WSPC02460

• File Number: 8240.300.31.J
• Description: Colorado River Threatened-Endangered Species - Recovery Program - San Juan - Environmental Studies
• State: CO
• Basin: San Juan/Dolores
• Water Division: 5
• Date: 9/1/2000
• Author: Biology Committee
• Title: San Juan River Recovery Implementation Program Biology Committee - Program Evaluation Report - 7 Year Research Period 1991-1997 - 09-01-00
• Water Supply Pro - Doc Type: Report/Study

Table 3.4.

Table 3.5.

Table 3.6.

Table 3.7.

Table 3.8

Table 3.9.

0'01593

Total area (square meters) of low-velocity habitats per mile
in nursery habitat study sections of th" "~an Juan, Green,
and Colorado rivers, Septemb~c 1994; '1997 (Source: Archer
and Crowl 2000b). Flows in the San Juan River were generally
900 to 1,080 cfs in 1994-1996 and varied from 3,100 to 5,260 cfs in 1997. . . 3-29

Average cobble size distribution for potential spawning sites
in the San Juan, Yampa, and Colorado Rivers. Diameters (mm)
represent the maximum size cobbles within the designated percentage
(Source: Bliesner and Lamarra 2000). ..,........,......,.......:,.. 3-31

Total number of deep (>0.5 m), low-velocity habitats
in nursery habitat study sections of the San Juan River for August
and September 1994-1997 (Source: Archer and CrowI2000b). . . , , . . . . . . . 3-32

Six-year review (10/91 to 10/97) of fishery biologists' San Juan River
C. /atipinnis and C. discobo/us abnormality data
(Source: Landye et al. 2000). ..,...........,...................... 3-53

Survival and growth of Colorado pikeminnow larvae produced
by adults exposed to selenium in the diet and water for 154 days prior
to spawning (Source: Buhl and Hamilton 2000). . , . . . . , , . . . . . . . , . . . . . . . 3-56

Number of young-of-the-year (YOY) and juvenile wild
Colorado pikeminnow collected annually from 1987 to 1997
in the San Juan River during monitoring studies (Source: Converse
and Holden 1999). .........................................,..,. 3-58

LIST OF FIGURES

Figure 2.1

Figure 3.1 ,

Figure 3.2.

San Juan River Basin Recovery Implementation Program (SJRIP)
research study area, ...,.........,...,.".........."............ 2-2

Riverwide movements of 13 radiotelemetered adult Colorado pikeminnow
in the San Juan River. 1991 to 1995. Dashed lines indicate the borders
of the "preferred" reach (RM 109.0-142,0) utilized by the majority
of radiotelemetered adult Colorado pikeminnow (Source: Ryden 2000a). . . . , 3-4

Habitat use recorded for radiotelemetered Colorado pikeminnow
in the San Juan River, 1991 to 1995. The total number
of radiotelemetry observations during the specified calendar month
is shown in parentheses (Source: Ryden 2000a).. .................,.... 3-5

~

August 2000

Program Evaluation Report

T-4