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

Biological
Operation and Reclamation Non-Discretion Reclamation Discretion Assessment
Maintenance Activity Reference
(Pages)
flow-rate below (1) daily & seasonal fluctuations (1) allowed to renegotiate 29-34, 72-
Hoover Dam due to supplying downstream water downstream water contracts 73
orders (2) allowed to request Sec'y of
(2) hourly fluctuations in releases Energy to renegotiate
from Hoover Dam responding to hydropower contracts with
instantaneous demands for electric service customers, or
hydropower; hydropower contracts (3) seek voluntary mgmt
administered by Sec 'y of Energy alternatives for (1) and (2)
above
water releases from (1) daily and seasonal fluctuations (1) limited discretion due to 29-31, 72-
Davis Dam due to supplying downstream water stabilized elevations of Lake 73
orders Havasu
(2) hourly fluctuations in releases (2) allowed to renegotiate
from Davis Dam due to downstream water contracts
hydropower contracts; hydropower (3) allowed to request Sec'y of
contracts administered by Sec'y of Energy to renegotiate
Energy hydropower contracts with
electric service customers, or
(4) seek voluntary
modifications to (2) and (3)
above
water releases from (1) seasonal fluctuations in flows (1) allowed to renegotiate
Parker Dam due to varying irrigation demands downstream water contracts 29-31, 72-
(2) hourly fluctuations in releases (2) allowed to request Sec'y of 73
from Parker Dam due to Energy to renegotiate
hydropower generation; hydropower contracts with
hydropower contracts administered electric service customers, or
by Sec'y of Energy (3) seek voluntary mgmt
changes to (1) and (2)above
controlling flow-rate (1) required to meet Mexico's (1) limited discretion in flows 27-28, 72
below Imperial Dam irrigation demands within Int'l by-passing Laguna Division via
Treaty requirements Pilot Knob and Calif.
Wasteway at Siphon Drop
controlling flow-rate (1) water diverted by Mexico for (1) no discretion 19,72
below Morelos Dam irrigation
declaring surplus, (1) rights to surplus water (1) limited discretion over 26-27
normal, and shortage delineated in decree, contracts, and contracts using surplus water
years other obligations and unused apportionment

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