WSP04347

• File Number: 8282.600.10
• Description: Colorado River Operating Annual Reports
• Basin: Colorado Mainstem
• Date: 1/1/1977
• Author: USDOI/BOR
• Title: Operation of the Colorado River Basin 1977 Projected Operations 1978
• Water Supply Pro - Doc Type: Publication

Lower Basin Reservoirs

At the beginning of water year 1977. Lake Mead
had a water-surface elevation of 1.179 feet and an
active storage of 20,062,000 acre-feet. During the
water year. releases were made to meet down-
stream water use requirements in the United States
and Mexico, programmed levels of Lakes Mohave
and Havasu. and transit losses which include river
and reservoir evaporation. uses by phreatophytes,
changes in bank storage, unmeasured inflows, and
diversions_ The total release from Lake Mead
through Hoover Dam was 7.562.000 acre-feet. At
the end of the water year. lake Mead had a water-
surface elevation of 1,180 feet and an active stor-
age of 20,205.000 acre-feet, which reflect an in-
crease in storage during the water year of 143,000
acre-feet.

Hoover Dam, Lake Mead

STI\. TISTICS
ACTIVE STORAGE'
RESERVOIR

On September 30,1977. the active storage of lake
Mead was 4,061,000 acre-feet more than the active
storage in lake Powell.

Because adequate space in lake Mead and CRSP
reservoirs was available during water year 1977,
no additional releases at Hoover Dam were re-
quired pursuant to the flood control regulations.
(Chart 8_)

(ACRE. ELEVATION
FEETl (FEEn
MAXIMUM STORAGE 27.377,000 1229
RATED HEAD 13.653,000 1113
M"INIMUM POWER POOL 10.024.000 1083
SURFACE AREA (FULll 162)00 ACRE'i
RESERVDIRLEr-,GTH(FULLI 11SMIlES
POWER PLANT
NUMBER (IF UNITS
TOTAL CAPACITY
OF UhlTS

17

1,::144,800 KILO'....Ans

'does not includt 2.378,OOOlCrt.fHt of dt~d sror.
~IOWft."Ir,on895ftf:r

OUTFLOW

~

10

20

o 0
Z
o 20
u
w
~
;=
w 10
w
~
u
in
o 0
u 20
8
"

10

t ~ ~ ;i
c: Z Q :=;
I

.:0 a:: a: >-
IlJ <l Q. <C
... ~ <( :::i:
WaterVear 1171

g~t)~~~
<( '~I 0 z 0 ....,

ai a: g:' >-
~ ~ ~ i
WillerV.,,",n,

o
o
<

.
~ I

16