Cascade Res — storage

Storage now, against this reservoir's own record

692.92 Mm³

Stored, September 1996

81st

Percentile among 37 Seps on record

-12.3%

Change over the 12 months to 1996-09

Storage in September 1996 was higher than most Seps on record, ranked against 37 other Seps held for this reservoir.

Storage, 1959–1996

Monthly mean storage

441 monthly values, 1959 to 1996

Monthly means of the publisher's daily record. Volume, not percentage of capacity: without a capacity whose definition is stated, fullness cannot be computed.

View the data behind this chart

Underlying data
Period	Cascade Res At Cascade ID (Mm³)
October 1959	599
November 1959	648
December 1959	619
January 1960	594
February 1960	602
March 1960	597
April 1960	685
May 1960	806
June 1960	868
July 1960	800
August 1960	639
September 1960	540
October 1960	441
November 1960	427
December 1960	404
January 1961	344
February 1961	325
March 1961	362
April 1961	418
May 1961	495
June 1961	773
July 1961	745
August 1961	620
September 1961	492
October 1961	409
November 1961	361
December 1961	322
January 1962	273
February 1962	246
March 1962	253
April 1962	315
May 1962	500
June 1962	733
July 1962	814
August 1962	689
September 1962	572
October 1962	569
November 1962	653
December 1962	712
January 1963	707
February 1963	748
March 1963	787
April 1963	810
May 1963	834
June 1963	874
July 1963	848
August 1963	743
September 1963	622
October 1963	526
November 1963	516
December 1963	499
January 1964	470
February 1964	453
March 1964	425
April 1964	449
May 1964	565
June 1964	815
July 1964	850
August 1964	763
September 1964	642
October 1964	544
November 1964	512
December 1964	537
January 1965	618
February 1965	527
March 1965	344
April 1965	340
May 1965	542
June 1965	806
July 1965	865
August 1965	827
September 1965	749
October 1965	665
November 1965	667
December 1965	685
January 1966	693
February 1966	630
March 1966	607
April 1966	651
May 1966	738
June 1966	853
July 1966	772
August 1966	600
September 1966	429
October 1966	328
November 1966	279
December 1966	245
January 1967	198
February 1967	200
March 1967	208
April 1967	259
May 1967	356
June 1967	661
July 1967	847
August 1967	750
September 1967	611
October 1967	515
November 1967	499
December 1967	479
January 1968	454
February 1968	426
March 1968	467
April 1968	516
May 1968	570
June 1968	764
July 1968	774
August 1968	657
September 1968	550
October 1968	449
November 1968	467
December 1968	490
January 1969	494
March 1969	377
April 1969	367
May 1969	583
June 1969	849
July 1969	844
August 1969	731
September 1969	569
October 1969	463
November 1969	430
December 1969	390
January 1970	385
February 1970	440
March 1970	446
April 1970	436
May 1970	517
June 1970	814
July 1970	856
August 1970	762
September 1970	654
October 1970	581
November 1970	568
January 1971	619
February 1971	563
March 1971	480
April 1971	357
May 1971	519
June 1971	815
July 1971	867
August 1971	808
September 1971	700
October 1971	637
November 1971	618
December 1971	582
January 1972	506
February 1972	442
March 1972	387
April 1972	333
May 1972	411
June 1972	764
July 1972	833
August 1972	712
September 1972	610
October 1972	520
November 1972	513
December 1972	514
January 1973	522
February 1973	507
March 1973	507
April 1973	534
May 1973	606
June 1973	740
July 1973	712
August 1973	589
September 1973	416
October 1973	327
November 1973	387
December 1973	461
January 1974	536
February 1974	551
March 1974	420
April 1974	366
May 1974	452
June 1974	753
July 1974	868
August 1974	819
September 1974	712
October 1974	626
November 1974	614
December 1974	575
January 1975	529
February 1975	502
March 1975	467
April 1975	401
May 1975	397
June 1975	602
July 1975	813
August 1975	762
September 1975	674
October 1975	606
November 1975	649
December 1975	686
January 1976	654
February 1976	586
March 1976	498
April 1976	464
May 1976	610
June 1976	823
July 1976	854
August 1976	793
September 1976	688
October 1976	609
November 1976	599
December 1976	579
January 1977	534
February 1977	503
March 1977	507
April 1977	515
May 1977	482
June 1977	490
July 1977	425
August 1977	341
September 1977	276
October 1977	274
November 1977	290
December 1977	338
January 1978	388
February 1978	408
March 1978	426
April 1978	527
May 1978	664
June 1978	814
July 1978	862
August 1978	802
September 1978	727
October 1978	663
November 1978	643
December 1978	600
January 1979	551
February 1979	520
March 1979	499
April 1979	512
May 1979	614
June 1979	760
July 1979	698
August 1979	569
September 1979	436
October 1979	312
November 1979	303
December 1979	326
January 1980	346
March 1980	426
April 1980	483
May 1980	725
June 1980	837
July 1980	853
August 1980	774
September 1980	649
October 1980	577
November 1980	553
December 1980	583
January 1981	636
February 1981	672
March 1981	722
April 1981	781
May 1981	860
June 1981	864
July 1981	828
August 1981	719
September 1981	548
October 1981	492
November 1981	519
December 1981	579
January 1982	628
February 1982	595
March 1982	557
April 1982	463
May 1982	522
June 1982	740
July 1982	855
August 1982	824
September 1982	736
October 1982	653
November 1982	667
December 1982	626
January 1983	563
February 1983	525
March 1983	569
April 1983	538
May 1983	560
June 1983	805
July 1983	848
August 1983	812
September 1983	740
October 1983	654
November 1983	630
December 1983	627
January 1984	571
February 1984	559
March 1984	587
April 1984	586
May 1984	591
June 1984	788
July 1984	825
August 1984	739
September 1984	614
October 1984	531
November 1984	534
December 1984	553
January 1985	552
February 1985	546
March 1985	555
April 1985	611
May 1985	741
June 1985	844
July 1985	806
August 1985	680
September 1985	549
October 1985	503
November 1985	526
December 1985	550
January 1986	564
February 1986	593
March 1986	629
April 1986	600
May 1986	643
June 1986	848
July 1986	853
August 1986	749
September 1986	596
October 1986	545
November 1986	558
December 1986	569
January 1987	574
February 1987	581
March 1987	608
April 1987	652
May 1987	750
June 1987	768
July 1987	720
August 1987	612
September 1987	498
October 1987	440
November 1987	432
December 1987	440
January 1988	445
February 1988	450
March 1988	457
April 1988	504
May 1988	595
June 1988	717
July 1988	704
August 1988	612
September 1988	498
October 1988	463
November 1988	469
December 1988	483
January 1989	493
February 1989	499
March 1989	525
April 1989	601
May 1989	734
June 1989	836
July 1989	806
August 1989	681
September 1989	583
October 1989	546
November 1989	554
December 1989	559
January 1990	572
February 1990	586
March 1990	598
April 1990	666
May 1990	801
June 1990	863
July 1990	838
August 1990	771
September 1990	689
October 1990	621
November 1990	622
December 1990	617
January 1991	581
February 1991	553
March 1991	574
April 1991	604
May 1991	673
June 1991	819
July 1991	817
August 1991	699
September 1991	598
October 1991	547
November 1991	546
December 1991	563
January 1992	542
February 1992	508
March 1992	540
April 1992	589
May 1992	699
June 1992	695
July 1992	649
August 1992	546
September 1992	463
October 1992	456
November 1992	461
December 1992	449
January 1993	424
February 1993	401
March 1993	412
April 1993	505
May 1993	670
June 1993	859
July 1993	835
August 1993	711
September 1993	616
October 1993	560
November 1993	557
December 1993	560
January 1994	565
February 1994	567
March 1994	576
April 1994	612
May 1994	705
June 1994	758
July 1994	671
August 1994	534
September 1994	432
October 1994	409
November 1994	420
December 1994	434
January 1995	451
February 1995	494
March 1995	563
April 1995	654
May 1995	700
June 1995	846
July 1995	866
August 1995	845
September 1995	790
October 1995	765
November 1995	786
December 1995	819
January 1996	745
February 1996	703
March 1996	651
April 1996	629
May 1996	711
June 1996	846
July 1996	852
August 1996	767
September 1996	693

Rate and persistence

-8.08 Mm³

Mean drawdown per month over 12 months

3 of 24

Months in the last two years below the 20th percentile for their own month

Rates are computed only across an unbroken run of months, so a rate is never divided by a period in which some of the change was not observed. Percentile counts compare each month with the same calendar month in every other year held.

Location

Cascade Res At Cascade ID

Gauge location

Where this comes from

441 monthly observations 1959–1996 Mm³

Spatially aggregatedHigh confidenceSeptember 1996

Source: USGS — National Water Information System, 13244500. Licence: Open.

Method: Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.

Reservoir storage is managed as well as observed: a drawdown may reflect an operating rule, flood-control rule curve or scheduled release rather than a shortage. Compare a month against the same month in other years, and do not read a fall as a supply signal without knowing the operating regime.

Retrieved 25 August 2026.

Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.