WSP05781

• File Number: 8200.750
• Description: San Juan River General
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 4/1/1994
• Author: Robin Abell
• Title: San Juan River Basin - Water Quality and Contaminants Review - Volume I - April 1994
• Water Supply Pro - Doc Type: Report/Study

I
anz;s:s

FIGURES

1. The San Juan River basin . . . . . . . . . . . . 2
2. The San Juan River and major tributaries. . 3
3. Geologic structure of the San Juan basin 4
4. San Juan basin petroleum fields. . . . . . 6
5. San Juan basin coal deposits. . . . . . . . 7
6. Population in the San Juan basin above Shiprock, 1860-1970 . . . . . . 8
7. Location of DOl-sponsored irrigation projects, San Juan basin . . . . . . . . . 9
8a. Collection records of round tail chub in the San Juan River, New Mexico and Utah,

1987-1989 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
8b. Collection records of razorback sucker in the San Juan River, New Mexico and Utah,

1987-1989 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
8c. Collection records of Colorado squawfish in the San Juan River, New Mexico and Utah,

1987-1989 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
9. Location of diseased fish collected from the Animas River, 1992 . . . . . . .18
10. Lake Powell sample sites, U.S. Fish and Wildlife Service study, 1991-1992 .82
11. Stages of arroyo evolution. . . . . . . . . . . . . . . . . . . . . . . . . . . .91
12a. Relation between annual suspended sediment load and annual runoff for Animas
River at Fannington, New Mexico . . . . . . . . . . . . . . . . . . . . . . . . .92
12b. Annual suspended sediment concentrations through time for the Animas River
at Farmington, New Mexico. . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
13a. Annual stream discharge, San Juan River near Bluff, Utah, water years 1930-1980. .93
13b. Annual suspended sediment load, San Juan River near Bluff, Utah, water years

1930-1980 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
14. Major exposures of Mancos Shale and equivalent rocks in the Upper Colorado
River basin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
15. Distribution of major cations and anions at selected stations in the San Juan
River basin, 1975 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
16. Analyses of water from selected streams in the San Juan River basin and from
alluvium nearby . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
17. Approximate weighted-average concentration of dissolved solids of streams in the
San Juan River basin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
18. Mean total dissolved solids and conductivity, 1973, at USGS sampling stations . . . 101
19. Approximate dissolved-solids discharge and streamflow expressed as percentages of
the dissolved-solids discharge and streamflow of the San Juan River near Bluff, Utah . 102
20. Location of 1993 USGS study area and approximate location of irrigation projects. . . 105
21. Major existing sources of potential groundwater contamination in New Mexico. . . . . 112
22. Relative vulnerability of New Mexico aquifers to contanrination from surface discharges . 113
23. Location of USGS Aneth groundwater study. . . . . . . . . . . 117
24. Location of USGS Animas River Valley groundwater study. . . . . . . . . . 118
25. O'Brien (1987) study area and collection sites . . . . . . . . . . . . . . . . . 120
26. Water quality, bottom sediment, and biota sampling sites on or adjacent to
DOl-sponsored irrigation projects, San Juan DOl reconnaissance investigation. . . . . 152
27. Water quality and bottom sediment sampling sites and fish sampling reaches of the
San Juan River and at the mouths of tributary streams, San Juan DOl
reconnaissance investigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
28. Concentrations of dissolved selenium in water samples from irrigation project sites,
San Juan DOl reconnaissance investigation. . . . . . . . . . . . . . . . . . . . . . 161
29. Comparison of selenium concentrations in all species of suckers collected for the
NCBP in 1984, and in flannelmouth suckers from the San Juan River in 1990,
San Juan DOl reconnaissance investigation. . . . . . . . . . . . . . . . . . . . . . . . . . . 164

v