WSPC12661

• File Number: 8282.300
• Description: Colorado River Operations and Accounting - Lower Basin Administrative Procedures
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 5/16/1997
• Author: DOI-BOR
• Title: FWS Final Biological and Conference Opinion on Lower Colorado River Operations and Maintenance - Lake Mead to Southerly International Border - Draft for Review - 05-16-97
• Water Supply Pro - Doc Type: Report/Study

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

002981

BIOLOGICAL OPINION

Table of Contents

LIST OF FIGURES AND TABLES

FIGURES

Fig. 1. Detail of the Colorado River description area
Fig. 2. Schematic of water and power uses outside
the lower Colorado River action area
Fig. 3. Lake Havasu operational constraints
Fig. 4. Lake Mohave operational constraints
Fig. 5. Side-view schematic of LCR from Pierce Ferry to SIB
Fig. 6. Typical season flow of Colorado River below Davis Dam
Fig. 7. Typical spring flows on Colorado River below Parker Dam
Fig. 8. Typical summer flows on Colorado River below Parker Dam
Fig. 9. Typical fall flows on Colorado River below Parker Dam
Fig. 10. Typical winter flows on Colorado River below Parker Dam
Fig. 11. Three-Finger Lake Project
Fig. 12. How Reclamation's conservation activities for the bony tail chub,
razorback sucker, and southwestern willow flycatcher fit into
long-term LCR MSCP

5

7
12
13
15
20
21
22
23
24
32

158

TABLES

Table 1. Summary of Reclamation I s discretion over Lower Colorado River
operations and maintenance. 35
Table 2. List of documents known collectively as "The Law of the River" . 9
Table 3. Generalized riparian habitat types occupied by the southwestern
willow flycatcher based on plant species composition and vegetation
structure. 50
Table 4. Nest height and nest substrate height data by riparian habitat type
for the southwestern willow flycatcher. 54
Table 5. Nest predation and brood parasitism rates documented for the
southwestern willow flycatcher across its range. 56
Table 6. Rangewide population status for the southwestern willow flycatcher. 61
Table 7. Agency actions that have undergone section 7 consultation and levels
of incidental take permitted for the southwestern willow flycatcher rangewide. 65
Table 8. Yuma clapper rail census results. 71
Table 9. Reclamation's mitigation responsibilities on the LCR from Davis Dam
to International Boundary with Mexico. 97
Table 10. Results of section searches and monitoring of study plots in the
5-mile zone. 112
Table 11. Non-Federal activities that may affect the resources of the Lower
Colorado River area. 114
Table 12. Amounts and uses of water diverted by entitlement holders. 115