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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-02-17
Issued:
2026-02-17
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
57165
62755
102
70587
61483
APR-JUL
46767
53026
100
58910
52774
APR-AUG
53174
59298
102
66256
58186
JAN-SEP
67120
73319
104
81450
70457
JAN-JUL
57318
63575
103
69223
61749
OCT-SEP
77678
83877
106
92008
78842
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-02-17
Issued:
2026-02-17
Hide Forecast
APR-SEP
54701
62103
101
69612
61483
APR-JUL
45284
51805
98
58011
52774
APR-AUG
50823
58611
101
65289
58186
JAN-SEP
65595
72881
103
80389
70457
JAN-JUL
56119
62263
101
68244
61749
OCT-SEP
76153
83440
106
90947
78842
Reference
ESP with 0 Days QPF
Ensemble:
2026-02-17
Issued:
2026-02-17
Hide Forecast
APR-SEP
53541
61530
100
68503
61483
APR-JUL
44491
51526
98
57203
52774
APR-AUG
49761
58170
100
64449
58186
JAN-SEP
65041
72533
103
79396
70457
JAN-JUL
56141
62686
102
67399
61749
OCT-SEP
75599
83091
105
89954
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, 78, , 82
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, 97, , 101
ESP10, 230, 304, 349, 400, 438, 101, , 105
ESP10, 233, 305, 354, 401, 439, 106, , 110
ESP10, 234, 306, 356, 402, 440, 111, , 115
ESP10, 234, 305, 354, 400, 439, 116, , 120
ESP10, 237, 309, 357, 401, 439, 120, , 124
ESP10, 236, 310, 358, 403, 439, 125, , 129
ESP10, 229, 303, 351, 396, 435, 130, , 134
ESP10, 231, 305, 355, 398, 437, 135, , 139
ESP10, 233, 304, 353, 395, 437, 139, , 143
ESP10, 221, 293, 339, 385, 428, 144, , 148
ESP10, 211, 284, 331, 380, 418, 149, , 153
ESP10, 221, 295, 345, 392, 429, 154, , 158
ESP10, 221, 294, 347, 392, 432, 158, , 162
ESP10, 221, 294, 349, 398, 435, 163, , 167
ESP10, 210, 285, 345, 388, 426, 168, , 172
ESP10, 208, 287, 343, 389, 424, 173, , 177
ESP10, 202, 288, 337, 387, 424, 177, , 181
ESP10, 210, 298, 347, 395, 432, 182, , 186
ESP10, 214, 307, 353, 399, 435, 187, , 191
ESP10, 219, 318, 357, 407, 440, 192, , 196
ESP10, 221, 316, 357, 406, 441, 196, , 200
ESP10, 223, 318, 357, 407, 441, 201, , 205
ESP10, 213, 309, 349, 398, 432, 206, , 210
ESP10, 198, 294, 337, 390, 421, 211, , 215
ESP10, 199, 295, 341, 392, 427, 215, , 219
ESP10, 203, 298, 344, 396, 433, 220, , 224
ESP10, 203, 295, 342, 392, 433, 225, , 229
ESP10, 214, 306, 351, 400, 441, 230, , 234
ESP10, 222, 309, 352, 400, 442, 234, , 238
ESP10, 222, 309, 352, 400, 440, 239, , 243
ESP10, 223, 308, 353, 397, 441, 244, , 248
ESP10, 216, 298, 348, 388, 433, 249, , 253
ESP10, 224, 303, 355, 393, 439, 253, , 257
ESP10, 222, 303, 358, 392, 439, 258, , 262
ESP10, 227, 304, 360, 390, 439, 263, , 267
ESP10, 229, 308, 358, 395, 436, 268, , 272
ESP10, 239, 316, 366, 404, 443, 272, , 276
ESP10, 251, 321, 372, 404, 448, 277, , 281
ESP10, 243, 314, 363, 395, 438, 282, , 286
ESP10, 252, 319, 368, 400, 444, 287, , 291
ESP10, 244, 311, 360, 393, 441, 291, , 295
ESP10, 252, 316, 366, 397, 449, 296, , 300
ESP10, 247, 309, 362, 394, 445, 301, , 305
ESP10, 250, 310, 364, 394, 448, 306, , 310
ESP10, 253, 312, 365, 397, 450, 310, , 314
ESP10, 254, 317, 362, 397, 447, 315, , 319
ESP10, 252, 317, 364, 394, 443, 320, , 324
ESP10, 261, 327, 374, 405, 450, 325, , 329
ESP10, 256, 321, 368, 403, 446, 329, , 333
ESP10, 259, 320, 365, 402, 447, 334, , 338
ESP10, 257, 315, 360, 398, 443, 339, , 343
ESP10, 258, 314, 360, 401, 442, 344, , 348
ESP10, 258, 317, 366, 407, 442, 348, , 352
ESP10, 250, 304, 353, 398, 433, 353, , 357
ESP10, 239, 295, 342, 389, 424, 358, , 362
ESP10, 243, 298, 346, 390, 428, 363, , 367
ESP10, 238, 292, 340, 382, 421, 367, , 371
ESP10, 221, 273, 320, 364, 410, 372, , 376
ESP10, 223, 276, 326, 368, 415, 377, , 381
ESP10, 219, 272, 323, 363, 412, 382, , 386
ESP10, 227, 280, 334, 370, 420, 386, , 390
ESP10, 216, 264, 320, 356, 407, 391, , 395
ESP10, 189, 239, 292, 329, 384, 396, , 400
ESP10, 181, 232, 285, 320, 376, 401, , 405
ESP10, 179, 238, 286, 319, 377, 405, , 409
ESP10, 186, 250, 292, 327, 387, 410, , 414
ESP10, 187, 251, 296, 331, 392, 415, , 419
ESP10, 181, 242, 289, 323, 384, 420, , 424
ESP10, 187, 239, 294, 322, 383, 424, , 428
ESP10, 190, 239, 297, 324, 386, 429, , 433
ESP10, 192, 240, 304, 325, 388, 434, , 438
ESP10, 190, 242, 302, 324, 385, 439, , 443
ESP10, 182, 235, 293, 318, 377, 443, , 447
ESP10, 186, 233, 286, 314, 373, 448, , 452
ESP10, 199, 241, 291, 321, 379, 453, , 457
ESP10, 204, 241, 291, 319, 379, 458, , 462
ESP10, 216, 256, 301, 328, 390, 462, , 466
ESP10, 222, 258, 302, 332, 393, 467, , 471
ESP10, 217, 251, 297, 330, 389, 472, , 476
ESP10, 214, 248, 295, 332, 387, 477, , 481
ESP10, 219, 249, 299, 333, 388, 481, , 485
ESP10, 225, 255, 301, 334, 396, 486, , 490
ESP10, 222, 256, 298, 333, 395, 491, , 495
ESP10, 225, 260, 302, 335, 396, 496, , 500
ESP10, 232, 267, 310, 341, 398, 500, , 504
ESP10, 231, 272, 307, 337, 394, 505, , 509
ESP10, 225, 266, 304, 331, 392, 510, , 514
ESP10, 226, 267, 307, 332, 395, 515, , 519
ESP10, 217, 262, 300, 325, 389, 519, , 523
ESP10, 215, 268, 300, 324, 390, 524, , 528
ESP10, 215, 266, 303, 325, 390, 529, , 533
ESP10, 214, 267, 299, 327, 387, 534, , 538
ESP10, 217, 268, 297, 327, 385, 538, , 542
ESP10, 220, 263, 293, 328, 381, 543, , 547
ESP10, 218, 260, 292, 330, 377, 548, , 552
ESP10, 219, 259, 294, 332, 376, 553, , 557
ESP10, 218, 257, 294, 333, 373, 557, , 561
ESP10, 215, 260, 295, 330, 370, 562, , 566
ESP10, 218, 261, 295, 329, 371, 567, , 571
ESP10, 219, 264, 297, 327, 370, 572, , 576
ESP10, 218, 269, 296, 326, 370, 576, , 580
ESP10, 219, 271, 300, 328, 370, 581, , 585
ESP10, 220, 272, 300, 327, 372, 586, , 590
ESP10, 231, 282, 309, 334, 380, 591, , 595
ESP10, 239, 287, 312, 339, 381, 595, , 599
ESP10, 243, 294, 319, 343, 387, 600, , 604
ESP10, 243, 297, 320, 344, 387, 605, , 609
ESP10, 247, 299, 327, 348, 391, 610, , 614
ESP10, 246, 299, 326, 349, 391, 614, , 618
ESP10, 244, 295, 320, 345, 385, 619, , 623
ESP10, 247, 300, 325, 349, 388, 624, , 628
ESP10, 248, 304, 325, 352, 389, 629, , 633
ESP10, 253, 306, 325, 352, 392, 633, , 637
ESP10, 252, 310, 325, 353, 394, 638, , 642
ESP10, 252, 308, 326, 353, 393, 643, , 647
ESP10, 244, 298, 317, 344, 386, 648, , 652
ESP10, 238, 290, 310, 338, 379, 652, , 656
ESP10, 249, 293, 314, 342, 382, 657, , 661
ESP10, 257, 295, 315, 341, 381, 662, , 666
ESP10, 254, 293, 315, 339, 379, 667, , 671
ESP10, 252, 290, 312, 335, 375, 671, , 675
ESP10, 261, 300, 318, 344, 383, 676, , 680
ESP10, 263, 297, 317, 342, 379, 681, , 685
ESP10, 260, 295, 316, 341, 376, 686, , 690
ESP10, 262, 300, 319, 344, 376, 690, , 694
ESP10, 264, 304, 324, 345, 375, 695, , 699
ESP10, 259, 298, 319, 339, 369, 700, , 704
ESP10, 264, 300, 322, 343, 372, 705, , 709
ESP10, 261, 300, 321, 343, 368, 709, , 713
ESP10, 248, 288, 306, 331, 355, 714, , 718
ESP10, 249, 288, 306, 333, 354, 719, , 723
ESP10, 255, 294, 315, 339, 361, 724, , 728
ESP10, 245, 282, 306, 328, 350, 728, , 732
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/watersupply/GCDW1W_SQIN.ESPF10.csv
GCDW1W_SQIN.ESPF0.csv|2026-02-17
GCDW1W_SQIN.ESPF10.csv|2026-02-17
GCDW1W_SQIN.ESPFM.csv|2026-02-17
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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