WSP02772

• File Number: 8240.300.31.B
• Description: San Juan River - FWS Flow Recommendations
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 9/16/1998
• Author: Biology Committee
• Title: Flow Recommendations for the San Juan River - Draft Report
• Water Supply Pro - Doc Type: Report/Study

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Figure 2.4. Annual hydrographs for the San Juan River at Four Corners
for 1987 to 1990. ......,.......... , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 18

Figure 2.5. Annual hydrographs for the San Juan River at Four Corners
for 1991 to 1997. ...............,............................... 2 - 19

Figure 2.6. Mean daily water temperature for the San Juan River
at Archuleta, New Mexico, and at Shiprock, New Mexico, during pre-dam
and post-dam conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . 2 - 20

Figure 2.7. Habitat types as a percent of total wetted area (TWA)
for the San Juan River at three flow levels. ........................... 2 - 23

Figure 2,8. The distributions of the major habitat types by geomorphic reach
for a base-flow condition (September 1995). .......................... 2 - 25

Figure 3.1. Back-calculated dates of Ptychocheilus luc/us spawning based on larval
and juvenile specimens collected in the San Juan River, 1987 to 1996, ...... 3 - 5

Figure 4.1. Cross-section surveys of the San Juan River
at River Transect (RT) 01 for the period 1992 to 1997. ....."............ 4 - 6

Figure 4.2. Average relative bed elevation for the 11 River Transects (RTs)
for the research period. ........................................... 4 - 7

Figure 4.3. Average relative bed elevations for the Mixer and Debris Field transects. .... 4 ~ 10

Figure 4.4. Relative bed elevation for two transects in Reach 1. .................... 4 - 10

Figure 4.5. Relationship between main channel flow and island count. ............... 4 - 11

Figure 4.6, Island count in Reaches 3, 4, and 5 at base flow vs. time as a measure
of change in channel complexity. . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . 4 - 12

Figure 4.7. Flow and backwater depths for 1997 runoff forthe Montezuma Creek
and Sand Island sites. ................,.......................... 4 - 24

Figure 4.8. HEC-6 calibration results for Sand Island and Montezuma Creek. . . . . . . . . . . 4 - 25

Figure 4.9. Modeling results with small change in grain size
to demonstrate sensitivity, ........................................ 4 - 26

Figure 4.10 A comparison, by reach and year, of the average water depth
in backwaters of the San Juan River. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 - 35

Figure 4.11. A comparison by reach of the averages in August 1995, 1996, and 1997
for detritus (above), periphytan (middle) and invertebrates (lower)
in the backwaters of the San Juan River. . . . . . . . . . . . . . . . . . , . . . . . . . . . . . 4 - 36

SJRIP Biology Committee
16 September 1998

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Table of Contents
Draft Flow Report