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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-01-04
Issued:
2026-01-04
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
52108
63558
103
74188
61483
APR-JUL
43225
53062
101
63522
52774
APR-AUG
48496
59498
102
69714
58186
JAN-SEP
62640
74148
105
86156
70457
JAN-JUL
53276
63958
104
74135
61749
OCT-SEP
73198
84706
107
96715
78842
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-01-04
Issued:
2026-01-04
Hide Forecast
APR-SEP
53571
65515
107
76755
61483
APR-JUL
44096
55339
105
65340
52774
APR-AUG
49771
61659
106
72027
58186
JAN-SEP
65308
77059
109
87583
70457
JAN-JUL
56004
65963
107
77252
61749
OCT-SEP
75866
87618
111
98141
78842
Reference
ESP with 0 Days QPF
Ensemble:
2026-01-04
Issued:
2026-01-04
Hide Forecast
APR-SEP
52939
64640
105
75041
61483
APR-JUL
43382
53997
102
64045
52774
APR-AUG
49187
60928
105
70345
58186
JAN-SEP
63934
75807
108
85912
70457
JAN-JUL
54673
64651
105
76557
61749
OCT-SEP
74492
86365
110
96470
78842
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 231, 299, 355, 408, 434, 75, , 79
ESP10, 226, 294, 350, 403, 429, 82, , 86
ESP10, 229, 303, 354, 405, 434, 89, , 93
ESP10, 227, 306, 352, 403, 432, 96, , 100
ESP10, 226, 306, 349, 400, 429, 103, , 107
ESP10, 224, 303, 348, 399, 431, 109, , 113
ESP10, 230, 304, 349, 400, 438, 116, , 120
ESP10, 233, 305, 354, 401, 439, 123, , 127
ESP10, 234, 306, 356, 402, 440, 130, , 134
ESP10, 234, 305, 354, 400, 439, 137, , 141
ESP10, 237, 309, 357, 401, 439, 144, , 148
ESP10, 236, 310, 358, 403, 439, 151, , 155
ESP10, 229, 303, 351, 396, 435, 158, , 162
ESP10, 231, 305, 355, 398, 437, 165, , 169
ESP10, 233, 304, 353, 395, 437, 172, , 176
ESP10, 221, 293, 339, 385, 428, 179, , 183
ESP10, 211, 284, 331, 380, 418, 185, , 189
ESP10, 221, 295, 345, 392, 429, 192, , 196
ESP10, 221, 294, 347, 392, 432, 199, , 203
ESP10, 221, 294, 349, 398, 435, 206, , 210
ESP10, 210, 285, 345, 388, 426, 213, , 217
ESP10, 208, 287, 343, 389, 424, 220, , 224
ESP10, 202, 288, 337, 387, 424, 227, , 231
ESP10, 210, 298, 347, 395, 432, 234, , 238
ESP10, 214, 307, 353, 399, 435, 241, , 245
ESP10, 219, 318, 357, 407, 440, 248, , 252
ESP10, 221, 316, 357, 406, 441, 254, , 258
ESP10, 223, 318, 357, 407, 441, 261, , 265
ESP10, 213, 309, 349, 398, 432, 268, , 272
ESP10, 198, 294, 337, 390, 421, 275, , 279
ESP10, 199, 295, 341, 392, 427, 282, , 286
ESP10, 203, 298, 344, 396, 433, 289, , 293
ESP10, 203, 295, 342, 392, 433, 296, , 300
ESP10, 214, 306, 351, 400, 441, 303, , 307
ESP10, 222, 309, 352, 400, 442, 310, , 314
ESP10, 222, 309, 352, 400, 440, 317, , 321
ESP10, 223, 308, 353, 397, 441, 324, , 328
ESP10, 216, 298, 348, 388, 433, 330, , 334
ESP10, 224, 303, 355, 393, 439, 337, , 341
ESP10, 222, 303, 358, 392, 439, 344, , 348
ESP10, 227, 304, 360, 390, 439, 351, , 355
ESP10, 229, 308, 358, 395, 436, 358, , 362
ESP10, 239, 316, 366, 404, 443, 365, , 369
ESP10, 251, 321, 372, 404, 448, 372, , 376
ESP10, 243, 314, 363, 395, 438, 379, , 383
ESP10, 252, 319, 368, 400, 444, 386, , 390
ESP10, 244, 311, 360, 393, 441, 393, , 397
ESP10, 252, 316, 366, 397, 449, 400, , 404
ESP10, 247, 309, 362, 394, 445, 406, , 410
ESP10, 250, 310, 364, 394, 448, 413, , 417
ESP10, 253, 312, 365, 397, 450, 420, , 424
ESP10, 254, 317, 362, 397, 447, 427, , 431
ESP10, 252, 317, 364, 394, 443, 434, , 438
ESP10, 261, 327, 374, 405, 450, 441, , 445
ESP10, 256, 321, 368, 403, 446, 448, , 452
ESP10, 259, 320, 365, 402, 447, 455, , 459
ESP10, 257, 315, 360, 398, 443, 462, , 466
ESP10, 258, 314, 360, 401, 442, 469, , 473
ESP10, 258, 317, 366, 407, 442, 476, , 480
ESP10, 250, 304, 353, 398, 433, 482, , 486
ESP10, 239, 295, 342, 389, 424, 489, , 493
ESP10, 243, 298, 346, 390, 428, 496, , 500
ESP10, 238, 292, 340, 382, 421, 503, , 507
ESP10, 221, 273, 320, 364, 410, 510, , 514
ESP10, 223, 276, 326, 368, 415, 517, , 521
ESP10, 219, 272, 323, 363, 412, 524, , 528
ESP10, 227, 280, 334, 370, 420, 531, , 535
ESP10, 216, 264, 320, 356, 407, 538, , 542
ESP10, 189, 239, 292, 329, 384, 545, , 549
ESP10, 181, 232, 285, 320, 376, 552, , 556
ESP10, 179, 238, 286, 319, 377, 558, , 562
ESP10, 186, 250, 292, 327, 387, 565, , 569
ESP10, 187, 251, 296, 331, 392, 572, , 576
ESP10, 181, 242, 289, 323, 384, 579, , 583
ESP10, 187, 239, 294, 322, 383, 586, , 590
ESP10, 190, 239, 297, 324, 386, 593, , 597
ESP10, 192, 240, 304, 325, 388, 600, , 604
ESP10, 190, 242, 302, 324, 385, 607, , 611
ESP10, 182, 235, 293, 318, 377, 614, , 618
ESP10, 186, 233, 286, 314, 373, 621, , 625
ESP10, 199, 241, 291, 321, 379, 627, , 631
ESP10, 204, 241, 291, 319, 379, 634, , 638
ESP10, 216, 256, 301, 328, 390, 641, , 645
ESP10, 222, 258, 302, 332, 393, 648, , 652
ESP10, 217, 251, 297, 330, 389, 655, , 659
ESP10, 214, 248, 295, 332, 387, 662, , 666
ESP10, 219, 249, 299, 333, 388, 669, , 673
ESP10, 225, 255, 301, 334, 396, 676, , 680
ESP10, 222, 256, 298, 333, 395, 683, , 687
ESP10, 225, 260, 302, 335, 396, 690, , 694
ESP10, 232, 267, 310, 341, 398, 697, , 701
ESP10, 231, 272, 307, 337, 394, 703, , 707
ESP10, 225, 266, 304, 331, 392, 710, , 714
ESP10, 226, 267, 307, 332, 395, 717, , 721
ESP10, 217, 262, 300, 325, 389, 724, , 728
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/watersupply/GCDW1W_SQIN.ESPF10.csv
GCDW1W_SQIN.ESPF0.csv|2026-01-04
GCDW1W_SQIN.ESPF10.csv|2026-01-04
GCDW1W_SQIN.ESPFM.csv|2026-01-04
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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