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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-02-18
Issued:
2026-02-18
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
55834
61710
100
69095
61483
APR-JUL
45466
51895
98
57525
52774
APR-AUG
51741
57847
99
64844
58186
JAN-SEP
66129
72075
102
79908
70457
JAN-JUL
56371
62673
101
68043
61749
OCT-SEP
76687
82633
105
90467
78842
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-02-18
Issued:
2026-02-18
Hide Forecast
APR-SEP
55007
62236
101
70222
61483
APR-JUL
45480
52250
99
58489
52774
APR-AUG
51237
58228
100
65812
58186
JAN-SEP
65993
72656
103
81081
70457
JAN-JUL
56338
62986
102
68827
61749
OCT-SEP
76552
83214
106
91639
78842
Reference
ESP with 0 Days QPF
Ensemble:
2026-02-18
Issued:
2026-02-18
Hide Forecast
APR-SEP
54038
61676
100
68962
61483
APR-JUL
44710
51924
98
57610
52774
APR-AUG
50181
57978
100
64876
58186
JAN-SEP
65352
72758
103
79851
70457
JAN-JUL
56592
62196
101
67807
61749
OCT-SEP
75910
83316
106
90409
78842
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 231, 299, 355, 408, 434, 73, , 77
ESP10, 226, 294, 350, 403, 429, 77, , 81
ESP10, 229, 303, 354, 405, 434, 82, , 86
ESP10, 227, 306, 352, 403, 432, 87, , 91
ESP10, 226, 306, 349, 400, 429, 92, , 96
ESP10, 224, 303, 348, 399, 431, 96, , 100
ESP10, 230, 304, 349, 400, 438, 101, , 105
ESP10, 233, 305, 354, 401, 439, 106, , 110
ESP10, 234, 306, 356, 402, 440, 110, , 114
ESP10, 234, 305, 354, 400, 439, 115, , 119
ESP10, 237, 309, 357, 401, 439, 120, , 124
ESP10, 236, 310, 358, 403, 439, 125, , 129
ESP10, 229, 303, 351, 396, 435, 129, , 133
ESP10, 231, 305, 355, 398, 437, 134, , 138
ESP10, 233, 304, 353, 395, 437, 139, , 143
ESP10, 221, 293, 339, 385, 428, 143, , 147
ESP10, 211, 284, 331, 380, 418, 148, , 152
ESP10, 221, 295, 345, 392, 429, 153, , 157
ESP10, 221, 294, 347, 392, 432, 158, , 162
ESP10, 221, 294, 349, 398, 435, 162, , 166
ESP10, 210, 285, 345, 388, 426, 167, , 171
ESP10, 208, 287, 343, 389, 424, 172, , 176
ESP10, 202, 288, 337, 387, 424, 177, , 181
ESP10, 210, 298, 347, 395, 432, 181, , 185
ESP10, 214, 307, 353, 399, 435, 186, , 190
ESP10, 219, 318, 357, 407, 440, 191, , 195
ESP10, 221, 316, 357, 406, 441, 195, , 199
ESP10, 223, 318, 357, 407, 441, 200, , 204
ESP10, 213, 309, 349, 398, 432, 205, , 209
ESP10, 198, 294, 337, 390, 421, 210, , 214
ESP10, 199, 295, 341, 392, 427, 214, , 218
ESP10, 203, 298, 344, 396, 433, 219, , 223
ESP10, 203, 295, 342, 392, 433, 224, , 228
ESP10, 214, 306, 351, 400, 441, 228, , 232
ESP10, 222, 309, 352, 400, 442, 233, , 237
ESP10, 222, 309, 352, 400, 440, 238, , 242
ESP10, 223, 308, 353, 397, 441, 243, , 247
ESP10, 216, 298, 348, 388, 433, 247, , 251
ESP10, 224, 303, 355, 393, 439, 252, , 256
ESP10, 222, 303, 358, 392, 439, 257, , 261
ESP10, 227, 304, 360, 390, 439, 261, , 265
ESP10, 229, 308, 358, 395, 436, 266, , 270
ESP10, 239, 316, 366, 404, 443, 271, , 275
ESP10, 251, 321, 372, 404, 448, 276, , 280
ESP10, 243, 314, 363, 395, 438, 280, , 284
ESP10, 252, 319, 368, 400, 444, 285, , 289
ESP10, 244, 311, 360, 393, 441, 290, , 294
ESP10, 252, 316, 366, 397, 449, 294, , 298
ESP10, 247, 309, 362, 394, 445, 299, , 303
ESP10, 250, 310, 364, 394, 448, 304, , 308
ESP10, 253, 312, 365, 397, 450, 309, , 313
ESP10, 254, 317, 362, 397, 447, 313, , 317
ESP10, 252, 317, 364, 394, 443, 318, , 322
ESP10, 261, 327, 374, 405, 450, 323, , 327
ESP10, 256, 321, 368, 403, 446, 328, , 332
ESP10, 259, 320, 365, 402, 447, 332, , 336
ESP10, 257, 315, 360, 398, 443, 337, , 341
ESP10, 258, 314, 360, 401, 442, 342, , 346
ESP10, 258, 317, 366, 407, 442, 346, , 350
ESP10, 250, 304, 353, 398, 433, 351, , 355
ESP10, 239, 295, 342, 389, 424, 356, , 360
ESP10, 243, 298, 346, 390, 428, 361, , 365
ESP10, 238, 292, 340, 382, 421, 365, , 369
ESP10, 221, 273, 320, 364, 410, 370, , 374
ESP10, 223, 276, 326, 368, 415, 375, , 379
ESP10, 219, 272, 323, 363, 412, 379, , 383
ESP10, 227, 280, 334, 370, 420, 384, , 388
ESP10, 216, 264, 320, 356, 407, 389, , 393
ESP10, 189, 239, 292, 329, 384, 394, , 398
ESP10, 181, 232, 285, 320, 376, 398, , 402
ESP10, 179, 238, 286, 319, 377, 403, , 407
ESP10, 186, 250, 292, 327, 387, 408, , 412
ESP10, 187, 251, 296, 331, 392, 412, , 416
ESP10, 181, 242, 289, 323, 384, 417, , 421
ESP10, 187, 239, 294, 322, 383, 422, , 426
ESP10, 190, 239, 297, 324, 386, 427, , 431
ESP10, 192, 240, 304, 325, 388, 431, , 435
ESP10, 190, 242, 302, 324, 385, 436, , 440
ESP10, 182, 235, 293, 318, 377, 441, , 445
ESP10, 186, 233, 286, 314, 373, 445, , 449
ESP10, 199, 241, 291, 321, 379, 450, , 454
ESP10, 204, 241, 291, 319, 379, 455, , 459
ESP10, 216, 256, 301, 328, 390, 460, , 464
ESP10, 222, 258, 302, 332, 393, 464, , 468
ESP10, 217, 251, 297, 330, 389, 469, , 473
ESP10, 214, 248, 295, 332, 387, 474, , 478
ESP10, 219, 249, 299, 333, 388, 478, , 482
ESP10, 225, 255, 301, 334, 396, 483, , 487
ESP10, 222, 256, 298, 333, 395, 488, , 492
ESP10, 225, 260, 302, 335, 396, 493, , 497
ESP10, 232, 267, 310, 341, 398, 497, , 501
ESP10, 231, 272, 307, 337, 394, 502, , 506
ESP10, 225, 266, 304, 331, 392, 507, , 511
ESP10, 226, 267, 307, 332, 395, 512, , 516
ESP10, 217, 262, 300, 325, 389, 516, , 520
ESP10, 215, 268, 300, 324, 390, 521, , 525
ESP10, 215, 266, 303, 325, 390, 526, , 530
ESP10, 214, 267, 299, 327, 387, 530, , 534
ESP10, 217, 268, 297, 327, 385, 535, , 539
ESP10, 220, 263, 293, 328, 381, 540, , 544
ESP10, 218, 260, 292, 330, 377, 545, , 549
ESP10, 219, 259, 294, 332, 376, 549, , 553
ESP10, 218, 257, 294, 333, 373, 554, , 558
ESP10, 215, 260, 295, 330, 370, 559, , 563
ESP10, 218, 261, 295, 329, 371, 563, , 567
ESP10, 219, 264, 297, 327, 370, 568, , 572
ESP10, 218, 269, 296, 326, 370, 573, , 577
ESP10, 219, 271, 300, 328, 370, 578, , 582
ESP10, 220, 272, 300, 327, 372, 582, , 586
ESP10, 231, 282, 309, 334, 380, 587, , 591
ESP10, 239, 287, 312, 339, 381, 592, , 596
ESP10, 243, 294, 319, 343, 387, 596, , 600
ESP10, 243, 297, 320, 344, 387, 601, , 605
ESP10, 247, 299, 327, 348, 391, 606, , 610
ESP10, 246, 299, 326, 349, 391, 611, , 615
ESP10, 244, 295, 320, 345, 385, 615, , 619
ESP10, 247, 300, 325, 349, 388, 620, , 624
ESP10, 248, 304, 325, 352, 389, 625, , 629
ESP10, 253, 306, 325, 352, 392, 629, , 633
ESP10, 252, 310, 325, 353, 394, 634, , 638
ESP10, 252, 308, 326, 353, 393, 639, , 643
ESP10, 244, 298, 317, 344, 386, 644, , 648
ESP10, 238, 290, 310, 338, 379, 648, , 652
ESP10, 249, 293, 314, 342, 382, 653, , 657
ESP10, 257, 295, 315, 341, 381, 658, , 662
ESP10, 254, 293, 315, 339, 379, 663, , 667
ESP10, 252, 290, 312, 335, 375, 667, , 671
ESP10, 261, 300, 318, 344, 383, 672, , 676
ESP10, 263, 297, 317, 342, 379, 677, , 681
ESP10, 260, 295, 316, 341, 376, 681, , 685
ESP10, 262, 300, 319, 344, 376, 686, , 690
ESP10, 264, 304, 324, 345, 375, 691, , 695
ESP10, 259, 298, 319, 339, 369, 696, , 700
ESP10, 264, 300, 322, 343, 372, 700, , 704
ESP10, 261, 300, 321, 343, 368, 705, , 709
ESP10, 248, 288, 306, 331, 355, 710, , 714
ESP10, 249, 288, 306, 333, 354, 714, , 718
ESP10, 255, 294, 315, 339, 361, 719, , 723
ESP10, 245, 282, 306, 328, 350, 724, , 728
ESP10, 257, 290, 314, 335, 360, 729, , 733
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/watersupply/GCDW1W_SQIN.ESPF10.csv
GCDW1W_SQIN.ESPF0.csv|2026-02-18
GCDW1W_SQIN.ESPF10.csv|2026-02-18
GCDW1W_SQIN.ESPFM.csv|2026-02-18
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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