8031

• UCREFRP Catalog Number: 8031
• Author: U.S. Department of the Interior.
• Title: Fish and Wildlife Service Final Biological and Conference Opinion on Lower Colorado River Operations and Maintenance - Lake Mead to Southerly International Boundary.
• USFW Year: 1997.
• USFW - Doc Type: \
• Copyright Material: NO

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BIOLOGICAL OPINION

Proposed Action

Table 1. Summary of Reclamation's discretion over Lower Colorado River operations and
maintenance.

Biological
Operation and Reclamation Non- Discretion Reclamation Discretion Assessment
Maintenance Activity Reference
(Pages)
Lake Mead water (I) amount of yearly upper-basin (I) limited discretion over
elevation runoff timing of releases from Glen 20, 35-42,
(2) flood-control operation, Canyon Dam 49, 56, 72
coordinated with COE (2) allowed to renegotiate
(3) supplying downstream water downstream water contracts
orders
(4) supplying water to Mexico
Lake Mohave (I) hourly fluctuations in releases (I) limited discretion over 29-30, 52,
water elevation from Hoover Dam responding to monthly water elevations 72-73
instantaneous demands for (2) flood-control operation
hydropower (3) allowed to request Sec'y of
(2) hydropower contracts Energy to renegotiate
administered by Sec'y of Energy hydropower contracts with
(3) supplying downstream water electric service customers, or
orders seek voluntary mgmt
alternatives.
Lake Havasu water (I) maintaining elevations high (I) limited discretion to
elevation enough to peniut diversion into CR regulate high, stable reservoir 29-30, 50-
and CAP aqueducts elevations 52, 72-73
(2) supplying downstream water (2) flood-control operation
orders (3) allowed to renegotiate
(3) supplying water to Mexico downstream water contracts
(4) hourly fluctuations in releases (4) allowed to request Sec'y of
from Parker and Davis Dams due Energy to renegotiate
to hydropower contracts; hydropower contracts with
hydropower contracts administered electric service customers, or
by Sec'y of Energy (5) seek voluntary mgmt
alternatives for (3) and (4)
Senator Wash (1) side-channel inflow upstream to (I) no discretion over short-
Reservoir water Parker Dam driven by local term fluctuations, limited 48, 73
elevation precipitation discretion over long-term
(2) change in water orders diverted fluctuations
at Imperial Dam
Mittry Lake water (I) managed cooperatively with (I) limited discretion 19
elevation Ariz. Game and Fish Dept.

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