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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-05-08
Issued:
2026-05-08
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
58393
60909
99
65744
61483
APR-JUL
48826
51302
97
55795
52774
APR-AUG
54581
57059
98
62222
58186
JAN-SEP
71272
73788
105
78622
70457
JAN-JUL
61705
64180
104
68674
61749
OCT-SEP
81830
84346
107
89181
78842
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-05-08
Issued:
2026-05-08
Hide Forecast
APR-SEP
59320
61466
100
66516
61483
APR-JUL
49858
52162
99
56811
52774
APR-AUG
55434
57891
99
62889
58186
JAN-SEP
72199
74345
106
79394
70457
JAN-JUL
62737
65041
105
69690
61749
OCT-SEP
82757
84903
108
89953
78842
Reference
ESP with 0 Days QPF
Ensemble:
2026-05-08
Issued:
2026-05-08
Hide Forecast
APR-SEP
59319
62517
102
68037
61483
APR-JUL
49801
52491
99
57533
52774
APR-AUG
55802
58689
101
64399
58186
JAN-SEP
72198
75396
107
80915
70457
JAN-JUL
62680
65369
106
70412
61749
OCT-SEP
82756
85954
109
91474
78842
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 231, 299, 355, 408, 434, 71, , 75
ESP10, 226, 294, 350, 403, 429, 74, , 78
ESP10, 229, 303, 354, 405, 434, 77, , 81
ESP10, 227, 306, 352, 403, 432, 80, , 84
ESP10, 226, 306, 349, 400, 429, 83, , 87
ESP10, 224, 303, 348, 399, 431, 86, , 90
ESP10, 230, 304, 349, 400, 438, 89, , 93
ESP10, 233, 305, 354, 401, 439, 92, , 96
ESP10, 234, 306, 356, 402, 440, 95, , 99
ESP10, 234, 305, 354, 400, 439, 98, , 102
ESP10, 237, 309, 357, 401, 439, 101, , 105
ESP10, 236, 310, 358, 403, 439, 104, , 108
ESP10, 229, 303, 351, 396, 435, 107, , 111
ESP10, 231, 305, 355, 398, 437, 110, , 114
ESP10, 233, 304, 353, 395, 437, 113, , 117
ESP10, 221, 293, 339, 385, 428, 117, , 121
ESP10, 211, 284, 331, 380, 418, 120, , 124
ESP10, 221, 295, 345, 392, 429, 123, , 127
ESP10, 221, 294, 347, 392, 432, 126, , 130
ESP10, 221, 294, 349, 398, 435, 129, , 133
ESP10, 210, 285, 345, 388, 426, 132, , 136
ESP10, 208, 287, 343, 389, 424, 135, , 139
ESP10, 202, 288, 337, 387, 424, 138, , 142
ESP10, 210, 298, 347, 395, 432, 141, , 145
ESP10, 214, 307, 353, 399, 435, 144, , 148
ESP10, 219, 318, 357, 407, 440, 147, , 151
ESP10, 221, 316, 357, 406, 441, 150, , 154
ESP10, 223, 318, 357, 407, 441, 153, , 157
ESP10, 213, 309, 349, 398, 432, 156, , 160
ESP10, 198, 294, 337, 390, 421, 159, , 163
ESP10, 199, 295, 341, 392, 427, 162, , 166
ESP10, 203, 298, 344, 396, 433, 165, , 169
ESP10, 203, 295, 342, 392, 433, 168, , 172
ESP10, 214, 306, 351, 400, 441, 171, , 175
ESP10, 222, 309, 352, 400, 442, 174, , 178
ESP10, 222, 309, 352, 400, 440, 177, , 181
ESP10, 223, 308, 353, 397, 441, 180, , 184
ESP10, 216, 298, 348, 388, 433, 183, , 187
ESP10, 224, 303, 355, 393, 439, 186, , 190
ESP10, 222, 303, 358, 392, 439, 189, , 193
ESP10, 227, 304, 360, 390, 439, 192, , 196
ESP10, 229, 308, 358, 395, 436, 195, , 199
ESP10, 239, 316, 366, 404, 443, 198, , 202
ESP10, 251, 321, 372, 404, 448, 201, , 205
ESP10, 243, 314, 363, 395, 438, 204, , 208
ESP10, 252, 319, 368, 400, 444, 207, , 211
ESP10, 244, 311, 360, 393, 441, 210, , 214
ESP10, 252, 316, 366, 397, 449, 214, , 218
ESP10, 247, 309, 362, 394, 445, 217, , 221
ESP10, 250, 310, 364, 394, 448, 220, , 224
ESP10, 253, 312, 365, 397, 450, 223, , 227
ESP10, 254, 317, 362, 397, 447, 226, , 230
ESP10, 252, 317, 364, 394, 443, 229, , 233
ESP10, 261, 327, 374, 405, 450, 232, , 236
ESP10, 256, 321, 368, 403, 446, 235, , 239
ESP10, 259, 320, 365, 402, 447, 238, , 242
ESP10, 257, 315, 360, 398, 443, 241, , 245
ESP10, 258, 314, 360, 401, 442, 244, , 248
ESP10, 258, 317, 366, 407, 442, 247, , 251
ESP10, 250, 304, 353, 398, 433, 250, , 254
ESP10, 239, 295, 342, 389, 424, 253, , 257
ESP10, 243, 298, 346, 390, 428, 256, , 260
ESP10, 238, 292, 340, 382, 421, 259, , 263
ESP10, 221, 273, 320, 364, 410, 262, , 266
ESP10, 223, 276, 326, 368, 415, 265, , 269
ESP10, 219, 272, 323, 363, 412, 268, , 272
ESP10, 227, 280, 334, 370, 420, 271, , 275
ESP10, 216, 264, 320, 356, 407, 274, , 278
ESP10, 189, 239, 292, 329, 384, 277, , 281
ESP10, 181, 232, 285, 320, 376, 280, , 284
ESP10, 179, 238, 286, 319, 377, 283, , 287
ESP10, 186, 250, 292, 327, 387, 286, , 290
ESP10, 187, 251, 296, 331, 392, 289, , 293
ESP10, 181, 242, 289, 323, 384, 292, , 296
ESP10, 187, 239, 294, 322, 383, 295, , 299
ESP10, 190, 239, 297, 324, 386, 298, , 302
ESP10, 192, 240, 304, 325, 388, 301, , 305
ESP10, 190, 242, 302, 324, 385, 304, , 308
ESP10, 182, 235, 293, 318, 377, 308, , 312
ESP10, 186, 233, 286, 314, 373, 311, , 315
ESP10, 199, 241, 291, 321, 379, 314, , 318
ESP10, 204, 241, 291, 319, 379, 317, , 321
ESP10, 216, 256, 301, 328, 390, 320, , 324
ESP10, 222, 258, 302, 332, 393, 323, , 327
ESP10, 217, 251, 297, 330, 389, 326, , 330
ESP10, 214, 248, 295, 332, 387, 329, , 333
ESP10, 219, 249, 299, 333, 388, 332, , 336
ESP10, 225, 255, 301, 334, 396, 335, , 339
ESP10, 222, 256, 298, 333, 395, 338, , 342
ESP10, 225, 260, 302, 335, 396, 341, , 345
ESP10, 232, 267, 310, 341, 398, 344, , 348
ESP10, 231, 272, 307, 337, 394, 347, , 351
ESP10, 225, 266, 304, 331, 392, 350, , 354
ESP10, 226, 267, 307, 332, 395, 353, , 357
ESP10, 217, 262, 300, 325, 389, 356, , 360
ESP10, 215, 268, 300, 324, 390, 359, , 363
ESP10, 215, 266, 303, 325, 390, 362, , 366
ESP10, 214, 267, 299, 327, 387, 365, , 369
ESP10, 217, 268, 297, 327, 385, 368, , 372
ESP10, 220, 263, 293, 328, 381, 371, , 375
ESP10, 218, 260, 292, 330, 377, 374, , 378
ESP10, 219, 259, 294, 332, 376, 377, , 381
ESP10, 218, 257, 294, 333, 373, 380, , 384
ESP10, 215, 260, 295, 330, 370, 383, , 387
ESP10, 218, 261, 295, 329, 371, 386, , 390
ESP10, 219, 264, 297, 327, 370, 389, , 393
ESP10, 218, 269, 296, 326, 370, 392, , 396
ESP10, 219, 271, 300, 328, 370, 395, , 399
ESP10, 220, 272, 300, 327, 372, 398, , 402
ESP10, 231, 282, 309, 334, 380, 401, , 405
ESP10, 239, 287, 312, 339, 381, 405, , 409
ESP10, 243, 294, 319, 343, 387, 408, , 412
ESP10, 243, 297, 320, 344, 387, 411, , 415
ESP10, 247, 299, 327, 348, 391, 414, , 418
ESP10, 246, 299, 326, 349, 391, 417, , 421
ESP10, 244, 295, 320, 345, 385, 420, , 424
ESP10, 247, 300, 325, 349, 388, 423, , 427
ESP10, 248, 304, 325, 352, 389, 426, , 430
ESP10, 253, 306, 325, 352, 392, 429, , 433
ESP10, 252, 310, 325, 353, 394, 432, , 436
ESP10, 252, 308, 326, 353, 393, 435, , 439
ESP10, 244, 298, 317, 344, 386, 438, , 442
ESP10, 238, 290, 310, 338, 379, 441, , 445
ESP10, 249, 293, 314, 342, 382, 444, , 448
ESP10, 257, 295, 315, 341, 381, 447, , 451
ESP10, 254, 293, 315, 339, 379, 450, , 454
ESP10, 252, 290, 312, 335, 375, 453, , 457
ESP10, 261, 300, 318, 344, 383, 456, , 460
ESP10, 263, 297, 317, 342, 379, 459, , 463
ESP10, 260, 295, 316, 341, 376, 462, , 466
ESP10, 262, 300, 319, 344, 376, 465, , 469
ESP10, 264, 304, 324, 345, 375, 468, , 472
ESP10, 259, 298, 319, 339, 369, 471, , 475
ESP10, 264, 300, 322, 343, 372, 474, , 478
ESP10, 261, 300, 321, 343, 368, 477, , 481
ESP10, 248, 288, 306, 331, 355, 480, , 484
ESP10, 249, 288, 306, 333, 354, 483, , 487
ESP10, 255, 294, 315, 339, 361, 486, , 490
ESP10, 245, 282, 306, 328, 350, 489, , 493
ESP10, 257, 290, 314, 335, 360, 492, , 496
ESP10, 252, 283, 308, 329, 358, 495, , 499
ESP10, 261, 291, 314, 334, 363, 498, , 502
ESP10, 258, 287, 311, 331, 360, 502, , 506
ESP10, 265, 292, 316, 337, 366, 505, , 509
ESP10, 269, 293, 317, 340, 365, 508, , 512
ESP10, 271, 295, 319, 342, 368, 511, , 515
ESP10, 271, 297, 322, 342, 368, 514, , 518
ESP10, 266, 294, 315, 336, 362, 517, , 521
ESP10, 264, 291, 310, 330, 356, 520, , 524
ESP10, 260, 283, 303, 322, 347, 523, , 527
ESP10, 263, 285, 306, 322, 346, 526, , 530
ESP10, 260, 281, 304, 320, 342, 529, , 533
ESP10, 253, 275, 298, 311, 334, 532, , 536
ESP10, 247, 269, 295, 306, 329, 535, , 539
ESP10, 242, 266, 289, 303, 324, 538, , 542
ESP10, 244, 269, 287, 304, 323, 541, , 545
ESP10, 233, 261, 277, 292, 312, 544, , 548
ESP10, 237, 264, 278, 293, 315, 547, , 551
ESP10, 221, 247, 261, 279, 302, 550, , 554
ESP10, 236, 261, 273, 292, 313, 553, , 557
ESP10, 235, 262, 273, 294, 313, 556, , 560
ESP10, 229, 257, 269, 289, 308, 559, , 563
ESP10, 226, 253, 264, 287, 302, 562, , 566
ESP10, 235, 260, 270, 293, 310, 565, , 569
ESP10, 230, 257, 266, 288, 307, 568, , 572
ESP10, 226, 252, 261, 282, 303, 571, , 575
ESP10, 224, 247, 258, 276, 300, 574, , 578
ESP10, 227, 249, 260, 278, 302, 577, , 581
ESP10, 223, 245, 260, 278, 299, 580, , 584
ESP10, 225, 245, 260, 279, 301, 583, , 587
ESP10, 227, 243, 260, 276, 298, 586, , 590
ESP10, 237, 249, 265, 278, 303, 589, , 593
ESP10, 238, 250, 266, 277, 302, 592, , 596
ESP10, 228, 241, 258, 271, 294, 596, , 600
ESP10, 225, 238, 256, 268, 291, 599, , 603
ESP10, 227, 243, 262, 276, 296, 602, , 606
ESP10, 227, 244, 262, 278, 296, 605, , 609
ESP10, 229, 247, 266, 284, 300, 608, , 612
ESP10, 232, 255, 270, 290, 303, 611, , 615
ESP10, 237, 258, 274, 293, 307, 614, , 618
ESP10, 244, 264, 281, 300, 314, 617, , 621
ESP10, 246, 270, 281, 301, 315, 620, , 624
ESP10, 245, 269, 279, 298, 313, 623, , 627
ESP10, 248, 274, 290, 303, 319, 626, , 630
ESP10, 248, 273, 292, 307, 319, 629, , 633
ESP10, 244, 269, 289, 304, 318, 632, , 636
ESP10, 243, 269, 288, 304, 317, 635, , 639
ESP10, 245, 275, 292, 307, 320, 638, , 642
ESP10, 244, 273, 290, 307, 319, 641, , 645
ESP10, 240, 267, 283, 299, 311, 644, , 648
ESP10, 235, 263, 280, 296, 307, 647, , 651
ESP10, 234, 262, 279, 296, 306, 650, , 654
ESP10, 239, 266, 286, 302, 313, 653, , 657
ESP10, 243, 269, 288, 303, 315, 656, , 660
ESP10, 243, 272, 283, 300, 310, 659, , 663
ESP10, 251, 283, 290, 307, 318, 662, , 666
ESP10, 251, 279, 287, 304, 315, 665, , 669
ESP10, 255, 282, 289, 308, 320, 668, , 672
ESP10, 251, 276, 289, 303, 316, 671, , 675
ESP10, 253, 278, 290, 306, 317, 674, , 678
ESP10, 255, 280, 293, 309, 320, 677, , 681
ESP10, 256, 282, 296, 311, 322, 680, , 684
ESP10, 257, 282, 298, 314, 323, 683, , 687
ESP10, 265, 291, 308, 322, 334, 686, , 690
ESP10, 263, 289, 306, 320, 333, 689, , 693
ESP10, 265, 290, 306, 322, 334, 693, , 697
ESP10, 264, 295, 306, 320, 335, 696, , 700
ESP10, 263, 294, 304, 317, 332, 699, , 703
ESP10, 265, 297, 308, 320, 333, 702, , 706
ESP10, 263, 298, 308, 319, 332, 705, , 709
ESP10, 264, 299, 309, 319, 332, 708, , 712
ESP10, 271, 303, 314, 327, 337, 711, , 715
ESP10, 274, 308, 319, 330, 341, 714, , 718
ESP10, 277, 309, 321, 334, 342, 717, , 721
ESP10, 278, 307, 320, 333, 341, 720, , 724
ESP10, 279, 305, 320, 332, 338, 723, , 727
ESP10, 283, 306, 320, 334, 338, 726, , 730
ESP10, 282, 305, 320, 333, 338, 729, , 733
ESP10, 283, 303, 320, 333, 340, 732, , 736
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/watersupply/GCDW1W_SQIN.ESPF10.csv
GCDW1W_SQIN.ESPF0.csv|2026-05-08
GCDW1W_SQIN.ESPF10.csv|2026-05-08
GCDW1W_SQIN.ESPFM.csv|2026-05-08
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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