9542

• UCREFRP Catalog Number: 9542
• Author: Upper Colorado River Commission.
• Title: Fifty-Sixth Annual Report of the Upper Colorado River Commission.
• USFW Year: 2004.
• USFW - Doc Type: Salt Lake City, UT.
• Copyright Material: NO

P rog ressive
Years Year Estimated Average Average 10-year
to Ending Virgin to Since Moving
2004 Se t. 3 Flow 2004 1896 Avera e
50 1955 9.2 14.1 15.3 13.1 -5.6
49 1956 10.7 14.2 15.2 13.1 -4.2
48 1957 20.1 14.3 15.3 13.6 5.2
47 1958 16.5 14.1 15.3 13.6 1.6
46 1959 8.6 14.1 15.2 12.9 -6.3
45 1960 11.3 14.2 15.1 12.7 -3.6
44 1961 8.5 14.3 15.0 12.2 -6.4
43 1962 17.3 14.4 15.0 12.1 2.4
42 1963 8.4 14.3 15.0 11.8 -6.5
41 1964 10.2 14.5 14.9 12.1 -4.7
40 1965 18.9 14.6 14.9 13.1 4.0
39 1966 11.2 14.5 14.9 13.1 -3.7
38 1967 11.9 14.6 14.8 12.3 -3.0
37 1968 13.7 14.6 14.8 12.0 -1.2
36 1969 14.4 14.7 14.8 12.6 -0.5
35 1970 15.4 14.7 14.8 13.0 0.5
34 1971 15.1 14.6 14.8 13.7 0.2
33 1972 12.2 14.8 14.8 13.1 -2.7
32 1973 19.4 14.7 14.9 14.2 4.5
31 1974 13.3 14.6 14.8 14.6 -1.6
30 1975 16.6 14.6 14.9 14.3 1.7
29 1976 11.6 14.5 14.8 14.4 -3.3
28 1977 5.8 14.6 14.7 13.8 -9.1
27 1978 15.2 15.0 14.7 13.9 0.3
26 1979 17.9 15.0 14.8 14.3 3.0
25 1980 17.5 14.8 14.8 14.5 2.6
24 1981 8.2 14.7 14.7 13.8 -6.7
23 1982 16.2 15.0 14.7 14.2 1.3
22 1983 24.0 15.0 14.8 14.6 9.1
21 1984 24.5 14.5 14.9 15.8 9.6
20 1985 20.8 14.0 15.0 16.2 5.9
19 1986 21.9 13.7 15.1 17.2 7.0
18 1987 16.9 13.2 15.1 18.3 2.0
17 1988 11.8 13.0 15.1 18.0 -3.1
16 1989 10.1 13.1 15.0 17.2 -4.8
15 1990 9.0 13.3 15.0 16.3 -5.9
14 1991 12.3 13.6 14.9 16.8 -2.6
13 1992 11.0 13.7 14.9 16.2 -3.9
12 1993 18.0 13.9 14.9 15.6 3.1
11 1994 10.5 13.5 14.9 14.2 -4.4
10 1995 20.1 13.8 14.9 14.2 5.2
9 1996 14.3 13.1 14.9 13.4 -0.6
8 1997 21.0 13.0 15.0 13.8 6.1
7 1998 16.9 11.8 15.0 14.3 2.0
6 1999 16.4 11.0 15.0 15.0 1.5
5 2000 10.9 9.9 15.0 15.1 -4.0
4 2001 11.0 9.6 14.9 15.0 -3.9
3 2002 6.4 9.2 14.9 14.6 -8.5
2 2003 11.1 10.6 14.8 13.9 -3.7
1 2004 10.0 10.0 14.8 13.9 -39
Maximum 24.5 18.8 9.6
Minimum 5.6 11.8 -9.3
Average 14.8 12.1 0.0

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