WSP01819

• File Number: 8210.140.20.A
• Description: Colorado River Basin Organizations/Entities - CRBSF - Colorado River Board of California
• Date: 3/28/2001
• Author: CRBC
• Title: Colorado River Water Report
• Water Supply Pro - Doc Type: Report/Study

,
'I

001248

.

..

)

]\Pril 4, 2001 Forecast of Colorado River F1CM into
Lake Powel~ (1) (Million Acre-feet)

USBR and National Weather Service
]\Pril-Julv Water Year 2001

Change Fran Last
Jllbnth's Forecast
]\Pril-Julv Wat Yr 2001

Maximum (2)

8,600

11.954

-0.700

-0,855

Mean

5.800 *

8.854 **

-0,200

-0,255

Minimum (2)

3.300

5.954

+0,100

+0,045

* nus rronth's A-J forecast is 75% of 30-year i\,-J average sho<m belCM,
** nus Tl'Ollth's WY forecast is 76% of 30-year WY average shown belCM.

Camarison with past records
of Colorado River
inflCM into Lake Powell
(at Lee Ferry prior to 1962)

April-Julv F1CM Water Year F1CM
L::mg-TilTE Average (1922-2000) 8.018 11.869
30-yr . Average (1961-90) 7.735 11.724
10-yr, Average (1991-2000) 7,434 11.403
Max, of Record 15.404 (1984) 21. 873 (1984)
Min. of Re=rd 1. 286 (1977) 3,663 (1977)
Last Year (2000) 4,352 7.310

(1) under conditions of no other Upper Basin reservoirs,

(2) USER and NWS forecasts indicate the probability of 19 chances out of
20 that the actual flow will not exceed the maximum value, and will not be
less than the minimum value,

-5-