutthroat trout. Two sampling events 

during 1983 reported that the white sucker was the most common fish in collections. 

Los Pinos River. The Los Pinos River was not sampled between 1980 and 1989, 

however one location on Rock Creek, a tributary to the Los Pinos, was sampled. One 

native fish (the speckled dace) and two non-native fish (fathead minnow and white 

sucker) were collected. 

San Juan River. The San Juan River upstream from Navajo Reservoir was sampled on 

three occasions between 1980 and 1989. Results of fish collections indicated the 

presence of four native fish species (bluehead sucker, flannelmouth sucker, mottled 

sculpin, and speckled dace), and two non-native species (rainbow trout and brown trout). 

General trends in fish collections between 1980 - 1989 indicated that the presence and/or 

absence of native fish was more consistent among collections than non-native fish 

species. The white sucker appeared to become more prominent in collections, while 

black bullhead and plains killifish were not found in any collections during this period. 

White sucker were reported from the Animas, Florida, Piedra, Los Pinos, and San Juan 

river systems. Roundtail chub were collected in the Animas, Florida, and Mancos river 

systems. 
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Miller Ecological Consultants, Inc. Page 17 

Fish Sampling 1990 - 1994 

Between 1990 and 1994 there were more recorded fish collections on tributaries to the 

San Juan River than occurred in all the years prior to 1990 combined. Rivers that were 

sampled included the Animas, Florida, La Plata, Mancos, Los Pinos, Navajo, Piedra, and 

San Juan. Smaller streams reported here included Cherry Creek, Long Hollow Creek, Mc 

Elmo Creek, and Stollsteimer Creek. 

San Juan Tributaries Downstream of Navajo Reservoir 

Animas River. Recorded sampling efforts in the Animas River indicate that this stream 

was sampled at least 70 times during the early 1990s. Native fish that appear to be 

common throughout the Animas River include the bluehead sucker, flannelmouth sucker, 

mottled sculpin and speckled dace. Only one individual of roundtail chub was collected 

on one occasion during this time period. This suggests that this species has become rare 

in occurrence in the Animas River. Non-native fish that occurred commonly in 

collections included the common carp, white sucker, rainbow trout, brown trout, and in 

the upper reaches cutthroat trout. Fathead minnows and green sunfish were also 

collected, but on a less frequent basis. 

Florida River. The Florida River has been sampled 21 times since 1990. Native fish 

collected included the bluehead sucker, flannelmouth sucker, mottled sculpin, speckled 

dace and roundtail chub. Although roundtail chubs were often present in collections they 

always constituted a small proportion of the total fish collected. Non-native fish in 

collections consisted of black bullhead, common carp, white sucker, green sunfish, 

fathead minnow, cutthroat trout, rainbow trout, and brown trout. Of the non-native fish 

collected the white sucker and brown trout were most common in occurrence. The white 

sucker (which was not found in collections made during the 1970s, and was the least 

common non-native fish collected during the 1980s) was found in more than 75% of all 

fish collections made on the Florida River during the early 1990s. 

La Plata River. Between 1990 and 1994 the La Plata River was sampled 68 times, and 

two tributaries (Cherry Creek and Long Hollow Creek) were sampled three times for a 

total of 71 sampling events in the La Plata drainage. Native fish that appear to be 

abundant throughout the La Plata River include the bluehead sucker, flannelmouth 

sucker, and speckled dace. Roundtail chub were present in some collections from reach 1 

and 2, however only one specimen was collected in reach 3. In a small section of reach 

2, from the state line north for about 2 miles, roundtail chubs were numerous in 

collections. Non-native fish collected in the La Plata consisted of rainbow trout, brown 

trout and fathead minnow. Other non-native species that were less common in 

collections included black bullhead, red shiner, and brook trout. The two sampling sites 

on Long Hollow Creek produced three native fish (bluehead sucker, flannelmouth sucker 

and speckled dace), and one non-native fish (brown trout). Only bluehead suckers were 

captured at the site on Cherry Creek. 
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Miller Ecological Consultants, Inc. Page 18 

Mancos River. The Mancos River was sampled 29 times, and in three different reaches 

during the early 1990s. Results of these sampling efforts were similar to results from 

previous decades. Native fish were generally more common in fish collections than nonnative fish. Native fish collected throughout the Mancos River consisted of bluehead 

sucker, flannelmouth sucker, speckled dace, roundtail chub, and in reach 3 mottled 

sculpin. Non-native fish consisted of common carp, red shiner, channel catfish, rainbow 

trout and fathead minnows. Most of the non-native fish were collected in reach 1 with 

the exception of rainbow trout which were only found in reach 3. Roundtail chub were 

relatively common in collections throughout the Mancos River. 

Mc Elmo Creek. Mc Elmo Creek was sampled on 4 occasions from 1990 to 1994. 

Results of sampling suggest that three native fish (bluehead sucker, flannelmouth sucker, 

and speckled dace) were common. One non-native fish (fathead minnow) was common 

in all collections. Three non-native fish (common carp, red shiner, and green sunfish) 

were collected less frequently. 

San Juan Tributaries Upstream of Navajo Reservoir 

Los Pinos River. The Los Pinos River was sampled six times during the early 1990s. 

Results of recent sampling are similar to the results of sampling from previous decades, 

especially regarding the presence of native fish. Native fish collected included bluehead 

sucker, flannelmouth sucker, mottled sculpin and speckled dace. The non-native fish 

(white sucker, rainbow trout, and brown trout) collected during the 1970s were all present 

in recent collections, however eight species of non-native fish that had not previously 

been collected in the Los Pinos River were detected during the 1990s. Non-native fish 

that were collected for the first time during the 1990s included the black bullhead, 

channel catfish, golden shiner, green sunfish, cutthroat trout, kokanee salmon, and 

fathead minnow. 

Piedra River. The results of six sampling events on the Piedra River during the early 

1990s suggest that there had been little change in fish composition since the early 1980s. 

Native fish in this system consisted of the bluehead sucker, flannelmouth sucker, mottled 

sculpin, and speckled dace. Non-native species included white sucker, rainbow trout, 

brown trout, and one species that had not previously been collected in the Piedra River, 

the common carp. Stollsteimer Creek (a tributary to the Piedra River) was sampled once 

in 1992. Results of the single sampling event indicated that four native fishes (bluehead 

sucker, flannelmouth sucker, mottled sculpin, and speckled dace) and two non-native fish 

(fathead minnow and white sucker) were present. 

Navajo River. During 1992 and 1993, a total of seven sampling events were conducted 

on the Navajo River. Fish species reported during these recent surveys were similar to 

those which were found during the 1970s with the exception of three non-native fish 

(black bullhead, common carp, and green sunfish) that were only found during recent 

sampling events. Other non-native fish that appear to be more established in the Navajo 

River included the white sucker, rainbow trout, fathead minnow, and brown trout. Native 
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Miller Ecological Consultants, Inc. Page 19 

fish that were present in most samples include the bluehead sucker, mottled sculpin, and 

speckled dace. The flannelmouth sucker was also collected, but only on two sampling 

occasions. 

San Juan River. The San Juan River upstream from Navajo Reservoir was sampled on 

18 occasions during the early 1990s. Four native fish species (bluehead sucker, 

flannelmouth sucker, mottled sculpin and speckled dace) were common in collections, 

while one native species (roundtail chub) was only present (usually in low numbers) 

during half of the sampling events. Nine non-native species (black bullhead, channel 

catfish, white sucker, common carp, smallmouth bass, fathead minnow, kokanee salmon, 

rainbow trout, and brown trout) were present in collections. The black bullhead, channel 

catfish, common carp, smallmouth bass and kokanee salmon are all species that had not 

been collected in the San Juan River prior to sampling conducted during the 1990s. The 

white sucker, rainbow trout, and brown trout were common in occurrence and seem to 

have well established populations. 

General trends in fish collections from 1990 to 1994 indicate that fish communities have 

undergone some changes in species composition in several tributaries to the San Juan. 

Roundtail chubs have been collected from the Animas, Florida, La Plata, and Mancos 

rivers downstream of Navajo Reservoir, and the Navajo and San Juan rivers upstream 

from Navajo Reservoir. In most of these systems however, roundtail chubs appear to be 

restricted to a few specific locations (possibly confined by altitude, habitat and 

competition with non-native fish). Prior to 1964 roundtail chubs were found in most of 

the samples taken at the Animas River, and non-native fish were rare. Samples taken 

during the early 1990s indicated that five non-native fish had become established in the 

Animas River, and roundtail chubs were reported in less than 2% of the sampling events. 

The white sucker appears to have established populations in the Animas, Florida, Los 

Pinos, Navajo, Piedra, and San Juan River upstream from Navajo Reservoir. From fish 

collection data it appears that the white sucker had become established in tributaries 

upstream from Navajo Reservoir, but was rarely collected in other streams during the 

1970s. Sampling during the 1990s indicated that the white sucker had become common 

in the Animas and Florida Rivers, but was still undetected in the Mancos River, La Plata 

River, and Mc Elmo Creek. 

Fish Sampling 1995-1999 

Fish sampling efforts have continued from 1995 through 1999 on the Animas, and La 

Plata rivers as part of the data collection effort for the proposed Animas La Plata Project 

(S. Whiteman, Southern Ute Indian Tribe, personal communication). Much of the recent 

work has been included in the data provided in Appendix A. Most of the 

presence/absence data was similar to data from previous years. The only new fish 

species located in these studies that was not previously reported was the johnny darter 

(Etheostoma nigrum). This species was collected from the Animas River during 1997 

and 1998. Most of the recent fish collection data from the Animas River support the 
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Miller Ecological Consultants, Inc. Page 20 

establishment of white suckers in that system. Some of this data suggests that the 

frequency of hybridization among suckers may be increasing. Results of recent 

collections from the La Plata River indicate that the fathead minnow may be the most 

abundant non-native species in that system. 

DISCUSSION 

Historical fish fauna surveys provide a temporal account of native and non-native 

species, and their abundance and composition. A brief discussion of distribution, 

abundance and habitat use for each species collected during historical fish surveys with in 

the study area is provided. 

Historical Fish Distribution 

Native Fishes 

Gila robusta (roundtail chub): Roundtail chub are native to the San Juan drainage. The 

earliest reports of this species in tributaries of the San Juan River came from collections 

made in the Animas River during 1934. Subsequent sampling efforts in the Animas 

River through 1963 indicated that a larger population than occurs today may have been 

present. Since 1963 more than 60 sampling attempts in the Animas River have resulted 

in the capture of only two specimens of roundtail chub. Apparently this species has 

become rare in the Animas River, and established populations that were found 

historically no longer occur. Since the early 1970s roundtail chubs have been reported in 

collections from the San Juan River above and below Navajo Reservoir, and from most 

tributaries to the San Juan River below Navajo Reservoir. Some of the largest 

populations were reported from the Mancos River and Navajo Wash. Representatives of 

this species have also been found in the Florida River (a tributary to the Animas), which 

may account for the occasional occurrence of this species in the Animas River. 

A habitat study to document seasonal habitat use by native species was conducted during 

1994 (Miller et al. 1995). The results of that study provide the habitat associations listed 

below. During the 1994 habitat study representatives of all size classes were present in 

the data. The young-of-year (YOY) size class was encountered primarily in low velocity 

habitats (glide and particularly pool habitat). Most of the roundtail chubs encountered 

during this study were within the juvenile size class. Juvenile and adult roundtail chubs 

in this study were mostly found inhabiting areas of low velocity. Roundtail chubs were 

typically found in pool habitat and were often associated with woody debris. Although 

few roundtail chub adults were collected during this study the trends in habitat use were 

similar to those observed by the juvenile size class. Most adult roundtail chubs were 

collected from pool habitat. Glide habitat was occasionally occupied, but no adults were 

collected from riffle habitat. 

Rhinichthys osculus (speckled dace): The speckled dace is a native fish in the San Juan 

River and its tributaries. Historically, this species has been one of the most frequently 

encountered fish in collections from the San Juan drainage. The earliest report of this 
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Miller Ecological Consultants, Inc. Page 21 

species in fish collections came from the Animas River during 1934. At this time it was 

reported as the most abundant species captured during the sampling event. Historical 

records from each decade suggest that the speckled dace has been one of the most 

numerous species in most tributaries of the San Juan River. Additionally, in larger 

tributaries where low numbers of speckled dace have been reported this species was 

probably under represented in the data because their small size makes them difficult to 

capture using certain sampling techniques. Speckled dace were common in fish 

collections throughout the 1994 habitat use study, however individuals representing the 

YOY age class were never collected. Juvenile and adult speckled dace were found 

occupying all three major habitat types. Habitat use data for juvenile speckled dace 

suggested that this size class occurred primarily in riffle habitat and areas of relatively 

high velocity. Large numbers of speckled dace in the adult size class were located in all 

three major habitat types. 

Catostomus discobolus (bluehead sucker): The bluehead sucker is native to the San Juan 

drainage. This species has been reported during most collections since the earliest 

sampling efforts in this drainage. The bluehead sucker has been reported from every 

major tributary of the San Juan River, and is often among the most abundant of the 

species collected. 

The bluehead sucker was well represented in collections by all three size classes during 

the habitat study. YOY bluehead suckers were found using all three major habitat types, 

however, most were collected from glide habitat. Juvenile bluehead suckers were mostly 

collected from pool habitat in the spring and glide habitat in the fall. Habitat use data 

compiled for adult bluehead suckers indicated that all three habitat types were again 

utilized, however most individuals were found in areas of relatively slow velocity. 

Catostomus latipinnis (flannelmouth sucker): Flannelmouth suckers are native to the San 

Juan drainage, and occur in all major tributaries. This species was well represented and 

often one of the dominant species in most historical sampling efforts from 1934 to the 

mid 1990s. The only locations where the flannelmouth sucker was absent or occurred in 

low numbers was at the most upstream site locations or in small tributaries. 

This species was well represented in collections by all three size classes during the 1994 

habitat study. YOY flannelmouth suckers were found using all three major habitats 

types, but most occurred in glide habitat. Although all three major habitat types were 

used by juvenile and adult flannelmouth sucker most were collected from areas of low 

velocity. 

Cottus bairdi (mottled sculpin): This species was reported from the Animas River in 

1961. Since then it has been reported from most tributaries of the San Juan River. This 

species appears to be most numerous in the Animas River and tributaries upstream from 

Navajo Reservoir. In tributaries below Navajo Reservoir, mottled sculpin populations 

were found to be locally common in areas of suitable habitat, particularly in the upstream 

reaches of the La Plata River. During the habitat use study this species was only 
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Miller Ecological Consultants, Inc. Page 22 

represented by individuals in the adult size class. These fish were collected from all three 

major habitat types, however most were found in glide habitat. 

Non-native Fishes 

Oncorhynchus clarki (cutthroat trout): Earliest reports of this species from fish surveys 

within the study area occurred during the 1970s when small numbers of cutthroat trout 

appeared in collections from the Animas and Piedra rivers. Since these early collections 

this species has also been reported from Los Pinos River, and Florida River. Historically, 

this species has been most common in collections from the upstream reaches of the 

Animas River. It is likely that most cutthroat trout occurred in samples as a result of 

attempts to stock this species as a game fish. Cutthroat trout were represented by few 

individuals during the habitat use study. Limited data suggests that this species frequents 

pool habitat. 

Oncorhynchus mykiss (rainbow trout): The rainbow trout is a non-native species which 

occurs in the San Juan River drainage. Historically, this species was heavily stocked as a 

game fish in most tributaries of the San Juan River. Rainbow trout were stocked in the 

Animas River on a yearly basis for nearly 25 years (Smith 1976), and more than 4 million 

rainbow trout were stocked into Navajo Reservoir between 1962 and 1968 (Graves and 

Haines 1969). The earliest report of this species within the study area came from fish 

collections on the Animas River during 1954. By 1980 rainbow trout had also been 

reported from the Florida, La Plata, and Mancos rivers, and every major tributary 

upstream of Navajo Reservoir. Size and number of fish obtained in some studies 

suggested that natural reproduction might have been occurring by the 1980s at higher 

elevations in some tributaries upstream of Navajo Reservoir (Johnson 1987). Sampling 

during the 1990s indicated that the rainbow trout is continuing to increase in occurrence 

in most systems. At some of the upper site locations on the Animas River and tributaries 

upstream of Navajo Reservoir this species has become one of the most abundant fish in 

collections. The rainbow trout was represented by two size classes, juvenile and adult, in 

the compiled 1994 habitat use data. Most of the few specimens collected in the juvenile 

size class were found occupying glide habitat. Although adults were encountered in all 

three major habitat types, most were collected from pool habitat. 

Oncorhynchus nerka (kokanee salmon): This non-native species was only reported from 

three sampling events during the historical fish sampling of tributaries to the San Juan 

River. Each report of kokanee salmon came from a tributary upstream of Navajo 

Reservoir during the early 1990s. It is likely that reports of this species were the result of 

spawning migrations from fish that had been stocked into Navajo Reservoir. Kokanee 

salmon were not encountered during the MEC habitat use study. 

Salvelinus fontinalis (brook trout): This non-native species has been stocked in the 

Animas system and the La Plata River on several occasions since the early 1960s (Smith 

1976). The brook trout was first reported from fish surveys within the study area during 

1972. During this time the brook trout appeared in several collections from the Navajo 
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Miller Ecological Consultants, Inc. Page 23 

River. Since 1972 this species has been collected (infrequently) from the La Plata River 

and Mancos River. This species is usually restricted to the cooler temperatures at the 

upper reaches of streams. The brook trout was represented during the 1994 habitat use 

study by only two individuals. One juvenile individual was captured in riffle habitat, and 

an adult was captured in pool habitat. 

Salmo trutta (brown trout): Earliest reports of brown trout in tributaries of the San Juan 

River came from collections made in the Animas River during 1954. The brown trout 

was introduced to the La Plata River during 1958 and has maintained small populations 

there since that time (Smith 1976). This non-native species was apparently established in 

all major tributaries upstream of Navajo Reservoir prior to collections made during the 

1970s. By the 1990s the brown trout was also common in collections from the Florida 

River and La Plata River. Brown trout were not reported during historical sampling 

efforts on the Mancos River or Mc Elmo Creek. 

Brown trout were represented in the compiled habitat use data by all three age classes. 

Only two YOY brown trout were encountered and both were collected from riffle habitat. 

Juvenile and adult brown trout were mostly encountered in pool habitat, although they 

were well represented in each available habitat type. 

Cyprinella lutrensis (red shiner): The first reported collection of this non-native species 

in the San Juan drainage came from sampling which occurred in the Animas River during 

1954. The red shiner was collected from the Mancos River and Navajo Wash during 

1975, and was reported from the La Plata River during 1976. The earliest collections 

from Mc Elmo Creek occurred during 1978. Representative of this species have been 

reported in the Mancos River and Mc Elmo Creek during every decade since they were 

initially discovered. At some of the lower sites on the Mancos River this species was one 

of the most abundant of the species collected during the 1994 habitat study. Most red 

shiners and were found in glide habitat. 

Cyprinus carpio (common carp): The common carp was apparently established by 1961 

in the area now inundated by Navajo Reservoir (Olson 1962a). The earliest fish surveys 

to report this non-native species in tributaries of the San Juan River occurred during the 

1970s. During this time the common carp was reported from three major tributaries: the 

Animas River, Mancos River (and Navajo Wash), and Mc Elmo Creek. It has since been 

collected from other tributaries upstream and downstream of Navajo Reservoir. These 

tributaries include: the Navajo River, Piedra River, and Florida River. Since the 1970s 

small populations of common carp have apparently become established at some locations 

(most of these areas occurring on the Animas River). Sampling at these locations has 

revealed that this species constitutes a relatively small numeric portion of the total 

species composition. Low numbers of large individuals were typical in collections where 

this species had become established. Common carp were only represented by a few 

individuals in the juvenile and adults size class during the 1994 habitat study. Regardless 

of size, common carp were only collected from glide habitat. 
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Notemigonus crysoleucas (golden shiner): The golden shiner was only encountered on 

two occasions during the historical sampling of these San Juan River tributaries. Both 

collections of this non-native species occurred in tributaries upstream of Navajo 

reservoir. Three individuals were collected from the Navajo River during 1972, and two 

individuals were reported from the Los Pinos River during 1992. The golden shiner was 

not encountered during the habitat use study. 

Pimephales promelas (fathead minnow): Earliest reports of this non-native species in the 

study area of the San Juan drainage came from the Animas River during 1954. By the 

late 1970s this species had been reported from the Navajo River, and appeared to be well 

established in the La Plata River, Mancos River, Navajo Wash and Mc Elmo Creek. By 

1992 the fathead minnow had been reported from all major tributaries of the San Juan 

River. After becoming established, the fathead minnow became a dominant fish species 

in at many locations. Streams with large populations of fathead minnows include the La 

Plata River, the lower Mancos River and Mc Elmo Creek. Due to the small adult size of 

this species it is often overlooked by the sampling techniques used in large rivers. It is 

likely that sizable populations of fathead minnows also exist in some systems that are 

difficult to sample. Fathead minnows were represented in the MEC habitat use data by 

adult and juvenile size classes. Representatives of both size classes were found 

inhabiting all three major habitat types. Juveniles were found primarily in glide habitat, 

while adult fathead minnows were collected mostly from pool habitat. 

Catostomus commersoni (white sucker): Historical fish sampling in the San Juan 

drainage suggests that this non-native species has become established in several major 

tributaries. The first report of this species in the study area came from the Animas River 

during 1961. It was also reported with some frequency in early collections from 

tributaries upstream of Navajo Reservoir. Olson (1962b) indicated that this species had 

become established in the area now inundated by Navajo Reservoir. It is likely that the 

white sucker had become established in certain areas upstream of Navajo Reservoir prior 

to collections made during the early 1970s. The earliest reports of this species occurring 

in the Florida River came from collections made during 1983. By the early 1990s 

sampling efforts indicated that this species had become more common in the Florida 

River than in the Animas River. Sampling efforts at other locations during the 1990s 

indicated that the white sucker had become established (even dominant at some locations) 

in tributaries upstream of Navajo reservoir, however this species had still not been 

reported from most of the lower tributaries. As of 1998 the white sucker had not been 

reported from the La Plata River, Mancos River or McElmo Creek. 

During the habitat use study the white sucker was represented in collections by all three 

size classes, however most were juveniles. Only one individual in the “young of the 

year” (YOY) size class was collected during this study. This fish was captured while 

occupying riffle habitat. Juvenile white suckers were captured from each habitat type. 

The data suggests that most juvenile white suckers reside in glide habitat. Adults were 

found in glide habitat and pool habitat. No white sucker adults were encountered in riffle 

habitat. 
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Miller Ecological Consultants, Inc. Page 25 

Ameiurus melas (black bullhead): Early records of this species in the study area include 

several sampling events which occurred during the summer of 1976 on the Animas River. 

These were the only reports of black bullheads until the 1990s. Since 1992 small 

numbers of black bullheads have been reported from several major tributaries of the San 

Juan River. The tributaries from which black bullheads have been reported include; the 

Los Pinos River, Navajo River, Florida River and La Plata River. This non-native 

species was represented by a few juvenile and adult individuals throughout the 1994 

habitat study. Collections of black bullheads occurred in glide and pool habitat. 

Ictalurus punctatus (channel catfish): The earliest reports of channel catfish in tributaries 

of the San Juan River came from sampling efforts on the Mancos River in 1975; 

however, Olson (1962b) reported this species during a pre-impoundment study of the 

Navajo Reservoir area. By 1992 this non-native species had also been reported from two 

major tributaries (the Los Pinos and Piedra rivers) upstream of Navajo Reservoir. During 

the 1994 habitat study this species was represented in the data by only two records. On 

both occasions an adult fish was captured in the Mancos River while occupying pool 

habitat. 

Fundulus zebrinus (plains killifish): During 1976 this non-native species was collected 

from the Animas River and La Plata River. These were the only reported collections of 

plains killifish in the study area. It was not collected during the MEC habitat use study. 

Gambusia affinis (mosquito fish): Earliest reports of this species in the upper San Juan 

drainage came from the Animas River during 1961. Since that time it has only been 

reported from two other sampling events. Both of these occurred on the Animas River 

during the 1989. These are the only historical records of this non-native species in the 

San Juan drainage. The mosquito fish was not encountered during the habitat use study. 

Lepomis cyanellus (green sunfish): This non-native species appeared in low numbers 

over a widespread area of the San Juan drainage during the early 1990s. It was collected 

in the Florida River during 1991, and the Los Pinos and Animas rivers during 1993. 

During 1994 it was also reported from the Navajo River, and Mc Elmo Creek. Only the 

juvenile size class of green sunfish was represented in the 1994 habitat use study. These 

fish were encountered in all three major habitat types. 

Micropterus dolomieu (smallmouth bass): The smallmouth bass was only represented by 

one individual during historical sampling events in the San Juan drainage. This single 

specimen was collected from the San Juan River upstream of Navajo Reservoir during 

1992. The smallmouth bass was not reported during the 1994 habitat use study. 
Draft Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Page 26 

CONCLUSIONS 

The following are general conclusions that are supported by fish surveys on tributaries of 

the San Juan River: 

• Most fish surveys have occurred since 1970. 

• In most reaches of San Juan River tributaries native fish are still the dominant 

species. 

• Populations of roundail chub in the Animas River may have substantially declined 

following the introduction of non-native fish species. 

• Self-sustaining populations of non-native fish species currently exist in all major 

tributaries of the San Juan River. 

• The white sucker is established in the Animas River, but has not yet been reported 

from the La Plata River. 

Historical studies of fish in tributaries of the San Juan River provide an account of native 

and non-native species composition during a period of non-native introduction. The 

Animas River has been the site of more historical fish surveys and earlier sampling 

events than other tributaries. The earliest recorded sampling events (and other 

unconfirmed early reports) in the Animas River included only records of native fish 

species. By the 1950s, non-native fish had been detected in a reach of the Animas River 

upstream of the Colorado border. Non-native species have persisted in the Animas River 

since they were first reported; however, the composition and number of species have 

changed. 

Because there are few records of fish surveys in other tributaries prior to 1970, it is likely 

that some non-native fish were already established in various tributaries before they were 

reported. However, one of the earliest surveys from the La Plata River (1966) only 

provided evidence of the existence of native fish. Although some non-native species had 

been stocked in the La Plata River prior to this time, most non-native species were 

probably not established over a widespread area. 

The expansion of non-native fish in tributaries of the upper San Juan River has been 

concurrent with a decline in certain native fish species. There have been several 

historical reports that suggest that native fish may have been relatively abundant in areas 

where recent surveys indicated they were rare or nonexistent (Jordan 1891, Koster 1957, 

Dean 1961, Olson 1962a). Several researchers have also commented on the decline of 

certain native species (Sublette 1977, Platania and Bestgen 1988, Platania and Young 

1990). In fact, the data presented here suggests that roundtail chubs may have been 

common in some reaches of the Animas River. A review of historical fish surveys 

suggests that the establishment of species (and species composition) is a dynamic 

process. Future surveys will be necessary answer more questions regarding the balance 

of native and non-native fish fauna in tributaries of the upper San Juan River. 
Draft Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Page 27 

LITERATURE CITED 

Anderson, C., D. Langlois, and M. Japhet. 1993. A summary of recent fish surveys of the 

tributaries of the San Juan River in Colorado. Colorado Division of Wildlife, 2300 S. 

Townsend Ave., Montrose, Colorado. 98pp. 

Dean, N.K. 1961. Fishes taken on the Navajo Expedition, 1960. pp. 119-122 in 

Woodbury, A.M., et al. 1961. Ecological studies of the flora and fauna of Navajo 

Reservoir basin, Colorado and New Mexico. University of Utah Anthropological 

Papers 55:203 pp. 

Graves, E. and B. Haines. 1968. Fishery surveys of Navajo Reservoir and tailwaters. 

Section 8 project, Job No. A-5(a) and A-5(b). New Mexico Department of Game and 

Fish, Santa Fe, New Mexico. 48 pp. 

Graves, E. and B. Haines. 1969. Fishery surveys of Navajo Reservoir and tailwaters. 

Section 8 project, Job No. A-6(a) and A-6(b). New Mexico Department of Game and 

Fish, Santa Fe, New Mexico. 103 pp. 

Jensen, B.L. 1975. Dolores Project Investigations: Ute Mountain Ute Indian Reservation, 

Colorado and New Mexico. U.S. Fish and Wildlife Service, Division of Fishery 

Services, Gallup, New Mexico. 12pp. 

Johnson, D.B. 1987. Navajo River and Seguro Canyon Fisheries Surveys, Jicarilla 

Apache Reservation. Bureau of Indian Affairs. Albuquerque, New Mexico. 

Jordan, D.S. 1891. Report of explorations in Colorado and Utah during the summer of 

1889, with an account of the fishes found in each of the river basins examined. Bulletin 

of the U.S. Fish Commission 9:1-40. 

Koster, W.J. 1957. Guide to the fishes of New Mexico. University of New Mexico Press, 

Albuquerque, New Mexico. 116 pp. 

Miller, W.J. 1995. Final Report, Animas-La Plata Project Native Fish Studies. Miller 

Ecological Consultants, Inc., Fort Collins, Colorado. 

Olson, H.F. 1962a. Rehabilitation of the San Juan River. Federal Aid Project F-19-D-4, 

Job No. C-16-4. New Mexico Department of Game and Fish, Santa Fe, New Mexico. 

Olson, H.F. 1962b. A pre-impoundment study of Navajo Reservoir, New Mexico. 

Federal Aid Project F-22-R-3, Work Plan 1, Job B-1. New Mexico Department of 

Game and Fish, Santa Fe, New Mexico. 

Olson, H.F. 1963. Fisheries study of Navajo Reservoir. Section 8 project, Job No. B-1. 

New Mexico Department of Game and Fish, Santa Fe, New Mexico. 
Draft Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Page 28 

Olson, H.F. 1967. A post-impoundment study of Navajo Reservoir and Navajo Reservoir 

tailwaters. Section 8 project, Job No. A-3(a) and A-3(b). New Mexico Department of 

Game and Fish, Santa Fe, New Mexico. 

Olson, H.F. 1968. Fisheries survey of Navajo Reservoir and tailwaters. Section 8 project, 

Job No. A-4(a) and A-4(b). New Mexico Department of Game and Fish, Santa Fe, 

New Mexico. 

Platania, S.P. 1990. Biological summary of the 1987 to 1989 New Mexico-Utah 

ichthyofaunal study of the San Juan River. Prepared for the U.S. Bureau of 

Reclamation, Salt Lake City, Utah. Cooperative Agreement 7-FC-40-05060. 

Platania, S.P. and K.R. Bestgen. 1988b. Study of the rare and endangered fishes of the 

San Juan River, New Mexico. Report to New Mexico Department of Game and Fish, 

Santa Fe, New Mexico. 47 pp. 

Platania, S.P. and D.A. Young. 1990. A survey of the ichthyofauna of the San Juan and 

Animas rivers from Archuleta and Cedar Hill, (respectively), to their confluence at 

Farmington, New Mexico. Report prepared for Trigon Engineering, Inc., Durango, 

Colorado. 55 pp. 

Robertson, B.A. 1977. Aquatic inventory: Mancos River System; Animas-La Plata 

Project. U.S. Fish and Wildlife Service, Inland Fisheries and Reservoir, Gallup, New 

Mexico. 

Smith, N.F. 1976. Aquatic inventory: Animas-La Plata Project. Colorado Division of 

Wildlife, Denver, Colorado. 316 pp. 

Sublette, J.E. 1977. A survey of the fishes of the San Juan River basin, with particular 

reference to the endangered species. Prepared for the U.S. Fish and Wildlife Service, 

Albuquerque, New Mexico. 95 pp. 
SJR Final Tributary Report January 31, 2000 

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APPENDIX A 
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Table A-1. Abundance of fishes collected from sampling sites on tributaries downstream from Navajo Reservoir (1934-1989). 

Species 

 Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFON CYPLUT CYPCAR PIMPRO CATCOM SUCKER 

Animas 1 06/04/34 Aztec 7 163 1 75 Animas 1 06/12/40 3 mi. N.E. of Farmington 3 2 Animas 1 07/06/61 4 mi. north of Cedar Hill 13 2 16 2 2 Animas 1 11/15/63 1 mile north of Cedar Hill 15 Animas 1 10/20/74 At the stateline 1 4 Animas 1 05/03/76 3 mi N – 4.5 mi South of Cedar Hill 328 630 24 4 1 1 21 Animas 1 05/04/76 Aztec to Farmington 277 539 117 1 31 Animas 1 08/11/76 3 mi N – 4.5 mi South of Cedar Hill 78 238 111 28 1 10 Animas 1 08/13/76 Aztec to Farmington 172 124 131 3 3 49 Animas 1 10/02/77 Aztec 53 56 92 10 Animas 1 09/22/80 Below Florida River Confluence 38 52 1 1 Animas 1 11/17/82 Bondad brdg to Cogburn -2.25 mi. 1 2 47 66 6 6 5 4 Animas 1 10/03/89 South Miller Ave. Bridge 9 8 73 1 9 Animas 1 10/03/89 Flora Vista 1 5 5 2 Animas 1 10/03/89 Aztec 48 76 152 11 79 Animas 1 10/03/89 3 miles north of Aztec 27 88 216 2 68 Animas 1 10/03/89 Cedar Hill 38 111 225 19 9 Animas 2 07/15/54 4.5 mi. South of Durango N N 2 1 P 4 Animas 2 07/15/54 6.7 mi. South of Durango N 2 P 2 Animas 2 12/10/75 Purple Cliffs 4 Animas 2 12/10/75 Weaselskin bridge (sunnyside) 1 15 15 12 9 Animas 2 12/10/75 Above Bondad - 2 miles 3 37 15 15 1 Animas 2 10/31/78 Purple Cliffs 40 4 Animas 2 10/31/78 Weaselskin bridge (sunnyside) 10 6 209 1 14 8 Animas 2 10/31/78 Above Bondad - 2 miles 5 Animas 2 09/08/80 Weaselskin bridge (sunnyside) 1 20 3 1 N Animas 2 09/08/80 Above Bondad - 2 miles 8 3 2 1 N Animas 2 09/16/80 Purple Cliffs area 1 201 50 6 2 1 31 9 4 2 Animas 2 09/22/80 Below Bondad Bridge 54 70 1 4 2 Animas 2 09/30/80 Purple Cliffs 2 89 5 3 12 Animas 2 09/30/80 Above Bondad - 2 miles 4 3 94 Animas 2 01/26/82 Pueblo Paving-Purple Cliffs - 2.4 mi. 77 33 233 Animas 2 12/14/82 Pueblo Paving-Purple Cliffs - 2.4 mi. 9 10 198 P Animas 2 12/15/83 Handlebar cycle-PurpleCliffs-2.4 mi 4 21 207 1 P Animas 2 02/25/85 Handlebar cycle-PurpleCliffs-2.4 mi P P 22 152 1 P Animas 2 12/01/87 Handlebar cycle-PurpleCliffs-2.4 mi 91 157 P Animas 2 10/17/88 Handlebar cycle-PurpleCliffs-2.4 mi 105 163 P Animas 2 11/15/89 Handlebar cycle-PurpleCliffs-2.4 mi 54 115 P 
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Table A-1 (continued). Abundance of fishes collected from sampling sites on tributaries downstream from Navajo Reservoir (1934-1989). 

Species 

 Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFON CYPLUT CYPCAR PIMPRO CATCOM SUCKER 

Cherry Creek 1 11/12/75 2 32 7 Florida 1 12/11/75 HWY 160 Bridge 69 1 19 3 40 Florida 1 07/29/83 About 1 mi. abv Animas River 1 10 1 Florida 1 11/08/83 About 1 mi. abv Animas River 1 2 Florida 1 09/17/84 About 2.5 mi. abv Animas River 18 3 9 Florida 1 07/27/87 0.6 mi. above Animas R. Confl. 7 1 4 2 La Plata 1 07/25/66 4 mi. North of La Plata 11 9 17 La Plata 1 05/03/76 3 miles north of La Plata 53 15 14 1 La Plata 1 05/03/76 1/4 mile east of La Plata 376 69 10 60 La Plata 1 05/03/76 2.6 miles south of La Plata 6 2 10 La Plata 1 05/03/76 7 miles south of La Plata 195 10 3 44 La Plata 1 05/06/76 4 miles west of Farmington 135 104 60 1 18 La Plata 1 05/07/76 10.5 miles south of La Plata 8 1 307 La Plata 1 05/07/76 2 mi W-2 mi N of Farmington 21 2 17 21 La Plata 1 08/15/76 3 miles north of La Plata 55 La Plata 1 08/15/76 3 miles north of La Plata 1 13 156 117 La Plata 1 08/15/76 2.5 miles south of La Plata 2 4 La Plata 1 08/16/76 4 miles north of Farmington 41 21 La Plata 1 08/16/76 2 mi W-2 mi N of Farmington 2 2 9 La Plata 1 08/17/76 1/2 mile east of La Plata 25 4 110 La Plata 1 08/17/76 1/4 mile east of La Plata 16 La Plata 1 08/17/76 4.5 miles south of La Plata 8 1 2 72 La Plata 1 08/17/76 8 miles south of La Plata 5 La Plata 1 08/17/76 10 miles south of La Plata La Plata 1 08/17/76 5 miles north of Farmington 4 1 21 60 La Plata 2 07/30/75 Bridge - 1/4 mi. N. of Stateline 207 63 46 La Plata 3 03/15/88 0.5 mi above Long Hollow Crk Confl. 20 33 4 3 La Plata 4 07/30/75 Just below HWY 160 43 3 2 5 La Plata 4 07/30/75 County Road 122 19 1 2 2 La Plata 4 05/11/88 CSU Experiment Station ? 1 1 1 Long Hollow 1 07/30/75 Road 122 61 52 Long Hollow 1 07/30/75 Road 121 (131 ?) 36 23 Mancos 1 07/28/75 0.5 mi. NE stateline 2 1 4 1 Mancos 1 11/11/75 0.5 mi. NE stateline 2 2 2 Mancos 1 08/13/87 1.5 mi. NE stateline 1 5 2 Mancos 1 07/12/89 1.5 mi. above San Juan River P P P P P P Mancos 2 07/29/75 HWY 666 Bridge - upstream 2 32 5 72 2 Mancos 2 07/29/75 Johnson Canyon Confluence 12 2 11 
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Table A-1 (continued). Abundance of fishes collected from sampling sites on tributaries downstream from Navajo Reservoir (1934-1989). 

Species 

 Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFON CYPLUT CYPCAR PIMPRO CATCOM SUCKER 

Mancos 2 11/11/75 HWY 666 Bridge - upstream 3 1 3 Mancos 2 11/11/75 Johnson Canyon Confluence 1 Mancos 2 08/13/87 HWY 666 Bridge - upstream 2 13 1 3 1 1 Mancos 2 08/13/87 Johnson Canyon Confluence 6 11 12 10 Mancos 2 07/11/89 Navajo Canyon Confluence P P P Mancos 3 07/29/75 Mancos Jr. High Bridge 68 25 1 255 3 Mancos 3 07/29/75 2 mi. S. of HWY 160 113 185 32 Mancos 3 11/12/75 Mancos Jr. High Bridge 89 14 112 4 Mancos 3 10/08/84 Near Mancos 29 5 2 Mancos 3 07/11/89 1 mi. S. of Jackson Reservoir P P P Mancos 3 07/11/89 H Road Bridge P P P P P Mc Elmo 1 08/30/77 Colorado - Utah stateline 2 1 Mc Elmo 1 11/02/77 Colorado - Utah stateline 19 1 1 Mc Elmo 1 11/02/77 8.5 mi. above Colorado - Utah stateline 4 7 46 Mc Elmo 1 11/02/77 Goodman Canyon Confluence 12 Mc Elmo 1 11/02/77 South Oak St. in Cortez NO FISH Mc Elmo 1 10/09/78 8.5 mi. above Colorado - Utah stateline 1 17 Mc Elmo 1 10/09/78 Goodman Canyon Confluence NO FISH Mc Elmo 1 10/09/78 Colorado - Utah stateline 2 9 6 4 27 Mc Elmo 1 09/12/79 1/4 mi. above San Juan R. confluence 11 2 11 16 4 Mc Elmo 1 09/12/79 4.8 mi. above San Juan R. confluence 4 1 4 9 8 2 Mc Elmo 1 07/01/80 At San Juan River confluence 20 10 42 56 6 33 Mc Elmo 1 07/01/80 3 mi. above San Juan R. confluence 9 2 16 6 1 2 Mc Elmo 1 09/24/84 Near Ismay Trading Post 4 9 16 2 22 Mc Elmo 1 08/12/87 Colorado - Utah stateline 2 3 36 4 3 2 Mc Elmo 1 08/12/87 8.5 mi. above Colorado - Utah stateline 1 20 Mc Elmo 1 08/12/87 Goodman Canyon Confluence 8 Mc Elmo 1 08/12/87 South Oak St. in Cortez 13 4 5 Navajo Wash 1 07/28/75 2.5 mi. south of Towoac, CO 15 73 44 32 1 Navajo Wash 1 07/28/75 HWY 160 4 10 5 2 1 7 Navajo Wash 1 11/11/75 2.5 mi. south of Towoac, CO 17 27 32 36 2 Navajo Wash 1 11/11/75 HWY 160 3 1 10 2 Navajo Wash 1 08/10/87 2.5 mi. south of Towoac, CO 14 35 10 1 Navajo Wash 1 08/10/87 HWY 160 7 21 5 N = numerous. P = present. 
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Table A-2. Site location descriptions for sites downstream of Navajo Reservoir (1934-1989). 

River County Date Site Sample # Method Time Area Township 

Animas San Juan, NM 06/04/1934 Aztec I. Rodehoff 30N 11W Animas San Juan, NM 06/12/1940 3 mi. N.E. of Farmington C. Jackson 29N 13W Animas La Plata, CO 07/15/1954 4.5 mi. South of Durango EL 34N 9W Animas La Plata, CO 07/15/1954 6.7 mi. South of Durango EL 34N 9W Animas San Juan, NM 07/06/1961 4 mi. north of Cedar Hill H. Olson 32N 10W Animas San Juan, NM 11/15/1963 1 mile north of Cedar Hill H. Olson 32N 10W Animas San Juan, NM 10/20/1974 At the stateline S. Patterson 32N 10W Animas La Plata, CO 12/10/1975 Above Bondad - 2 miles CDOW 1 EL 33N 9W Animas La Plata, CO 12/10/1975 Purple Cliffs CDOW 3 EL 34N 9W Animas La Plata, CO 12/10/1975 Weaselskin bridge (sunnyside) CDOW 2 EL 34N 10W Animas San Juan, NM 05/03/1976 2.5 miles south of Cedar Hill J. Hayhurst 31N 10W Animas San Juan, NM 05/03/1976 3 miles north of Cedar Hill J. Hayhurst 32N 10W Animas San Juan, NM 05/03/1976 7 mi E - 10.5 mi N of Aztec J. Hayhurst 32N 10W Animas San Juan, NM 05/03/1976 Cedar Hill - US 550 Bridge J. Hayhurst 31N 10W Animas San Juan, NM 05/04/1976 Farmington J. Hayhurst 29N 13W Animas San Juan, NM 05/04/1976 Farmington J. Hayhurst 29N 13W Animas San Juan, NM 05/05/1976 Aztec - US 550 Bridge J. Hayhurst 30N 11W Animas San Juan, NM 05/05/1976 Flora Vista J. Hayhurst 30N 12W Animas San Juan, NM 08/11/1976 2 miles southwest of Cedar Hill G. Ayoroa 31N 10W Animas San Juan, NM 08/11/1976 3 miles north of Cedar Hill G. Ayoroa 32N 10W Animas San Juan, NM 08/11/1976 4.5 miles south of Cedar Hill G. Ayoroa 31N 10W Animas San Juan, NM 08/13/1976 1 mi. South of Flora Vista G. Ayoroa 30N 12W Animas San Juan, NM 08/13/1976 Aztec G. Ayoroa 30N 11W Animas San Juan, NM 08/14/1976 Farmington G. Ayoroa 29N 13W Animas San Juan, NM 08/14/1976 Farmington G. Ayoroa 29N 13W Animas San Juan, NM 08/14/1976 Farmington G. Ayoroa 29N 13W Animas San Juan, NM 10/02/1977 Aztec E. Suttkus 30N 11W Animas La Plata, CO 10/31/1978 Above Bondad - 2 miles CDOW 1 EL 33N 9W Animas La Plata, CO 10/31/1978 Purple Cliffs CDOW 3 EL 34N 9W Animas La Plata, CO 10/31/1978 Weaselskin bridge (sunnyside) CDOW 2 EL 34N 10W Animas La Plata, CO 09/08/1980 Above Bondad - 2 miles CDOW 1 BOAT EL 33N 9W Animas La Plata, CO 09/08/1980 Weaselskin bridge (sunnyside) CDOW 2 BOAT EL 34N 10W Animas La Plata, CO 09/16/1980 Purple Cliffs area BREC 1 B BOAT EL 34N 9W Animas La Plata, CO 09/22/1980 Below Bondad Bridge BREC 3 B BOAT EL 32N 9W Animas La Plata, CO 09/22/1980 Below Florida River Confluence BREC 3 B BOAT EL 32N 9W Animas La Plata, CO 09/30/1980 Above Bondad - 2 miles CDOW 1 33N 9W Animas La Plata, CO 09/30/1980 Purple Cliffs CDOW 3 34N 9W Animas La Plata, CO 01/26/1982 Pueblo Paving to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 11/17/1982 Bondad bridge to Cogburn prop. -2.25 mi. CDOW 1 B BOAT EL 32N 9W Animas La Plata, CO 12/14/1982 Pueblo Paving to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 12/15/1983 Handlebar cycle to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 02/25/1985 Handlebar cycle to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 12/01/1987 Handlebar cycle to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 10/17/1988 Handlebar cycle to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas San Juan, NM 10/03/1989 South Miller Ave. Bridge S. Platania Animas San Juan, NM 10/03/1989 Flora Vista S. Platania 
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Table A-2 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1934-1989). 

River County Date Site Sample # Method Time Area Township 

Animas San Juan, NM 10/03/1989 Aztec S. Platania Animas San Juan, NM 10/03/1989 3 Miles north of Aztec S. Platania Animas San Juan, NM 10/03/1989 Cedar Hill S. Platania Animas La Plata, CO 11/15/1989 Handlebar cycle to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W 

Cherry Crk. La Plata, CO 11/12/1975 EL 34N 12W 

Florida La Plata, CO 12/11/1975 HWY 160 Bridge CDOW 1 EL 34N 8W Florida La Plata, CO 07/19/1982 20.7 mi. abv Animas R. -Lunt Ranch FLC 2 34N 8W Florida La Plata, CO 07/29/1983 About 1 mi. abv Animas River BIOWEST - 1 33N 9W Florida La Plata, CO 11/08/1983 About 1 mi. abv Animas River 33N 9W Florida La Plata, CO 09/17/1984 About 2.5 mi. abv Animas River 33N 9W Florida La Plata, CO 07/27/1987 0.6 mi. above Animas R. Confl. FLC 1 33N 9W 

La Plata San Juan, NM 07/25/1966 4 mi. North of La Plata S. Koehn 32N 13W La Plata La Plata, CO 07/30/1975 Bridge - 1/4 mi. N. of Stateline CDOW #1 EL 32N 13W La Plata La Plata, CO 07/30/1975 County Road 122 CDOW #2 EL 34N 12W La Plata La Plata, CO 07/30/1975 Just below HWY 160 CDOW #3 EL 35N 11W La Plata San Juan, NM 05/03/1976 1/4 mile east of La Plata J. Hayhurst 31N 13W La Plata San Juan, NM 05/03/1976 2.6 miles south of La Plata J. Hayhurst 31N 13W La Plata San Juan, NM 05/03/1976 3 miles north of La Plata J. Hayhurst 32N 13W La Plata San Juan, NM 05/03/1976 7 miles south of La Plata J. Hayhurst 31N 13W La Plata San Juan, NM 05/06/1976 4 miles west of Farmington J. Hayhurst 29N 13W La Plata San Juan, NM 05/07/1976 10.5 miles south of La Plata J. Hayhurst 30N 13W La Plata San Juan, NM 05/07/1976 2 miles west-2 miles north of Farmington J. Hayhurst 29N 13W La Plata San Juan, NM 08/15/1976 2.5 miles south of La Plata G. Ayoroa 31N 13W La Plata San Juan, NM 08/15/1976 3 miles north of La Plata G. Ayoroa 32N 13W La Plata San Juan, NM 08/15/1976 3 miles north of La Plata G. Ayoroa SE 32N 13W La Plata San Juan, NM 08/16/1976 2 mi. north - 2 mi. west of Farmington G. Ayoroa 29N 13W La Plata San Juan, NM 08/16/1976 4 miles north of Farmington G. Ayoroa 30N 13W La Plata San Juan, NM 08/17/1976 1/2 mile east of La Plata G. Ayoroa 31N 13W La Plata San Juan, NM 08/17/1976 1/4 mile east of La Plata G. Ayoroa 31N 13W La Plata San Juan, NM 08/17/1976 10 miles south of La Plata G. Ayoroa 30N 13W La Plata San Juan, NM 08/17/1976 4.5 miles south of La Plata G. Ayoroa 31N 13W La Plata San Juan, NM 08/17/1976 5 miles north of Farmington G. Ayoroa 30N 13W La Plata San Juan, NM 08/17/1976 8 miles south of La Plata G. Ayoroa 30N 13W La Plata La Plata, CO 03/15/1988 0.5 mi. above Long Hollow Crk Confl. CDOW #1A EL 33N 12W La Plata La Plata, CO 05/11/1988 CSU Experiment Station ? 

Long Hollow La Plata, CO 07/30/1975 Road 122 EL 33N 12W Long Hollow La Plata, CO 07/30/1975 Road 121 (131 ?) EL 

Mancos Montezuma, CO 07/28/1975 0.5 mi. NE stateline CDOW 1 EL 32N 19W Mancos Montezuma, CO 07/29/1975 HWY 666 Bridge - upstream CDOW 1 EL 32N 17W Mancos Montezuma, CO 07/29/1975 2 mi. S. of HWY 160 CDOW 1 EL 35N 14W Mancos Montezuma, CO 07/29/1975 Johnson Canyon Confluence CDOW 2 EL 33N 15W Mancos Montezuma, CO 07/29/1975 Mancos Jr. High Bridge CDOW 2 EL 36N 13W Mancos Montezuma, CO 11/11/1975 HWY 666 Bridge - upstream CDOW 1 EL 32N 17W Mancos Montezuma, CO 11/11/1975 0.5 mi. NE stateline CDOW 1 EL 32N 19W Mancos Montezuma, CO 11/11/1975 Johnson Canyon Confluence CDOW 2 EL 33N 15W Mancos Montezuma, CO 11/12/1975 Mancos Jr. High Bridge CDOW 2 EL 36N 13W 
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Table A-2 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1934-1989). 

River County Date Site Sample # Method Time Area Township 

Mancos Montezuma, CO 10/08/1984 Near Mancos 36N 13W Mancos Montezuma, CO 08/13/1987 HWY 666 Bridge - upstream CDOW 1 EL 32N 17W Mancos Montezuma, CO 08/13/1987 1.5 mi. NE stateline CDOW 1 EL 32N 19W Mancos Montezuma, CO 08/13/1987 Johnson Canyon Confluence CDOW 2 EL 33N 15W Mancos Montezuma, CO 07/11/1989 1 mi. S. of Jackson Reservoir USFWS EL Mancos Montezuma, CO 07/11/1989 H Road Bridge USFWS EL 35N 13W Mancos Montezuma, CO 07/11/1989 Navajo Canyon Confluence USFWS EL 33N 15W Mancos San Juan, NM 07/12/1989 1.5 mi. above San Juan River USFWS EL 32N 20W 

McElmo Montezuma, CO 08/30/1977 Colorado - Utah stateline CDOW 1 EL 35N 20W McElmo Montezuma, CO 11/02/1977 Colorado - Utah stateline CDOW 1 EL 35N 20W McElmo Montezuma, CO 11/02/1977 8.5 mi. above Colorado - Utah stateline CDOW 2 EL 35N 19W McElmo Montezuma, CO 11/02/1977 Goodman Canyon Confluence CDOW 3 EL 36N 17W McElmo Montezuma, CO 11/02/1977 South Oak St. in Cortez CDOW 4 EL 35N 16W McElmo Montezuma, CO 10/09/1978 8.5 mi. above Colorado - Utah stateline CDOW 2 EL 35N 19W McElmo Montezuma, CO 10/09/1978 Goodman Canyon Confluence CDOW 3 EL 36N 17W McElmo Montezuma, CO 10/09/1978 Colorado - Utah stateline CDOW 1 EL 35N 20W McElmo Montezuma, CO 09/12/1979 1/4 mi. above San Juan R. confluence UTAH EL 41S 25E McElmo Montezuma, CO 09/12/1979 4.8 mi. above San Juan R. confluence UTAH EL 41S 25E McElmo Montezuma, CO 07/01/1980 At San Juan River confluence UTAH EL 41S 25E McElmo Montezuma, CO 07/01/1980 3 mi. above San Juan R. confluence UTAH EL 41S 25E McElmo Montezuma, CO 09/24/1984 Near Ismay Trading Post Fort Lewis College EL 35N 20W McElmo Montezuma, CO 08/12/1987 Colorado - Utah stateline CDOW 1 EL 35N 20W McElmo Montezuma, CO 08/12/1987 8.5 mi. above Colorado - Utah stateline CDOW 2 EL 35N 19W McElmo Montezuma, CO 08/12/1987 Goodman Canyon Confluence CDOW 3 EL 36N 17W McElmo Montezuma, CO 08/12/1987 South Oak St. in Cortez CDOW 4 EL 35N 16W 

Navajo Wash Montezuma, CO 07/28/1975 HWY 160 CDOW EL 33N 18W Navajo Wash Montezuma, CO 07/28/1975 2.5 mi. south of Towaoc, CO CDOW EL 331/2 N 17W Navajo Wash Montezuma, CO 11/11/1975 HWY 160 CDOW EL 33N 18W Navajo Wash Montezuma, CO 11/11/1975 2.5 mi. south of Towaoc, CO CDOW EL 331/2 N 17W Navajo Wash Montezuma, CO 08/10/1987 HWY 160 EL 33N 18W Navajo Wash Montezuma, CO 08/10/1987 2.5 mi. south of Towaoc, CO EL 331/2 N 17W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 

8

Table A-3. Abundance of fishes collected from sampling sites on tributaries upstream of Navajo Reservoir.

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK ONCNER SALFON SALTRU CYPCAR NOTCRY PIMPRO CATCOM SUCK

Los Pinos 11/13/73 La Boca bridge 3 3 1 1 Los Pinos 11/13/73 Severo Canal 2 3 Los Pinos 11/13/73 Ignacio bridge 2 21 2 6 5 Los Pinos 11/13/73 8 9 1 Los Pinos 12/11/75 Hwy 160 bridge 1 73 46 13 2 Los Pinos 12/11/75 6 miles South of Ignacio 2 3 1 2 Los Pinos 12/11/75 3 miles South of Ignacio 1 2 Los Pinos 12/11/75 1/4 mi. above Agency Bridge 1 3 Los Pinos 03/19/92 Little braid' - below Hwy 160 28 36 1 61 18 Los Pinos 07/14/92 Rodeo 20 7 1 8 1 7 Los Pinos 07/14/92 Rock Creek 193 10 5 2 20 12 Los Pinos 07/14/92 Railway Trestle 140 4 2 2 5 24 1 Los Pinos 08/31/92 DLP2542 12 37 2 2 7 14 17 Los Pinos 12/02/93 La Boca 1 6 22 

Navajo 10/20/71 Below OSO diversion dam 1 9 1 Navajo 03/29/72 Edith, Colorado (stateline) 7 2 1 8 Navajo 03/29/72 Below OSO diversion dam 1 3 6 1 Navajo 04/18/72 Juanita, Colorado 65 5 3 60 Navajo 06/20/72 Edith, Colorado (stateline) 9 14 4 13 Navajo 06/20/72 Below OSO diversion dam 9 2 2 Navajo 09/19/74 Edith, Colorado (stateline) 10 16 1 55 4 1 Navajo 09/19/74 Below OSO diversion dam 22 18 22 11 Navajo 10/18/77 Below OSO diversion dam 1 13 43 10 Navajo 08/04/87 BIA A 1 1 Navajo 08/04/87 BIA B 1 8 Navajo 08/04/87 BIA C Navajo 07/15/92 MRB0058 30 8 11 1 1 3 5 Navajo 09/22/93 JEB1469 5 7 73 2 Navajo 09/22/93 JEB1470 13 8 34 1 1 2 1 Navajo 09/22/93 JEB1473 36 2 21 1 1 1 4 Navajo 09/22/93 JEB1472 9 3 6 1 3 1 Navajo 09/22/93 JEB1471 4 1 15 Navajo 09/22/93 JEB1471 (pool) 1 7 9 1 4 

Piedra 10/27/76 Bridge above Tres Piedres Ranch 24 53 1 12 13 1 Piedra 10/27/76 Hwy 160 1 18 3 Piedra 01/01/83 Near Stollsteimer 10 9 4 128 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 

9

Table A-3 (continued). Abundance of fishes collected from sampling sites on tributaries upstream of Navajo Reservoir.

Species 

 Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK ONCNER SALFON SALTRU CYPCAR NOTCRY PIMPRO CATCOM SUCK

Piedra 01/01/83 Near Pine Tree Canyon Confl. 64 10 3 1 1 138 Piedra 11/17/83 1 mi. N of Hwy 160 bridge 4 2 13 2 Piedra 11/17/83 Bridge above Tres Piedres Ranch 10 1 7 1 Piedra 11/09/87 Below Fassett Gulch Bridge 1 3 16 3 1 Piedra 10/19/88 Lower Piedra CG. 11 19 20 2 Piedra 10/19/88 Below Tres Piedras Ranch bound 11 1 34 7 6 Piedra 09/24/91 1/4 mi. above Indian Cr. confl. 85 44 8 Piedra 07/15/92 Watt's 7 3 7 32 7 1 2 Piedra 07/15/92 Gallego's 1 28 2 2 Piedra 07/16/92 Taylor's 1 2 1 Piedra 12/02/93 WJM/SUIT #2 1 2 2 9 6 3 Piedra 12/02/93 WJM/SUIT 1-1 2 1 3 

Rock Creek 06/24/80 Hwy 172 15 15 3 

San Juan 11/11/87 1/2 mi. E of Pagosa Junction 17 18 2 80 1 San Juan 10/11/88 1/4 mi. above Harvey Catchpole's 9 2 1 1 San Juan 10/24/89 Perkins Property 5 181 7 4 3 San Juan 07/15/92 MRB0059 18 5 1 San Juan 09/03/92 To Pagosa Jct. 1 7 51 10 35 3 2 10 2 1 20 7 San Juan 09/03/92 Pagosa Jct. Down 6 9 44 27 13 3 1 5 2 23 6 San Juan 09/03/92 DLP2559 25 56 13 25 1 4 20 8 San Juan 09/03/92 Frijoles Canyon (a) 1 9 11 16 5 4 2 4 30 1 San Juan 09/03/92 Frijoles Canyon (b) 2 13 47 26 25 2 4 2 25 3 San Juan 09/03/92 DLP2562 19 27 19 26 1 8 1 3 28 15 San Juan 09/08/92 LAA294 3 36 40 7 31 9 1 6 San Juan 09/08/92 LAA295 4 52 23 7 60 9 2 4 San Juan 09/08/92 LAA296 1 4 66 18 12 83 17 5 6 San Juan 09/08/92 LAA297 22 62 14 32 29 5 10 San Juan 09/08/92 LAA298 12 38 31 24 8 3 7 7 San Juan 09/08/92 LAA299 2 30 12 6 7 4 1 4 San Juan 09/09/92 LAA300 1 1 7 15 4 4 1 1 8 2 San Juan 09/09/92 LAA301 2 48 30 2 1 8 6 San Juan 09/09/92 LAA302 5 3 23 40 9 4 5 10 10 San Juan 09/09/92 LAA303 1 3 15 9 4 5 3 4 3 San Juan 12/02/93 WJM/SUIT 1-1 2 8 5 14 1 

Stollsteimer 07/15/92 MRB0060 104 20 1 4 13 6 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 10Table A-4. Site location descriptions for sites upstream of Navajo Reservoir.

River County Date Site Sample # Method Time Area Township Range 

Los Pinos La Plata 11/13/1973 La Boca Bridge CDOW EL 32N 7W Los Pinos La Plata 11/13/1973 Severo Canal CDOW EL 32N 7W Los Pinos La Plata 11/13/1973 Ignacio Bridge CDOW EL 33N 7W Los Pinos La Plata 11/13/1973 CDOW EL Los Pinos La Plata 12/11/1975 HWY 160 Bridge CDOW 4 EL 34N 7W Los Pinos La Plata 12/11/1975 6 miles South of Ignacio CDOW EL 32N 7W Los Pinos La Plata 12/11/1975 3 miles South of Ignacio CDOW EL 33N 7W Los Pinos La Plata 12/11/1975 1/4 mi. above Agency Bridge - Ignacio CDOW EL 33N 7W Los Pinos La Plata 03/19/1992 "Little Pine R. braid" - below HWY 160 CDOW 4A EL 34N 7W Los Pinos La Plata 07/14/1992 Rodeo USFS (MRB0053-54) EL 33N 7W Los Pinos La Plata 07/14/1992 Rock Creek USFS (MRB0055) EL 33N 7W Los Pinos La Plata 07/14/1992 Railway Trestle USFS (MRB0056) EL 32N 7W Los Pinos La Plata 08/31/1992 DLP2542 (DLP2542) EL 1735 32N 7W Los Pinos La Plata 12/02/1993 La Boca WJM/SUIT EL 777 32N 7W 

Navajo Archuleta 10/20/1971 Below OSO diversion dam CDOW 2 EL 32N 1W Navajo Archuleta 03/29/1972 Edith, Colorado (stateline) CDOW 1 EL 32N 1W Navajo Archuleta 03/29/1972 Below OSO diversion dam CDOW 2 EL 32N 1W Navajo Archuleta 04/18/1972 Juanita, Colorado CDOW EL 32N 3W Navajo Archuleta 06/20/1972 Edith, Colorado (stateline) CDOW 1 EL 32N 1W Navajo Archuleta 06/20/1972 Below OSO diversion dam CDOW 2 EL 32N 1W Navajo 09/19/1974 Edith, Colorado (stateline) CDOW 1 EL 32N 1W Navajo 09/19/1974 Below OSO diversion dam CDOW 2 EL 32N 1W Navajo 10/18/1977 Below OSO diversion dam CDOW 2 EL 32N 1W Navajo Rio Arriba, NM 08/04/1987 1.5m upstream of Encarnacion Canyon BIA A EL 32N 2W Navajo Rio Arriba, NM 08/04/1987 0.5m upstream of Encarnacion Canyon BIA B EL 32N 2W Navajo Rio Arriba, NM 08/04/1987 Below La Juita Canyon BIA C EL 32N 2W Navajo Archuleta 07/15/1992 MRB0058 USFWS - (MRB0058) EL 32N 3W Navajo Rio Arriba, NM 09/22/1993 USFWS - JEB1469 USFWS - JEB1469 EL 1692 32N 1W Navajo Rio Arriba, NM 09/22/1993 USFWS - JEB1470 USFWS - JEB1470 EL 1139 32N 2W Navajo Rio Arriba, NM 09/22/1993 USFWS - JEB1473 USFWS - JEB1473 EL 863 32N 2W Navajo Rio Arriba, NM 09/22/1993 USFWS - JEB1472 USFWS - JEB1472 EL 959 32N 2W Navajo Archuleta 09/22/1993 USFWS - JEB1471 USFWS - JEB1471 EL 970 32N 3W Navajo Archuleta 09/22/1993 USFWS - JEB1471 (pool) USFWS - JEB1471 (pool) EL 618 32N 3W 

Piedra Archuleta 10/27/1976 Bridge above Tres Piedres Ranch CDOW 2 EL 35N 4W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 11Table A-4 (continued). Site location descriptions for sites upstream of Navajo Reservoir.

River County Date Site Sample # Method Time Area Township Range 

Piedra Archuleta 10/27/1976 HWY 160 34N 4W Piedra Archuleta 01/01/1983 Near Stollsteimer 34N 5W Piedra Archuleta 01/01/1983 Near Pine Tree Canyon confluence 33N 5W Piedra Archuleta 11/17/1983 1 mile North of HWY 160 Bridge CDOW 1 EL 34N 4W Piedra Archuleta 11/17/1983 Bridge above Tres Piedres Ranch CDOW 2 EL 35N 4W Piedra Archuleta 11/09/1987 Below Fassett Gulch Bridge CDOW -A -1 EL 33N 5W Piedra Archuleta 10/19/1988 Lower Piedra CG. - immediately below CDOW - 1B EL 33N 4W Piedra Archuleta 10/19/1988 Below Tres Piedres Ranch Boundary CDOW - 1C EL 35N 4W Piedra Archuleta 09/24/1991 1/4 mile above Indian Creek Confluence CDOW - 3 EL 35N 4W Piedra Archuleta 07/15/1992 Watt's USFWS - (MRB0061) EL 33N 5W Piedra Archuleta 07/15/1992 Gallego's USFWS - (MRB0062) EL 33N 5W Piedra Archuleta 07/16/1992 Taylor's USFWS - (MRB0063) EL 33N 5W Piedra Archuleta 12/02/1993 Between Stollsteimer crk & Res. bndry WJM/SUIT #2 (reference) EL 690 33N 5W Piedra Archuleta 12/02/1993 Bridge -about 2mi. below Stollsteimer crk WJM/SUIT 1-1 EL 590 33N 5W 

Rock Creek La Plata 06/24/1980 1/4 mi. west of HWY 172 -Los Pinos Trib. CDOW 1 33N 7W 

San Juan Archuleta 11/11/1987 1/2 mile East of Pagosa Junction CDOW 1 32N 3W San Juan Archuleta 10/11/1988 1/4 mile above Harvey Catchpole's Ranch CDOW 5 35N 2W San Juan Archuleta 10/24/1989 Perkins property CDOW 3 34N 2W San Juan Archuleta 07/15/1992 MRB0059 USFWS - (MRB0059) EL 32N San Juan Archuleta 09/03/1992 Ends at Pagosa Junction NMGF - (DLP2557) BOAT EL 1856 32N 3W San Juan Archuleta 09/03/1992 Begins at Pagosa Junction NMGF - (DLP2558) BOAT EL 1487 32N 3W San Juan Archuleta 09/03/1992 DLP2559 NMGF - (DLP2559) BOAT EL 1351 32N 3W San Juan Archuleta 09/03/1992 Ends 300m below Frijoles Canyon NMGF - (DLP2560) BOAT EL 853 32N 4W San Juan Archuleta 09/03/1992 Begins 300m below Frijoles Canyon NMGF - (DLP2561) BOAT EL 1808 32N 4W San Juan Archuleta 09/03/1992 DLP2562 - A NMGF - (DLP2562-A) BOAT EL 1628 32N 4W San Juan Archuleta 09/08/1992 LAA294 NMGF - LAA294 BOAT EL 33N 2W San Juan Archuleta 09/08/1992 LAA295 NMGF - LAA295 BOAT EL 33N 2W San Juan Archuleta 09/08/1992 LAA296 NMGF - LAA296 BOAT EL 33N 2W San Juan Archuleta 09/08/1992 LAA297 NMGF - LAA297 BOAT EL 33N 2W San Juan Archuleta 09/08/1992 Hersch Canyon NMGF - LAA298 BOAT EL 33N 2W San Juan Archuleta 09/08/1992 Trail Canyon NMGF - LAA299 BOAT EL 32N 3W San Juan Archuleta 09/09/1992 HWY 500 Bridge NMGF - LAA300 BOAT EL 32N 3W San Juan Archuleta 09/09/1992 Navajo Confluence NMGF - LAA301 BOAT EL 32N 3W San Juan Archuleta 09/09/1992 LAA302 NMGF - LAA302 BOAT EL 32N 3W San Juan Archuleta 09/09/1992 0.6 mi. above Gomez Canyon NMGF - LAA303 BOAT EL 32N 3W San Juan Archuleta 12/02/1993 Upstream of Navajo Reservior WJM/SUIT 1-1 EL 880 32N 3W 

Stollsteimer Archuleta 07/15/1993 Confluence with Piedra River USFWS - (MRB0060) EL 33N 5W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 12Table A-5. Abundance of fishes collected from sampling sites downstream from Navajo Reservoir (1990-Present). 

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFO

N 

CYPLUT CYPCAR PIMPRO CATCOM SUCKER SUCKER

X 

Animas 1 07/08/92 Bondad to Stateline 7 6 22 1 6 2 Animas 1 08/31/92 Cedar Hill - Aztec 1 24 1 6 9 Animas 1 08/31/92 Irrigation Ditch 67 47 31 20 2 2 2 Animas 1 09/01/92 Cedar Hill - Aztec 2 21 9 11 10 Animas 1 09/01/92 Cedar Hill - Aztec 3 2 64 39 12 14 Animas 1 09/01/92 Cedar Hill - Aztec 4 3 66 35 26 10 1 Animas 1 09/01/92 Cedar Hill - Aztec 5 2 37 41 14 9 4 1 Animas 1 09/01/92 Cedar Hill - Aztec 6 18 26 46 48 11 2 2 Animas 1 09/01/92 Cedar Hill - Aztec 7 8 47 52 23 1 10 3 1 1 Animas 1 09/01/92 Cedar Hill - Aztec 8 12 34 47 40 4 1 Animas 1 09/01/92 Cedar Hill - Aztec 9 42 64 53 30 6 3 Animas 1 09/01/92 Cedar Hill - Aztec 10 96 159 111 27 1 4 3 4 2 Animas 1 09/01/92 Cedar Hill - Aztec 11 12 79 106 7 3 4 Animas 1 09/01/92 Cedar Hill - Aztec 12 15 102 113 5 2 9 Animas 1 08/25/94 1.7 road mi. South from stateline 2 69 125 12 1 18 4 Animas 1 08/25/94 Abuts on CO-1 to 3/4 mi. N of stateline Animas 1 08/25/94 USGS guage N of Twin Crossing 121 131 13 1 26 2 10 1 Animas 1 08/26/94 Begin down of big bend near Hwy 550 2 43 68 10 12 3 Animas 1 08/26/94 Begin at aquaduct upstrm of Ceder Hill 3 127 133 10 25 3 Animas 1 08/27/94 Miller St. bridge to H2O trtmnt plant 14 30 18 1 2 1 7 Animas 1 08/27/94 Midway between Aztec & Flora Vista 8 26 41 3 2 5 6 Animas 1 08/27/94 3 mi. upstream of Hwy 550 bridge 30 114 49 4 7 2 Animas 1 08/30/94 Twin Crossing up from railroad bridge 3 1 Animas 1 08/30/94 USGS Gauging Sation 2 2 1 Animas 1 08/30/94 1/4 mi. down from Florida confluence 3 Animas 1 08/30/94 200 yds down from Florida confluence 2 Animas 1 08/31/94 1.7 road mi. South from stateline 1 22 83 11 11 3 4 Animas 1 08/31/94 Abuts on CO-1 to 3/4 mi. N of stateline 1 Animas 1 08/31/94 USGS guage N of Twin Crossing 2 139 184 9 2 28 6 2 Animas 1 09/01/94 Midway between Aztec & Flora Vista 6 10 41 4 3 3 5 Animas 1 09/01/94 3 mi. upstream of Hwy 550 bridge 5 96 59 5 5 1 Animas 1 09/01/94 Begin down of big bend near Hwy 550 39 83 5 1 6 5 Animas 1 09/01/94 Begin at aquaduct upstrm of Ceder Hill 23 79 6 2 Animas 2 10/17/90 Handlebar cycle-Purple Cliffs-2.4 mi. 213 123 P Animas 2 10/23/91 4-Corners Marine-Purple Cliffs-2.4 mi. 1 22 242 P Animas 2 07/01/92 Purple Cliffs to Stateline P P P P P P P P Animas 2 07/06/92 Purple Cliffs to Basin Creek 5 5 15 6 6 2 Animas 2 07/07/92 Weaselskin bridge to Bondad 5 6 18 3 8 Animas 2 07/16/92 Goat Canyon 29 11 6 2 1 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 13

Table A-5 (continued). Abundance of fishes collected from sampling sites downstream from Navajo Reservoir (1990-Present). 

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFO

N 

CYPLUT CYPCAR PIMPRO CATCOM SUCKER SUCKER

X 

Animas 2 07/16/92 La Posta 11 3 1 1 Animas 2 07/16/92 S. of La Posta 3 4 2 Animas 2 07/16/92 High Flume Canyon 20 3 1 Animas 2 07/16/92 Pipeline Crossing 11 77 Animas 2 07/16/92 W. of Bondad Hill 27 6 1 1 Animas 2 07/16/92 200m above takeout 40 10 3 Animas 2 09/15/92 Basin Crk 8 2 103 2 1 Animas 2 09/15/92 Weaselskin Bridge 4 4 167 2 1 Animas 2 09/15/92 La Posta Canyon 4 1 5 57 4 6 3 Animas 2 09/15/92 Bondad Bridge 2 8 66 2 1 Animas 2 11/17/93 32nd St. bridge-9th St. bridge 100 10 39 14 179 341 12 Animas 2 11/18/93 4 Corners Marine-Hwy 160 bridge 160 4 21 89 185 6 3 Animas 2 08/23/94 Dairy plant luanch near Purple Cliffs 108 50 44 2 58 48 3 5 1 Animas 2 08/24/94 3/4 mi. N of La Posta to 1/4 mi. S 225 120 30 8 4 42 17 5 Animas 2 08/24/94 S of Basin Cr. to N of Weaselskin brdg 1 168 113 9 18 12 31 9 1 Animas 2 08/25/94 3/4 mi. up of Bondad Brdg to USGS guage Animas 2 08/29/94 S of Basin Cr. to N of Weaselskin brdg 73 32 4 12 3 1 5 Animas 2 08/29/94 Dairy plant launch near Purple Cliffs 64 19 6 30 22 1 3 1 Animas 2 08/30/94 At chub #2 launch site 7 1 4 Animas 2 08/30/94 3/4 mi. N of La Posta to 1/4 mi. S 71 30 7 3 1 9 3 3 Animas 2 08/31/94 3/4 mi. up of Bondad Brdg to USGS guage Animas 2 09/01/94 Gateway Park to Hwy 160 495 11 143 3 208 196 7 1 Animas 2 09/01/94 Midway between Aztec & Flora Vista 6 10 41 4 3 3 5 Animas 2 09/01/94 3 mi. upstream of Hwy 550 bridge 5 96 59 5 5 1 Animas 2 09/01/94 Begin down of big bend near Hwy 550 39 83 5 1 6 5 Animas 2 09/01/94 Begin at aquaduct upstrm of Ceder Hill 23 79 6 2 Animas 2 09/07/94 32nd St. bridge to 9th St. bridge 207 17 102 1 315 267 43 6 Animas 2 07/30/96 West bank upstream of Basin Creek 9 20 47 Animas 2 07/30/96 Below K-Mart parking lot 37 2 7 Animas 2 07/30/96 Riffle behind Durango High School 20 38 6 Animas 2 07/31/96 1/4 mi. above High Flume Canyon 7 46 22 Animas 2 07/31/96 West bank upstream of Weaselskin Bridge 7 1 87 2 9 1 11 Animas 2 09/16/96 32nd St. bridge to 9th St. bridge 1 75 12 24 3 198 243 8 6 Animas 2 09/01/96 Gateway Park to Hwy 160 68 2 57 7 262 310 1 2 Animas 2 07/16/97 West bank upstream of Basin Creek 25 1 97 Animas 2 07/15/97 Below K-Mart parking lot 19 10 Animas 2 07/15/97 Riffle behind Durango High School 1 5 Animas 2 07/16/97 1/4 mi. above High Flume Canyon 10 116 Animas 2 07/16/97 West bank upstream of Weaselskin Bridge 25 1 25 1 133 Animas 2 08/01/97 Reach 1-Purple cliffs to Basin Creek P P P P P P P P P P Animas 2 08/02/97 Reach 2-Basin Creek to Weaselskin Bridge P P P P P P P P P P Animas 2 08/03/97 Reach 3-Weasleskin Bridge to Bondad P P P P P P P P P P Animas 2 07/16/98 West bank upstream of Basin Creek 15 2 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 14

Table A-5 (continued). Abundance of fishes collected from sampling sites downstream from Navajo Reservoir (1990-Present). 

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFO

N 

CYPLUT CYPCAR PIMPRO CATCOM SUCKER SUCKER

X 

Animas 2 07/16/98 Below K-Mart parking lot 1 12 11 16 3 Animas 2 07/17/98 Riffle behind Durango High School 13 3 1 1 Animas 2 07/16/98 1/4 mi. above High Flume Canyon 1 18 3 Animas 2 07/16/98 West bank upstream of Weaselskin Bridge 21 16 20 4 Animas 2 09/01/98 Gateway Park to Hwy 160 2 172 6 106 4 208 130 3 Animas 2 09/08/98 32nd St. bridge to 9th St. bridge 1 88 8 27 1 132 94 31 6 Animas 2 09/21/98 RM 48.4-49.0 Sample 98ANI18 14 1 22 54 25 Animas 2 09/21/98 RM 49.0-49.4 Sample 98ANI17 35 17 38 92 43 1 4 Animas 2 09/21/98 RM 49.4-49.8 Sample 98ANI16 86 16 30 50 11 1 3 Animas 2 09/21/98 RM 49.8-50.1 Sample 98ANI15 37 26 19 22 19 3 5 Animas 2 09/21/98 RM 50.1-50.7 Sample 98ANI14 45 30 37 19 8 2 Animas 2 09/21/98 RM 50.7-51.1 Sample 98ANI13 54 18 34 19 16 3 Animas 2 09/21/98 RM 51.1-51.5 Sample 98ANI12 49 24 44 24 15 4 1 Animas 2 09/21/98 RM 51.5-52.3 Sample 98ANI11 12 44 125 16 Animas 2 09/21/98 RM 52.3-52.7 Sample 98ANI10 42 13 11 48 17 3 Animas 2 09/21/98 RM 52.7-53.1 Sample 98ANI09 53 5 6 37 24 5 Animas 2 09/21/98 RM 53.1-53.7 Sample 98ANI08 9 14 8 33 21 2 1 Animas 2 09/21/98 RM 53.7-54.0 Sample 98ANI07 21 40 4 20 21 8 Animas 2 09/21/98 RM 54.0-54.6 Sample 98ANI06 44 2 7 40 21 2 Animas 2 09/21/98 RM 54.6-55.0 Sample 98ANI05 21 5 4 27 15 1 Animas 2 09/21/98 RM 55.0-55.5 Sample 98ANI04 40 24 2 16 11 1 2 Animas 2 09/21/98 RM 55.5-55.8 Sample 98ANI03 35 19 1 23 43 3 2 1 Animas 2 09/21/98 RM 55.8-56.2 Sample 98ANI02 26 10 2 11 3 4 Animas 2 09/21/98 RM 56.2-57.0 Sample 98ANI01 79 18 7 66 52 3 2 Animas 3 09/07/94 32nd St. bridge to 9th St. bridge N P N N Animas 3 09/20/94 32rd St. bridge to 9th St. bridge N P N N 

Cherry Crk. 1 02/04/92 Lamour Ranch 5 

Florida 1 07/29/90 20.7 mi. abv Animas R. -Lunt Ranch 13 Florida 1 07/29/90 0.6 mi. above Animas R. Confl. 23 Florida 1 1991 20.7 mi. abv Animas R. -Lunt Ranch 1 1 3 Florida 1 1991 0.6 mi. above Animas R. Confl. 16 6 Florida 1 07/15/92 Salt Crk Confluence 14 2 1 1 3 2 Florida 1 08/07/92 3/4 mi. above Animas R. Confl. 1 10 20 9 1 1 3 Florida 1 09/16/92 Bondad Hill 18 14 5 3 4 7 5 Florida 1 09/17/92 Airport Road 66 1 Florida 1 09/17/92 Gasplant 6 5 1 3 Florida 1 08/24/93 Short Ranch 2 34 8 4 3 1 1 5 Florida 1 08/24/93 Paxton Ranch 1 25 4 1 3 1 Florida 1 03/31/94 Paxton's: E of Hwy 550 at Bondad Hill 15 3 29 1 6 5 Florida 1 03/31/94 Short's: up from Sunny Side School Brdg 99 9 8 8 11 Florida 1 07/15/94 Immediately downstream of 'Florida 1' 5 124 11 5 1 7 1 1 Florida 1 07/15/94 Paxton's: E of Hwy 550 at Bondad Hill 7 187 11 8 1 1 9 1 2 4 Florida 1 07/16/94 Short's: up from Sunny Side School Brdg 215 3 3 9 1 8 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 15

Table A-5 (continued). Abundance of fishes collected from sampling sites downstream from Navajo Reservoir (1990-Present). 

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFO

N 

CYPLUT CYPCAR PIMPRO CATCOM SUCKER SUCKER

X 

Florida 1 07/16/94 Short's: immediately up from 'Florida 2' 1 314 28 7 1 17 7 21 1 Florida 1 09/09/94 Immediately downstream of 'Florida 1' 1 41 116 15 1 1 6 6 4 1 Florida 1 09/09/94 Paxton's: E of Hwy 550 at Bondad Hill 4 102 65 10 8 2 1 6 1 Florida 1 09/12/94 Short's: up from Sunny Side School Brdg 5 185 99 17 2 12 14 16 7 Florida 1 09/12/94 Short's: immediately up from 'Florida 2' 1 157 68 12 1 4 2 13 1 

La Plata 1 02/05/92 1.5 mi. S. La Plata, 1 mi. E. HWY 170 6 11 La Plata 1 02/05/92 1mi S of Jackson lk-0.5mi E of hwy 170 15 La Plata 1 04/29/92 0.5 - 1.5 mi. S. of NM - CO stateline P P P P P P La Plata 1 04/30/92 0.5 - 1.5 mi. S. of NM - CO stateline P P P P P P La Plata 1 09/02/92 0.5 - 1.5 mi. S. of NM - CO stateline P P P P P P P La Plata 1 09/02/92 DLP2554 141 7 44 2 La Plata 1 11/30/93 1.5 mi. S. of NM - CO stateline 166 33 43 2 7 1 3 La Plata 1 03/28/94 New Mexico: 2 mi. S of stateline 133 24 38 2 3 La Plata 1 03/28/94 Site 2: N. M., 0.9 mi. N of Hwy140 brdg 233 10 82 3 1 7 La Plata 1 07/21/94 New Mexico: 2 mi. S of stateline 537 97 256 3 1 22 La Plata 1 07/22/94 Immediately downstream of 'site 2' 1 628 123 259 1 4 La Plata 1 07/22/94 Site 2: N. M., 0.9 mi. N of Hwy140 brdg 794 169 388 2 14 La Plata 1 07/22/94 Immediately upstream of 'site 2' 3 1891 120 361 77 La Plata 1 09/14/94 New Mexico: 2 mi. S of stateline 554 83 212 2 17 La Plata 1 09/15/94 Immediately downstream of 'site 2' 7 554 55 208 2 1 12 La Plata 1 09/15/94 Site 2: N. M., 0.9 mi. N of Hwy140 brdg 2 1081 32 520 1 27 La Plata 1 09/15/94 Immediately upstream of 'site 2' 1 1604 59 370 1 2 57 La Plata 1 11/19/98 RM 26.0-26.4 Sample 98LAP26-30 2 717 102 156 5 1 18 La Plata 1 11/19/98 RM 26.4-26.5 Sample 98LAP31 110 14 22 1 2 11 La Plata 2 02/05/92 Bridge – 1/4 mi. N. of Stateline 1 15 5 3 La Plata 2 02/06/92 1/4 mi. below Long Hollow Crk Confl. 1 45 6 3 4 La Plata 2 09/02/92 DLP2555 1 222 26 78 2 1 10 La Plata 2 09/02/92 DLP2556 270 22 129 1 1 5 La Plata 2 09/16/92 Below Long Hollow Crk 260 49 59 3 La Plata 2 10/25/93 Van C. Smith's - 1 28 87 4 2 1 La Plata 2 10/26/93 Jerry Baird's - 6 23 173 28 179 1 2 La Plata 2 10/26/93 Van C. Smith's - 2 154 2 63 2 1 1 La Plata 2 10/26/93 Van C. Smith's - 3 3 66 14 65 La Plata 2 10/26/93 Van C. Smith's - 4 1 7 7 41 2 La Plata 2 10/27/93 Elmer Thompson's 54 46 8 2 3 La Plata 2 10/27/93 Jerry Baird's - 2 44 36 5 1 La Plata 2 10/27/93 Jerry Baird's - 3 5 169 39 157 3 2 La Plata 2 10/28/93 Jerry Baird's - 5 17 42 8 36 La Plata 2 10/28/93 Jerry Baird's - 1 2 188 44 41 1 1 2 La Plata 2 10/28/93 Jerry Baird's - 4 19 12 5 42 1 La Plata 2 11/29/93 Long Hollow Crk Confl, Downstream 23 87 1 2 La Plata 2 11/30/93 1/4 mi. S. of NM - CO stateline 19 41 44 2 1 1 La Plata 2 03/29/94 Baird's: 1mi. N of stateline on Hwy 140 3 64 7 56 3 1 1 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 16

Table A-5 (continued). Abundance of fishes collected from sampling sites downstream from Navajo Reservoir (1990-Present). 

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFO

N 

CYPLUT CYPCAR PIMPRO CATCOM SUCKER SUCKER

X 

La Plata 2 03/29/94 3a-K: Immediately upstream of 'site 3' 20 216 19 105 1 1 1 La Plata 2 03/30/94 Immediately upstream of 'site 3a-K' 44 403 29 120 La Plata 2 04/01/94 Up to Long Hollow confluence 193 28 61 1 4 17 La Plata 2 07/13/94 Immediately downstream of 'site 3' 30 1335 87 340 1 15 La Plata 2 07/14/94 Baird's: 1mi. N of stateline on Hwy 140 8 447 61 134 2 2 16 La Plata 2 07/25/94 Immediately upstream of 'site 3' 93 1755 122 394 14 La Plata 2 07/27/94 Up to Long Hollow confluence 5 1286 462 458 1 3 11 20 La Plata 2 09/16/94 Immediately downstream of 'site 3' 19 491 33 287 3 41 La Plata 2 09/19/94 Baird's: 1mi. N of stateline on Hwy 140 11 207 12 185 1 62 La Plata 2 09/19/94 Immediately upstream of 'site 3' 93 806 107 477 1 51 La Plata 2 09/21/94 Up to Long Hollow confluence 3 430 205 213 3 11 7 La Plata 2 11/21/97 Cherry Creek Confluence to Stateline 171 1125 440 1425 1 8 66 22 53 La Plata 2 11/17/98 RM 29.7-30.0 Sample 98LAP09-14 34 307 19 104 1 27 La Plata 2 11/17/98 RM 30.0-30.2 Sample 98LAP15-16 18 168 24 98 1 2 La Plata 2 11/18/98 RM 31.5-31.8 Sample 98LAP17-19 72 12 79 4 1 La Plata 2 11/18/98 RM 31.8-32.2 Sample 98LAP20-25 5 242 98 121 1 1 9 1 1 La Plata 3 02/06/92 Cherry Crk Confluence, Downstream 30 3 1 La Plata 3 09/17/92 Cherry Crk. Confluence 45 5 2 1 La Plata 3 08/23/93 Lower Section SU1 402 25 La Plata 3 08/25/93 Southern Ute #4 340 77 49 5 3 La Plata 3 08/25/93 Southern Ute #3 602 62 46 4 2 La Plata 3 08/25/93 Southern Ute #2 171 22 33 3 La Plata 3 08/25/93 Southern Ute #1 24 2 4 La Plata 3 10/29/93 Conrad W. Huntington's #1 84 1 22 3 10 La Plata 3 10/29/93 Conrad W. Huntington's #2 732 27 22 13 4 La Plata 3 10/29/93 Conrad W. Huntington's #3 23 4 4 La Plata 3 11/29/93 Long Hollow Crk Confl, Upstream 401 10 31 3 11 La Plata 3 04/01/94 Huntington's: co. rd. 100 E to prvt land 92 6 17 5 1 La Plata 3 04/02/94 Southern Ute land-east from Red Mesa 621 21 100 3 10 2 1 1 La Plata 3 07/26/94 Southern Ute land-east from Red Mesa 1138 77 429 11 7 19 La Plata 3 07/27/94 Huntington's: co. rd. 100 E to prvt land 1 1895 155 339 36 3 1 La Plata 3 09/13/94 Southern Ute land-east from Red Mesa 1088 153 461 2 4 18 La Plata 3 09/14/94 Huntington's: co. rd. 100 E to prvt land 2861 149 152 28 2 4 La Plata 3 11/16/98 RM 37.3-37.5 Sample 98LAP01-04 273 93 50 1 5 3 5 La Plata 3 11/16/98 RM 37.5-37.8 Sample 98LAP05-08 1 632 253 98 16 11 4 La Plata 4 02/04/92 Hesperus-dwnstm of bigstick divers. 10 2 4 3 La Plata 4 02/05/92 1 mi. below Mormon Reservoir 15 6 1 La Plata 4 09/17/92 County Rd 122 3 La Plata 4 09/17/92 County Rd 119 12 15 

Long Hollow 1 09/06/92 1/4 mi. upstream of La Plata Confl. 11 5 6 1 Long Hollow 1 09/06/92 3 mi. from mouth at road xing (rd 122?). 30 

Mancos 1 03/24/94 Ute Mtn Ute land at CO-NM stateline 4 1 36 51 6 Mancos 1 03/24/94 (UMUT) Mancos R.-Navajo Wash confl. 41 16 6 90 10 1 8 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 17

Table A-5 (continued). Abundance of fishes collected from sampling sites downstream from Navajo Reservoir (1990-Present). 

Species 

Native Introduced 

River Reach Date Site GILROB RHIOSC CATDIS CATLAT COTBAI ONCCLA ONCMYK SALFON SALTRU TRUXFO

N 

CYPLUT CYPCAR PIMPRO CATCOM SUCKER SUCKER

X 

Mancos 1 07/19/94 Immediately downstream of 'site 3' 63 54 1 16 2 Mancos 1 07/20/94 Ute Mtn Ute land at CO-NM stateline 4 2 6 45 1 12 Mancos 1 07/20/94 (UMUT) Mancos R.-Navajo Wash confl. 14 16 7 10 4 Mancos 1 09/07/94 Ute Mtn Ute land at CO-NM stateline 4 25 5 2 5 Mancos 1 09/07/94 (UMUT) Mancos R.-Navajo Wash confl. 19 1 7 4 16 Mancos 1 09/07/94 Immediately downstream of 'site 3' 4 2 Mancos 2 03/22/94 (UTUM) Down of Johnson Canyon confl. 31 29 13 Mancos 2 03/23/94 (UMUT) Site 3: Up from guage Hwy 666 19 19 2 9 Mancos 2 03/23/94 (UMUT) At Moqui Canyon Confluence 29 57 1 7 Mancos 2 07/18/94 (UTUM) Down of Johnson Canyon confl. 5 48 4 Mancos 2 07/19/94 (UMUT) Site 3: Up from guage Hwy 666 44 282 1 20 4 1 Mancos 2 07/19/94 (UMUT) At Moqui Canyon Confluence 59 642 24 Mancos 2 09/07/94 (UMUT) Site 3: Up from guage Hwy 666 NO FISH Mancos 2 09/08/94 (UMUT) At Moqui Canyon Confluence 7 27 5 3 Mancos 2 09/08/94 (UTUM) Down of Johnson Canyon confl. 7 23 2 5 Mancos 3 08/20/90 2 mi. N. of MV Natl. Park 1 23 2 14 Mancos 3 08/20/90 N. Boundary MV Natl. Park 3 3 38 Mancos 3 08/21/90 Above S. bdry MV Natl. Park 7 10 1 4 Mancos 3 08/22/90 1/8 mi. below hwy 160 bridge 36 1 60 3 Mancos 3 08/22/90 H Road Bridge 23 21 2 15 Mancos 3 08/23/90 S. boundary MV Natl. Park 3 6 4 21 Mancos 3 08/23/90 0.5 mi. S of MV Natl. Park 3 11 15 Mancos 3 08/23/90 Upstream of Trail Canyon 2 12 10 15 Mancos 3 03/22/94 (UTUM) Up of Johnson Canyon confl. 126 47 5 11 Mancos 3 07/18/94 (UTUM) Up of Johnson Canyon confl. 23 85 5 Mancos 3 09/08/94 (UTUM) Up of Johnson Canyon confl. 24 74 2 10 

McElmo 1 05/10/94 8.5 mi. up from stateline 2 1 50 7 McElmo 1 05/10/94 1/4 mi. E. of Ismay trading Post 2 9 186 2 1 4 McElmo 1 05/11/94 S. Oak Street, Cortez 14 10 102 McElmo 1 05/11/94 Bridge at County Road J 1 2 28 

N = numerous. 

P = present. 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 18Table A-6. Site location descriptions for sites downstream of Navajo Reservoir (1990 - Present). 

River County Sample Date Site Sample # Method Time Area Township Range Animas La Plata, CO 10/17/1990 Handlebar cycle to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 10/23/1991 4-Corners Marine to Purple Cliffs - 2.4 mi. CDOW 3 B BOAT EL 34N 9W Animas La Plata, CO 07/01/1992 Purple Cliffs to Stateline CDOW 1 B (Nehring) BOAT EL Animas La Plata, CO 07/06/1992 Purple Cliffs to Basin Creek BREC 13 BOAT EL Animas La Plata, CO 07/07/1992 Weaselskin bridge to Bondad BREC 14 BOAT EL Animas La Plata, CO 07/08/1992 Bondad to Stateline BREC 15 BOAT EL 32N 9W Animas La Plata, CO 7/16/92 200m above takeout (MRB0071) EL 33N 10W Animas La Plata, CO 7/16/92 Goat Canyon (MRB0064) EL 34N 10W Animas La Plata, CO 7/16/92 High Flume Canyon (MRB0068) EL 33N 10W Animas La Plata, CO 7/16/92 La Posta (MRB0065) EL 33N 10W Animas La Plata, CO 7/16/92 Pipeline Crossing (MRB0069) EL 33N 10W Animas La Plata, CO 7/16/92 S. of La Posta (MRB0067) EL 33N 10W Animas La Plata, CO 7/16/92 W. of Bondad Hill (MRB0070) EL 33N 10W Animas San Juan, NM 8/31/92 Cedar Hill - Aztec 1 (DLP2541) EL 1285 31N 10W Animas San Juan, NM 8/31/92 Irrigation Ditch (DLP2540) EL 3036 31N 10W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 10 (DLP2551) EL 1260 31N 11W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 11 (DLP2552) EL 1228 30N 11W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 12 (DLP2553) EL 1633 30N 11W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 2 (DLP2543) EL 552 31N 10W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 3 (DLP2544) EL 1215 31N 10W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 4 (DLP2545) EL 1092 31N 10W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 5 (DLP2546) EL 1893 31N 10W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 6 (DLP2547) EL 1477 31N 10W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 7 (DLP2548) EL 1754 31N 11W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 8 (DLP2549) EL 1248 31N 11W Animas San Juan, NM 9/1/92 Cedar Hill - Aztec 9 (DLP2550) EL 1418 31N 11W Animas La Plata, CO 9/15/92 Basin Crk (WJM001, WJM002, WJM003) EL 1560 34N 10W Animas La Plata, CO 9/15/92 La Posta Canyon (WJM007, WJM008) EL 2700 33N 10W Animas La Plata, CO 9/15/92 Weaselskin Bridge (WJM004, WJM005, WJM006) EL 2100 34N 10W Animas La Plata, CO 9/16/92 Bondad Bridge (WJM009, WJM010, WJM011) EL 1860 33N 10W Animas La Plata, CO 11/17/1993 32nd St. bridge to 9th St. bridge, Durango CDOW BOAT EL 35N 9W Animas La Plata, CO 11/18/1993 4 Corners Marine to Hwy 160 "high bridge" CDOW BOAT EL 35N 9W Animas La Plata, CO 08/23/1994 Dairy plant luanch near Purple Cliffs CO - 4 BOAT EL 34N 9W Animas La Plata, CO 08/24/1994 3/4 mi. N of La Posta to 1/4 mi. S CO - 2 BOAT EL 33N 10W Animas La Plata, CO 08/24/1994 S of Basin Cr. to N of Weaselskin brdg CO - 3 BOAT EL 34N 10-9W Animas San Juan, NM 08/25/1994 1.7 road mi. South from stateline NM - 6 BOAT EL 32N 10W Animas La Plata, CO 08/25/1994 Abuts on CO-1 to 3/4 mi. N of stateline Chub #1 BOAT EL 32N 9W Animas La Plata, CO 08/25/1994 USGS guage N of Twin Crossing CO - 1 BOAT EL 32N 9-10W Animas La Plata, CO 08/25/1994 3/4 mi. up of Bondad Brdg to USGS guage Chub #2 BOAT EL 33-32N 9-10W Animas San Juan, NM 08/26/1994 Begin down of big bend near Hwy 550 NM - 4 BOAT EL 31N 10W Animas San Juan, NM 08/26/1994 Begin at aquaduct upstrm of Ceder Hill NM - 5 BOAT EL 31N 10W Animas San Juan, NM 08/27/1994 Miller St. bridge to H2O trtmnt plant NM - 1 BOAT EL 29N 13W Animas San Juan, NM 08/27/1994 Midway between Aztec & Flora Vista NM - 2 BOAT EL 30N 12W Animas San Juan, NM 08/27/1994 3 mi. upstream of Hwy 550 bridge NM - 3 BOAT EL 31N 11W Animas La Plata, CO 08/29/1994 S of Basin Cr. to N of Weaselskin brdg CO - 3 BOAT EL 34N 10-9W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 19Table A-6 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1990 - Present). 

River County Sample Date Site Sample # Method Time Area Township Range 

Animas La Plata, CO 08/29/1994 Dairy plant luanch near Purple Cliffs CO - 4 BOAT EL 34N 9W Animas La Plata, CO 08/30/1994 Twin Crossing up from railroad bridge NET - 1 3/4" Trammel net 32N 10W Animas La Plata, CO 08/30/1994 USGS Gauging Station NET - 2 3/4" Trammel net 32N 9W Animas La Plata, CO 08/30/1994 1/4 mi. down from Florida confluence NET - 3 3/4" Trammel net 32N 9W Animas La Plata, CO 08/30/1994 200 yds down from Florida confluence NET - 4 3/4" Trammel net 32N 9W Animas La Plata, CO 08/30/1994 At chub #2 launch site NET - 5 3/4" Trammel net 32N 10W Animas La Plata, CO 08/30/1994 3/4 mi. N of La Posta to 1/4 mi. S CO - 2 BOAT EL 33N 10W Animas San Juan, NM 08/31/1994 1.7 road mi. South from stateline NM - 6 BOAT EL 32N 10W Animas La Plata, CO 08/31/1994 Abuts on CO-1 to 3/4 mi. N of stateline Chub #1 BOAT EL 32N 9W Animas La Plata, CO 08/31/1994 USGS guage N of Twin Crossing CO - 1 BOAT EL 32N 9-10W Animas La Plata, CO 08/31/1994 3/4 mi. up of Bondad Brdg to USGS guage Chub #2 BOAT EL 33-32N 9-10W Animas La Plata, CO 09/1994 Gateway Park to Hwy 160 CO - 5 BOAT EL 35N 9W Animas San Juan, NM 09/01/1994 Midway between Aztec & Flora Vista NM - 2 BOAT EL 30N 12W Animas San Juan, NM 09/01/1994 3 mi. upstream of Hwy 550 bridge NM - 3 BOAT EL 31N 11W Animas San Juan, NM 09/01/1994 Begin down of big bend near Hwy 550 NM - 4 BOAT EL 31N 10W Animas San Juan, NM 09/01/1994 Begin at aquaduct upstrm of Ceder Hill NM - 5 BOAT EL 31N 10W Animas La Plata, CO 09/07/1994 32nd St. bridge to 9th St. bridge, Durango CDOW BOAT EL 35N 9W Animas La Plata, CO 07/30/1996 West bank upstream of Basin Creek CDOW 3F EL Animas La Plata, CO 07/30/1996 Below K-Mart parking lot CDOW 4F EL Animas La Plata, CO 07/30/1996 Riffle behind Durango High School CDOW 5F EL Animas La Plata, CO 07/31/1996 1/4 mi. above High Flume Canyon CDOW 1F EL 37N 10W Animas La Plata, CO 07/31/1996 West bank upstream of Weaselskin Bridge CDOW 2F EL Animas La Plata, CO 09/1996 Gateway Park to Hwy 160 CO - 5 BOAT EL 35N 9W Animas La Plata, CO 09/16/1996 32nd St. bridge to 9th St. bridge, Durango CDOW BOAT EL 35N 9W Animas La Plata, CO 07/16/1997 West bank upstream of Basin Creek CDOW 3F EL Animas La Plata, CO 07/15/1997 Below K-Mart parking lot CDOW 4F EL Animas La Plata, CO 07/15/1997 Riffle behind Durango High School CDOW 5F EL Animas La Plata, CO 07/16/1997 1/4 mi. above High Flume Canyon CDOW 1F EL 37N 10W Animas La Plata, CO 07/16/1997 West bank upstream of Weaselskin Bridge CDOW 2F EL Animas La Plata, CO 08/1997 Reach 1-Purple cliffs to Basin Creek S. Whiteman EL Animas La Plata, CO 08/1997 Reach 2-Basin Creek to Weaselskin Bridge S. Whiteman EL Animas La Plata, CO 08/1997 Reach 3-Weasleskin Bridge to Bondad S. Whiteman EL Animas La Plata, CO 07/16/1998 West bank upstream of Basin Creek CDOW 3F EL Animas La Plata, CO 07/16/1998 Below K-Mart parking lot CDOW 4F EL Animas La Plata, CO 07/17/1998 Riffle behind Durango High School CDOW 5F EL Animas La Plata, CO 07/16/1998 1/4 mi. above High Flume Canyon CDOW 1F EL 37N 10W Animas La Plata, CO 07/16/1998 West bank upstream of Weaselskin Bridge CDOW 2F EL Animas La Plata, CO 09/1998 Gateway Park to Hwy 160 CO - 5 BOAT EL 35N 9W Animas La Plata, CO 09/08/1998 32nd St. bridge to 9th St. bridge, Durango CDOW BOAT EL 35N 9W Animas La Plata, CO 09/21/1998 RM 48.4-49.0 Sample 98ANI18 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 49.0-49.4 Sample 98ANI17 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 49.4-49.8 Sample 98ANI16 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 49.8-50.1 Sample 98ANI15 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 50.1-50.7 Sample 98ANI14 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 50.7-51.1 Sample 98ANI13 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 51.1-51.5 Sample 98ANI12 S. Whiteman BOAT EL 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 20Table A-6 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1990 - Present). 

River County Sample Date Site Sample # Method Time Area Township Range 

Animas La Plata, CO 09/21/1998 RM 51.5-52.3 Sample 98ANI11 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 52.3-52.7 Sample 98ANI10 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 52.7-53.1 Sample 98ANI09 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 53.1-53.7 Sample 98ANI08 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 53.7-54.0 Sample 98ANI07 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 54.0-54.6 Sample 98ANI06 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 54.6-55.0 Sample 98ANI05 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 55.0-55.5 Sample 98ANI04 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 55.5-55.8 Sample 98ANI03 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 55.8-56.2 Sample 98ANI02 S. Whiteman BOAT EL Animas La Plata, CO 09/21/1998 RM 56.2-57.0 Sample 98ANI01 S. Whiteman BOAT EL Cherry Crk. La Plata, CO 02/04/1992 Lamour Ranch BOR #3 EL Florida La Plata, CO 07/29/1990 0.6 mi. above Animas R. Confl. FLC 1 33N 9W Florida La Plata, CO 07/29/1990 20.7 mi. abv Animas R. -Lunt Ranch FLC 2 34N 8W Florida La Plata, CO 1991 0.6 mi. above Animas R. Confl. FLC 1 33N 9W Florida La Plata, CO 1991 20.7 mi. abv Animas R. -Lunt Ranch FLC 2 34N 8W Florida La Plata, CO 7/15/92 Salt Crk Confluence (MRB0057) EL 33N 9W Florida La Plata, CO 08/07/1992 3/4 mi. above Animas R. Confl. BREC 1 EL 33N 9W Florida La Plata, CO 9/16/92 Bondad Hill (WJM012) EL 1500 33N 9W Florida La Plata, CO 9/17/92 Airport Road (WJM019) EL 900 34N 8W Florida La Plata, CO 9/17/92 Gasplant (WJM018) EL 540 33N 9W Florida La Plata, CO 08/24/1993 Paxton Ranch WJM EL 1200 33N 9W Florida La Plata, CO 08/24/1993 Short Ranch WJM EL 1980 33N 9W Florida La Plata, CO 03/31/1994 Paxton's: E of Hwy 550 at Bondad Hill WJM Florida 1 EL 33N 9W Florida La Plata, CO 03/31/1994 Short's: up from Sunny Side School Brdg WJM Florida 2 EL 33N 9W Florida La Plata, CO 07/15/1994 Immediately downstream of 'Florida 1' WJM 1-1 EL Florida La Plata, CO 07/15/1994 Paxton's: E of Hwy 550 at Bondad Hill WJM Florida 1 EL 33N 9W Florida La Plata, CO 07/16/1994 Short's: up from Sunny Side School Brdg WJM Florida 2 EL 33N 9W Florida La Plata, CO 07/16/1994 Short's: immediately up from 'Florida 2' WJM Florida 2+1 EL Florida La Plata, CO 09/09/1994 Immediately downstream of 'Florida 1' WJM 1-1 EL Florida La Plata, CO 09/09/1994 Paxton's: E of Hwy 550 at Bondad Hill WJM Florida 1 EL 33N 9W Florida La Plata, CO 09/12/1994 Short's: up from Sunny Side School Brdg WJM Florida 2 EL 33N 9W Florida La Plata, CO 09/12/1994 Short's: immediately up from 'Florida 2' WJM Florida 2+1 EL La Plata La Plata, CO 02/04/1992 Hesperus-dwnstm of bigstick divers. BREC #2 EL 35N 11W La Plata La Plata, CO 02/05/1992 1 mi. below Mormon Reservoir BREC #4 EL 34N 12W La Plata La Plata, CO 02/05/1992 Bridge - 1/4 mi. N. of Stateline BREC #5 EL 32N 13W La Plata San Juan, NM 02/05/1992 1 mi S of Jackson lk, 0.5 mi E of hwy 170 BREC #7 EL 30N 13W La Plata San Juan, NM 02/05/1992 1.5 mi. S. La Plata, 1 mi. E. HWY 170 BREC #6 EL 31N 13W La Plata La Plata, CO 02/06/1992 1/4 mi. below Long Hollow Crk Confl. BREC #8 EL 32N 13W La Plata La Plata, CO 02/06/1992 Cherry Crk Confluence, Downstream BREC #10 EL 33N 12W La Plata San Juan, NM 04/29/1992 0.5 - 1.5 mi. S. of NM - CO stateline NMGF EL 32N 13W La Plata San Juan, NM 04/30/1992 0.5 - 1.5 mi. S. of NM - CO stateline NMGF EL 1884 32N 13W La Plata San Juan, NM 09/02/1992 0.5 - 1.5 mi. S. of NM - CO stateline NMGF EL 7034 32N 13W La Plata San Juan, NM 9/2/92 DLP2554 (DLP2554) EL 2289 32N 13W La Plata San Juan, NM 9/2/92 DLP2555 (DLP2555) EL 5601 32N 13W La Plata San Juan, NM 9/2/92 DLP2556 (DLP2556) EL 11879 32N 13W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 21Table A-6 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1990 - Present). 

River County Sample Date Site Sample # Method Time Area Township Range 

La Plata La Plata, CO 9/16/92 Below Long Hollow Crk (WJM013, WJM014) EL 900 33N 12W La Plata La Plata, CO 9/17/92 Cherry Crk (WJM015, WJM016) EL 360 33N 13W La Plata La Plata, CO 9/17/92 County Rd 119 (WJM017) SE 43.94 34N 12W La Plata La Plata, CO 9/17/92 County Rd 122 (WJM020) Too low to sample 34N 12W La Plata La Plata, CO 08/23/1993 Lower Section SU1 WJM EL 710 33N 12W La Plata La Plata, CO 08/25/1993 Southern Ute #1 WJM EL 900 33N 12W La Plata La Plata, CO 08/25/1993 Southern Ute #2 WJM EL 1200 33N 12W La Plata La Plata, CO 08/25/1993 Southern Ute #3 WJM EL 1800 33N 12W La Plata La Plata, CO 08/25/1993 Southern Ute #4 WJM EL 1200 33N 12W La Plata La Plata, CO 10/25/1993 Van C. Smith's – 1 BREC - STN #1 EL 32N 13W La Plata La Plata, CO 10/26/1993 Jerry Baird's – 6 BREC - DS of E. Thompson's EL 2045 32N 13W La Plata La Plata, CO 10/26/1993 Van C. Smith's – 2 BREC - STN #2 EL 32N 13W La Plata La Plata, CO 10/26/1993 Van C. Smith's – 3 BREC - STN #3 EL 1970 32N 13W La Plata La Plata, CO 10/26/1993 Van C. Smith's – 4 BREC - STN #4 EL 277 32N 13W La Plata La Plata, CO 10/27/1993 Elmer Thompson's BREC - STN #5 EL 2572 32N 13W La Plata La Plata, CO 10/27/1993 Jerry Baird's – 2 BREC - STN #6 EL 32N 13W La Plata La Plata, CO 10/27/1993 Jerry Baird's – 3 BREC - STN #7 EL 4595 32N 13W La Plata La Plata, CO 10/28/1993 Jerry Baird's – 5 BREC - STN #9 EL 510 32N 13W La Plata La Plata, CO 10/28/1993 Jerry Baird's – 1 BREC - STN #10 EL 2637 32N 13W La Plata La Plata, CO 10/28/1993 Jerry Baird's – 4 BREC - STN #8 EL 32N 13W La Plata La Plata, CO 10/29/1993 Conrad W. Huntington's #1 BREC - J. Huntington's EL 32N 13W La Plata La Plata, CO 10/29/1993 Conrad W. Huntington's #2 BREC - STN #11 EL 32N 13W La Plata La Plata, CO 10/29/1993 Conrad W. Huntington's #3 BREC - STN #12 EL 32N 13W La Plata La Plata, CO 11/29/1993 Long Hollow Crk Confl, Downstream WJM EL 2700 32N 13W La Plata La Plata, CO 11/29/1993 Long Hollow Crk Confl, Upstream WJM EL 2400 33N 12W La Plata San Juan, NM 11/30/1993 1.5 mi. S. of NM - CO stateline WJM EL 2057 32N 13W La Plata San Juan, NM 11/30/1993 1/4 mi. S. of NM - CO stateline WJM EL 2400 32N 13W La Plata San Juan, NM 03/28/1994 New mexico: 2 mi. S of stateline WJM La Plata 1 EL 32N 13W La Plata San Juan, NM 03/28/1994 Site 2: N. M., 0.9 mi. N of Hwy140 brdg WJM La Plata 2 EL 32N 13W La Plata La Plata, CO 03/29/1994 Site 3 (Baird's): 1mi. N of stateline on Hwy 140 WJM La Plata 3 EL 32N 13W La Plata La Plata, CO 03/29/1994 3a-K: Immediately upstream of 'site 3' WJM La Plata 3a-K EL 32N 13W La Plata La Plata, CO 03/30/1994 Immediately upstream of 'site 3a-K' WJM La Plata 3b EL 32N 13W La Plata La Plata, CO 04/01/1994 Up to Long Hollow confluence WJM La Plata 4 EL 32N 13W La Plata La Plata, CO 04/01/1994 Huntington's: co. rd. 100 E to prvt land WJM La Plata 6 EL 33N 13W La Plata La Plata, CO 04/02/1994 Southern Ute land-east from Red Mesa WJM La Plata 5 EL 33N 12W La Plata La Plata, CO 07/13/1994 Immediately downstream of 'site 3' WJM La Plata 3-1 EL La Plata La Plata, CO 07/14/1994 Site 3 (Baird's): 1mi. N of stateline on Hwy 140 WJM La Plata 3 EL 32N 13W La Plata San Juan, NM 07/21/1994 New mexico: 2 mi. S of stateline WJM La Plata 1 EL 32N 13W La Plata San Juan, NM 07/22/1994 Immediately downstream of 'site 2' WJM La Plata 2-1 EL La Plata San Juan, NM 07/22/1994 Site 2: N. M., 0.9 mi. N of Hwy140 brdg WJM La Plata 2 EL 32N 13W La Plata San Juan, NM 07/22/1994 Immediately upstream of 'site 2' WJM La Plata 2+1 EL La Plata La Plata, CO 07/25/1994 Immediately upstream of 'site 3' WJM La Plata 3+1 EL 32N 13W La Plata La Plata, CO 07/26/1994 Southern Ute land-east from Red Mesa WJM La Plata 5 EL 33N 12W La Plata La Plata, CO 07/27/1994 Up to Long Hollow confluence WJM La Plata 4 EL 32N 13W La Plata La Plata, CO 07/27/1994 Huntington's: co. rd. 100 E to prvt land WJM La Plata 6 EL 33N 13W La Plata La Plata, CO 09/13/1994 Southern Ute land-east from Red Mesa WJM La Plata 5 EL 33N 12W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 22Table A-6 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1990 - Present). 

River County Sample Date Site Sample # Method Time Area Township Range 

La Plata San Juan, NM 09/14/1994 New Mexico: 2 mi. S of stateline WJM La Plata 1 EL 32N 13W La Plata La Plata, CO 09/14/1994 Huntington's: co. rd. 100 E to prvt land WJM La Plata 6 EL 33N 13W La Plata San Juan, NM 09/15/1994 Immediately downstream of 'site 2' WJM La Plata 2-1 EL La Plata San Juan, NM 09/15/1994 Site 2: N. M., 0.9 mi. N of Hwy140 brdg WJM La Plata 2 EL 32N 13W La Plata San Juan, NM 09/15/1994 Immediately upstream of 'site 2' WJM La Plata 2+1 EL La Plata La Plata, CO 09/16/1994 Immediately downstream of 'site 3' WJM La Plata 3-1 EL La Plata La Plata, CO 09/19/1994 Site 3 (Baird's): 1mi. N of stateline on Hwy 140 WJM La Plata 3 EL 32N 13W La Plata La Plata, CO 09/19/1994 Immediately upstream of 'site 3' WJM La Plata 3+1 EL 32N 13W La Plata La Plata, CO 09/21/1994 Up to Long Hollow confluence WJM La Plata 4 EL 32N 13W La Plata La Plata, CO 11/21/1997 Cherry Creek confluence to stateline K. Lashmett 035 La Plata La Plata, CO 11/19/1998 RM 26.0-26.4 Sample 98LAP26-30 S. Whiteman La Plata La Plata, CO 11/19/1998 RM 26.4-26.5 Sample 98LAP31 S. Whiteman La Plata La Plata, CO 11/17/1998 RM 29.7-30.0 Sample 98LAP09-14 S. Whiteman La Plata La Plata, CO 11/17/1998 RM 30.0-30.2 Sample 98LAP15-16 S. Whiteman La Plata La Plata, CO 11/18/1998 RM 31.5-31.8 Sample 98LAP17-19 S. Whiteman La Plata La Plata, CO 11/18/1998 RM 31.8-32.2 Sample 98LAP20-25 S. Whiteman La Plata La Plata, CO 11/16/1998 RM 37.3-37.5 Sample 98LAP01-04 S. Whiteman La Plata La Plata, CO 11/16/1998 RM 37.5-37.8 Sample 98LAP05-08 S. Whiteman Long Hollow La Plata, CO 09/06/1992 1/4 mi. upstream from La Plata Confluence BOR #9 EL 33N 12W Long Hollow La Plata, CO 09/06/1992 3 mi. from La Plata at road xing (rd 122?). BOR #11 EL Mancos Montezuma, CO 08/20/1990 2 mi. N. of MV Natl. Park USFWS -A EL 35N 14W Mancos Montezuma, CO 08/20/1990 N. Boundary MV Natl. Park USFWS -C EL 35N 14W Mancos Montezuma, CO 08/21/1990 Above S. bdry MV Natl. Park USFWS -B EL 34N 14W Mancos Montezuma, CO 08/22/1990 1/8 mi. below hwy 160 bridge USFWS - f EL 36N 13W Mancos Montezuma, CO 08/22/1990 H Road Bridge USFWS -D EL 35N 13W Mancos Montezuma, CO 08/23/1990 0.5 mi. S of MV Natl. Park USFWS -K EL 34N 14W Mancos Montezuma, CO 08/23/1990 S. boundary MV Natl. Park USFWS -J EL 34N 14W Mancos Montezuma, CO 08/23/1990 Upstream of Trail Canyon USFWS -L EL 34N 14W Mancos Montezuma, CO 03/22/1994 (UTUM) Down of Johnson Canyon confl. WJM MANCOS 5 EL 33N 15W Mancos Montezuma, CO 03/22/1994 (UTUM) Up of Johnson Canyon confl. WJM MANCOS 6 EL 33N 15W Mancos Montezuma, CO 03/23/1994 (UMUT) Site 3: Up from guage Hwy 666 WJM MANCOS 3 EL 32N 17W Mancos Montezuma, CO 03/23/1994 (UMUT) At Moqui Canyon Confluence WJM MANCOS 4 EL 33N 16W Mancos Montezuma, CO 03/24/1994 Ute Mtn Ute land at CO-NM stateline WJM MANCOS 1 EL 32N 19W Mancos Montezuma, CO 03/24/1994 (UMUT) Mancos R.-Navajo Wash confl. WJM MANCOS 2 EL 32N 18W Mancos Montezuma, CO 07/18/1994 (UTUM) Down of Johnson Canyon confl. WJM MANCOS 5 EL 33N 15W Mancos Montezuma, CO 07/18/1994 (UTUM) Up of Johnson Canyon confl. WJM MANCOS 6 EL 33N 15W Mancos Montezuma, CO 07/19/1994 Immediately downstream of 'site 3' WJM MANCOS 3-1 EL Mancos Montezuma, CO 07/19/1994 (UMUT) Site 3: Up from guage Hwy 666 WJM MANCOS 3 EL 32N 17W Mancos Montezuma, CO 07/19/1994 (UMUT) At Moqui Canyon Confluence WJM MANCOS 4 EL 33N 16W Mancos Montezuma, CO 07/20/1994 Ute Mtn Ute land at CO-NM stateline WJM MANCOS 1 EL 32N 19W Mancos Montezuma, CO 07/20/1994 (UMUT) Mancos R.-Navajo Wash confl. WJM MANCOS 2 EL 32N 18W Mancos Montezuma, CO 09/07/1994 Ute Mtn Ute land at CO-NM stateline WJM MANCOS 1 EL 32N 19W Mancos Montezuma, CO 09/07/1994 (UMUT) Mancos R.-Navajo Wash confl. WJM MANCOS 2 EL 32N 18W Mancos Montezuma, CO 09/07/1994 Immediately downstream of 'site 3' WJM MANCOS 3-1 EL Mancos Montezuma, CO 09/07/1994 (UMUT) Site 3: Up from guage Hwy 666 WJM MANCOS 3 EL 32N 17W Mancos Montezuma, CO 09/08/1994 (UMUT) At Moqui Canyon Confluence WJM MANCOS 4 EL 33N 16W 
SJR Final Tributary Report January 31, 2000 

Miller Ecological Consultants, Inc. Appendix Page 23Table A-6 (continued). Site location descriptions for sites downstream of Navajo Reservoir (1990 - Present). 

River County Sample Date Site Sample # Method Time Area Township Range 

Mancos Montezuma, CO 09/08/1994 (UTUM) Down of Johnson Canyon confl. WJM MANCOS 5 EL 33N 15W Mancos Montezuma, CO 09/08/1994 (UTUM) Up of Johnson Canyon confl. WJM MANCOS 6 EL 33N 15W McElmo Montezuma, CO 05/10/1994 8.5 mi. up from stateline CDOW - STN #2 EL 35N 19W McElmo Montezuma, CO 05/10/1994 1/4 mi. E. of Ismay trading Post CDOW - STN #1 EL 35N 20W McElmo Montezuma, CO 05/11/1994 S. Oak Street, Cortez CDOW - STN #4 EL 35N 16W McElmo Montezuma, CO 05/11/1994 Bridge at County Road J CDOW - STN #3 EL 36N 17W