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COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2025
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2025-07-15
Issued:
2025-07-15
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
47485
48094
78
49578
61483
APR-JUL
40832
40939
78
41040
52774
APR-AUG
44921
45223
78
45849
58186
JAN-SEP
55217
55826
79
57309
70457
JAN-JUL
48564
48671
79
48771
61749
OCT-SEP
63515
64124
81
65607
78842
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2025-07-15
Issued:
2025-07-15
Hide Forecast
APR-SEP
47350
47878
78
49173
61483
APR-JUL
40603
40800
77
41193
52774
APR-AUG
44644
45071
77
45768
58186
JAN-SEP
55082
55610
79
56905
70457
JAN-JUL
48335
48531
79
48924
61749
OCT-SEP
63380
63908
81
65203
78842
Reference
ESP with 0 Days QPF
Ensemble:
2025-07-15
Issued:
2025-07-15
Hide Forecast
APR-SEP
47294
47839
78
49164
61483
APR-JUL
40547
40808
77
41149
52774
APR-AUG
44593
45043
77
45746
58186
JAN-SEP
55026
55570
79
56896
70457
JAN-JUL
48278
48539
79
48880
61749
OCT-SEP
63324
63868
81
65194
78842
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 199, 269, 332, 383, 415, 70, , 74
ESP10, 202, 270, 332, 386, 417, 73, , 77
ESP10, 203, 281, 332, 388, 421, 75, , 79
ESP10, 201, 286, 330, 386, 420, 77, , 81
ESP10, 203, 288, 331, 386, 419, 80, , 84
ESP10, 204, 288, 336, 385, 424, 82, , 86
ESP10, 209, 287, 335, 385, 428, 84, , 88
ESP10, 211, 286, 337, 387, 428, 87, , 91
ESP10, 204, 279, 329, 381, 421, 89, , 93
ESP10, 203, 279, 326, 378, 421, 91, , 95
ESP10, 202, 280, 325, 373, 417, 94, , 98
ESP10, 199, 280, 324, 373, 415, 96, , 100
ESP10, 205, 285, 330, 381, 423, 98, , 102
ESP10, 208, 287, 333, 383, 426, 100, , 104
ESP10, 210, 285, 331, 378, 424, 103, , 107
ESP10, 202, 280, 324, 374, 421, 105, , 109
ESP10, 199, 276, 323, 377, 417, 107, , 111
ESP10, 192, 268, 318, 370, 411, 110, , 114
ESP10, 188, 264, 320, 368, 411, 112, , 116
ESP10, 183, 259, 317, 370, 412, 114, , 118
ESP10, 182, 262, 322, 370, 412, 117, , 121
ESP10, 189, 272, 329, 378, 418, 119, , 123
ESP10, 184, 272, 323, 377, 417, 121, , 125
ESP10, 188, 278, 329, 383, 422, 124, , 128
ESP10, 191, 282, 333, 384, 423, 126, , 130
ESP10, 194, 296, 338, 392, 426, 128, , 132
ESP10, 202, 301, 342, 396, 433, 131, , 135
ESP10, 210, 309, 349, 402, 439, 133, , 137
ESP10, 207, 306, 347, 399, 437, 135, , 139
ESP10, 203, 302, 346, 401, 436, 138, , 142
ESP10, 188, 287, 333, 388, 428, 140, , 144
ESP10, 185, 284, 331, 383, 427, 142, , 146
ESP10, 188, 285, 334, 381, 430, 145, , 149
ESP10, 183, 281, 327, 373, 424, 147, , 151
ESP10, 180, 272, 316, 363, 414, 149, , 153
ESP10, 179, 270, 316, 360, 411, 151, , 155
ESP10, 186, 273, 322, 363, 417, 154, , 158
ESP10, 177, 260, 315, 355, 407, 156, , 160
ESP10, 175, 256, 314, 352, 406, 158, , 162
ESP10, 185, 270, 327, 364, 416, 161, , 165
ESP10, 204, 286, 343, 376, 430, 163, , 167
ESP10, 209, 294, 343, 387, 431, 165, , 169
ESP10, 200, 283, 333, 376, 419, 168, , 172
ESP10, 211, 287, 338, 376, 424, 170, , 174
ESP10, 175, 254, 302, 339, 388, 172, , 176
ESP10, 169, 243, 294, 331, 383, 175, , 179
ESP10, 174, 249, 299, 337, 391, 177, , 181
ESP10, 190, 262, 315, 348, 406, 179, , 183
ESP10, 195, 266, 320, 354, 410, 182, , 186
ESP10, 204, 272, 326, 360, 419, 184, , 188
ESP10, 202, 269, 318, 360, 415, 186, , 190
ESP10, 211, 283, 322, 368, 421, 189, , 193
ESP10, 219, 295, 341, 376, 426, 191, , 195
ESP10, 216, 293, 339, 377, 423, 193, , 197
ESP10, 209, 286, 332, 374, 417, 196, , 200
ESP10, 218, 287, 332, 376, 421, 198, , 202
ESP10, 213, 280, 324, 367, 414, 200, , 204
ESP10, 216, 280, 324, 373, 415, 202, , 206
ESP10, 219, 285, 329, 383, 418, 205, , 209
ESP10, 231, 292, 339, 388, 423, 207, , 211
ESP10, 231, 291, 339, 391, 425, 209, , 213
ESP10, 229, 290, 337, 386, 425, 212, , 216
ESP10, 232, 290, 338, 384, 425, 214, , 218
ESP10, 228, 278, 330, 376, 423, 216, , 220
ESP10, 232, 281, 340, 382, 430, 219, , 223
ESP10, 236, 285, 346, 384, 433, 221, , 225
ESP10, 228, 277, 342, 377, 428, 223, , 227
ESP10, 238, 288, 351, 385, 436, 226, , 230
ESP10, 235, 284, 347, 381, 435, 228, , 232
ESP10, 236, 288, 341, 375, 431, 230, , 234
ESP10, 250, 311, 357, 389, 445, 233, , 237
ESP10, 250, 318, 358, 391, 448, 235, , 239
ESP10, 245, 312, 353, 388, 446, 237, , 241
ESP10, 238, 302, 346, 380, 439, 240, , 244
ESP10, 229, 285, 340, 366, 425, 242, , 246
ESP10, 224, 276, 333, 360, 419, 244, , 248
ESP10, 227, 277, 340, 362, 422, 247, , 251
ESP10, 232, 285, 344, 368, 425, 249, , 253
ESP10, 233, 287, 345, 372, 426, 251, , 255
ESP10, 234, 280, 333, 363, 417, 253, , 257
ESP10, 230, 272, 322, 353, 408, 256, , 260
ESP10, 243, 280, 328, 359, 414, 258, , 262
ESP10, 239, 279, 322, 353, 411, 260, , 264
ESP10, 252, 289, 333, 364, 421, 263, , 267
ESP10, 246, 280, 328, 361, 415, 265, , 269
ESP10, 256, 290, 337, 374, 424, 267, , 271
ESP10, 252, 284, 331, 366, 418, 270, , 274
ESP10, 256, 288, 333, 366, 428, 272, , 276
ESP10, 256, 292, 334, 369, 429, 274, , 278
ESP10, 264, 298, 341, 373, 433, 277, , 281
ESP10, 267, 303, 345, 376, 432, 279, , 283
ESP10, 258, 300, 336, 367, 422, 281, , 285
ESP10, 262, 303, 344, 370, 427, 284, , 288
ESP10, 267, 308, 350, 375, 436, 286, , 290
ESP10, 265, 320, 355, 380, 438, 291, , 295
ESP10, 266, 319, 357, 380, 440, 293, , 297
ESP10, 270, 321, 357, 385, 442, 295, , 299
ESP10, 276, 325, 358, 387, 443, 298, , 302
ESP10, 285, 327, 361, 392, 444, 300, , 304
ESP10, 287, 328, 362, 397, 445, 302, , 306
ESP10, 289, 329, 364, 401, 446, 304, , 308
ESP10, 291, 329, 365, 402, 445, 307, , 311
ESP10, 289, 334, 368, 404, 443, 309, , 313
ESP10, 293, 337, 372, 404, 445, 311, , 315
ESP10, 296, 343, 374, 404, 446, 314, , 318
ESP10, 303, 353, 379, 409, 449, 316, , 320
ESP10, 302, 353, 381, 409, 449, 318, , 322
ESP10, 305, 358, 383, 410, 451, 321, , 325
ESP10, 313, 363, 390, 415, 455, 323, , 327
ESP10, 318, 365, 390, 416, 454, 325, , 329
ESP10, 320, 370, 392, 419, 457, 328, , 332
ESP10, 317, 369, 391, 417, 455, 330, , 334
ESP10, 314, 366, 393, 415, 453, 332, , 336
ESP10, 315, 366, 394, 417, 454, 335, , 339
ESP10, 319, 368, 396, 420, 454, 337, , 341
ESP10, 313, 366, 392, 415, 450, 339, , 343
ESP10, 308, 367, 387, 411, 446, 342, , 346
ESP10, 315, 371, 388, 414, 449, 344, , 348
ESP10, 313, 373, 387, 415, 451, 346, , 350
ESP10, 314, 374, 390, 417, 453, 349, , 353
ESP10, 321, 378, 395, 422, 459, 351, , 355
ESP10, 321, 376, 394, 421, 459, 353, , 357
ESP10, 323, 373, 392, 419, 458, 355, , 359
ESP10, 331, 374, 393, 418, 459, 358, , 362
ESP10, 328, 373, 392, 416, 457, 360, , 364
ESP10, 331, 373, 393, 416, 458, 362, , 366
ESP10, 334, 377, 392, 416, 457, 365, , 369
ESP10, 328, 365, 382, 408, 447, 367, , 371
ESP10, 336, 374, 394, 417, 453, 369, , 373
ESP10, 334, 377, 395, 416, 450, 372, , 376
ESP10, 340, 382, 401, 422, 453, 374, , 378
ESP10, 347, 387, 407, 426, 456, 376, , 380
ESP10, 347, 386, 406, 426, 455, 379, , 383
ESP10, 347, 389, 407, 430, 455, 381, , 385
ESP10, 336, 377, 395, 419, 442, 383, , 387
ESP10, 330, 372, 388, 414, 437, 386, , 390
ESP10, 326, 367, 387, 410, 434, 388, , 392
ESP10, 330, 369, 392, 413, 436, 390, , 394
ESP10, 333, 369, 393, 412, 438, 393, , 397
ESP10, 337, 370, 395, 412, 440, 395, , 399
ESP10, 336, 373, 394, 411, 439, 397, , 401
ESP10, 331, 364, 387, 405, 435, 400, , 404
ESP10, 326, 355, 380, 402, 428, 402, , 406
ESP10, 336, 360, 387, 410, 436, 404, , 408
ESP10, 344, 373, 395, 420, 444, 406, , 410
ESP10, 346, 379, 398, 422, 446, 409, , 413
ESP10, 348, 380, 398, 421, 446, 411, , 415
ESP10, 348, 379, 397, 417, 443, 413, , 417
ESP10, 349, 375, 394, 412, 437, 416, , 420
ESP10, 347, 372, 392, 409, 433, 418, , 422
ESP10, 350, 375, 394, 411, 434, 420, , 424
ESP10, 350, 374, 395, 409, 433, 423, , 427
ESP10, 353, 377, 404, 413, 438, 425, , 429
ESP10, 346, 374, 396, 408, 430, 427, , 431
ESP10, 343, 369, 388, 405, 423, 430, , 434
ESP10, 333, 360, 378, 394, 414, 432, , 436
ESP10, 339, 365, 381, 396, 418, 434, , 438
ESP10, 342, 368, 383, 401, 421, 437, , 441
ESP10, 340, 367, 379, 398, 418, 439, , 443
ESP10, 335, 364, 376, 396, 413, 441, , 445
ESP10, 327, 357, 369, 389, 406, 444, , 448
ESP10, 326, 353, 364, 385, 401, 446, , 450
ESP10, 320, 347, 357, 381, 396, 448, , 452
ESP10, 316, 344, 353, 377, 395, 451, , 455
ESP10, 315, 342, 351, 374, 394, 453, , 457
ESP10, 316, 340, 350, 370, 393, 455, , 459
ESP10, 310, 333, 345, 364, 387, 457, , 461
ESP10, 314, 335, 351, 368, 391, 460, , 464
ESP10, 316, 337, 353, 369, 395, 462, , 466
ESP10, 309, 326, 344, 358, 386, 464, , 468
ESP10, 311, 325, 341, 353, 383, 467, , 471
ESP10, 308, 321, 338, 348, 377, 469, , 473
ESP10, 292, 307, 325, 335, 362, 471, , 475
ESP10, 290, 306, 324, 334, 361, 474, , 478
ESP10, 289, 307, 325, 338, 361, 476, , 480
ESP10, 297, 316, 334, 350, 371, 478, , 482
ESP10, 296, 317, 336, 355, 373, 481, , 485
ESP10, 301, 325, 343, 360, 377, 483, , 487
ESP10, 308, 330, 348, 366, 382, 485, , 489
ESP10, 310, 330, 348, 368, 383, 488, , 492
ESP10, 305, 328, 343, 361, 378, 490, , 494
ESP10, 310, 335, 349, 366, 384, 492, , 496
ESP10, 301, 327, 344, 359, 378, 495, , 499
ESP10, 295, 322, 342, 357, 374, 497, , 501
ESP10, 295, 321, 341, 358, 376, 499, , 503
ESP10, 299, 329, 346, 364, 380, 502, , 506
ESP10, 300, 331, 349, 366, 382, 504, , 508
ESP10, 298, 327, 347, 363, 380, 506, , 510
ESP10, 300, 329, 347, 365, 380, 508, , 512
ESP10, 300, 331, 348, 365, 379, 511, , 515
ESP10, 303, 334, 351, 368, 381, 513, , 517
ESP10, 301, 331, 348, 366, 379, 515, , 519
ESP10, 300, 327, 345, 362, 375, 518, , 522
ESP10, 302, 333, 344, 363, 374, 520, , 524
ESP10, 310, 341, 350, 370, 383, 522, , 526
ESP10, 314, 342, 351, 371, 384, 525, , 529
ESP10, 316, 345, 352, 374, 385, 527, , 531
ESP10, 313, 339, 351, 369, 382, 529, , 533
ESP10, 314, 339, 354, 370, 382, 532, , 536
ESP10, 315, 339, 355, 372, 383, 534, , 538
ESP10, 315, 340, 356, 374, 384, 536, , 540
ESP10, 320, 345, 363, 380, 390, 539, , 543
ESP10, 325, 350, 369, 385, 396, 541, , 545
ESP10, 326, 351, 371, 386, 400, 543, , 547
ESP10, 327, 353, 372, 390, 402, 546, , 550
ESP10, 324, 356, 368, 385, 400, 548, , 552
ESP10, 321, 355, 368, 383, 399, 550, , 554
ESP10, 320, 354, 369, 382, 398, 553, , 557
ESP10, 326, 363, 376, 388, 404, 555, , 559
ESP10, 324, 360, 374, 387, 401, 557, , 561
ESP10, 335, 369, 384, 399, 409, 559, , 563
ESP10, 322, 356, 370, 385, 395, 562, , 566
ESP10, 324, 357, 372, 388, 395, 564, , 568
ESP10, 323, 353, 370, 384, 391, 566, , 570
ESP10, 324, 349, 367, 382, 388, 569, , 573
ESP10, 318, 341, 359, 376, 380, 571, , 575
ESP10, 320, 342, 363, 377, 383, 573, , 577
ESP10, 330, 350, 370, 386, 397, 576, , 580
ESP10, 325, 346, 363, 380, 391, 578, , 582
ESP10, 334, 356, 373, 388, 398, 580, , 584
ESP10, 336, 355, 372, 388, 395, 583, , 587
ESP10, 338, 358, 372, 388, 396, 585, , 589
ESP10, 343, 366, 381, 392, 402, 587, , 591
ESP10, 341, 361, 380, 391, 399, 590, , 594
ESP10, 350, 365, 384, 395, 406, 592, , 596
ESP10, 351, 362, 383, 393, 404, 594, , 598
ESP10, 348, 361, 381, 391, 400, 597, , 601
ESP10, 347, 361, 382, 391, 399, 599, , 603
ESP10, 349, 365, 383, 392, 401, 601, , 605
ESP10, 354, 369, 387, 395, 407, 604, , 608
ESP10, 358, 374, 391, 399, 409, 606, , 610
ESP10, 360, 377, 388, 396, 407, 608, , 612
ESP10, 364, 383, 394, 401, 412, 610, , 614
ESP10, 361, 379, 391, 400, 408, 613, , 617
ESP10, 360, 376, 390, 397, 408, 615, , 619
ESP10, 357, 370, 383, 393, 401, 617, , 621
ESP10, 359, 371, 383, 392, 400, 620, , 624
ESP10, 360, 373, 384, 393, 400, 622, , 626
ESP10, 365, 378, 388, 398, 403, 624, , 628
ESP10, 373, 385, 395, 405, 410, 627, , 631
ESP10, 376, 386, 397, 406, 413, 629, , 633
ESP10, 377, 386, 398, 406, 414, 631, , 635
ESP10, 377, 387, 397, 408, 413, 634, , 638
ESP10, 378, 386, 394, 406, 411, 636, , 640
ESP10, 385, 393, 402, 411, 418, 638, , 642
ESP10, 382, 391, 398, 409, 415, 641, , 645
ESP10, 380, 389, 396, 407, 412, 643, , 647
ESP10, 382, 387, 394, 407, 411, 645, , 649
ESP10, 387, 395, 402, 412, 415, 648, , 652
ESP10, 383, 392, 402, 405, 408, 671, , 675
ESP10, 385, 395, 403, 407, 410, 673, , 677
ESP10, 384, 396, 403, 407, 410, 675, , 679
ESP10, 388, 401, 408, 411, 413, 678, , 682
ESP10, 391, 404, 410, 415, 418, 680, , 684
ESP10, 395, 405, 411, 415, 419, 682, , 686
ESP10, 398, 408, 413, 418, 421, 685, , 689
ESP10, 400, 408, 414, 419, 421, 687, , 691
ESP10, 399, 408, 414, 417, 420, 689, , 693
ESP10, 402, 412, 417, 420, 423, 692, , 696
ESP10, 401, 413, 417, 419, 422, 694, , 698
ESP10, 402, 412, 416, 419, 422, 696, , 700
ESP10, 407, 414, 419, 422, 424, 699, , 703
ESP10, 407, 413, 419, 421, 423, 701, , 705
ESP10, 409, 413, 420, 422, 423, 703, , 707
ESP10, 407, 412, 418, 421, 422, 706, , 710
ESP10, 409, 413, 420, 422, 424, 708, , 712
ESP10, 410, 414, 420, 422, 424, 710, , 714
ESP10, 410, 413, 419, 421, 423, 712, , 716
ESP10, 410, 414, 418, 421, 422, 715, , 719
ESP10, 409, 414, 418, 420, 422, 717, , 721
ESP10, 411, 415, 419, 422, 423, 719, , 723
ESP10, 410, 415, 418, 421, 422, 722, , 726
ESP10, 406, 411, 415, 418, 420, 724, , 728
ESP10, 408, 413, 417, 419, 422, 726, , 730
ESP10, 406, 411, 415, 418, 420, 729, , 733
ESP10, 400, 407, 411, 414, 416, 731, , 735
ESP10, 398, 406, 410, 412, 415, 733, , 737
Max Scale
Scale To Data
Scale To Last 45 Days
Show Min/Max Ensemble Volume
Show Tooltips Help
Overlay
ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/watersupply/GCDW1W_SQIN.ESPF10.csv
GCDW1W_SQIN.ESPF0.csv|2025-07-15
GCDW1W_SQIN.ESPF10.csv|2025-07-15
GCDW1W_SQIN.ESPFM.csv|2025-07-15
APR-SEP
COLUMBIA - GRAND COULEE DAM
(
GCDW1
)
Forecasts for Water Year
2026
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2025-07-15
Issued:
2025-07-15
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
47220
58798
96
76124
61483
APR-JUL
39502
48719
92
63583
52774
APR-AUG
43990
55075
95
71790
58186
JAN-SEP
52593
65935
94
83867
70457
JAN-JUL
45189
56611
92
71690
61749
OCT-SEP
59247
73949
94
92574
78842
Move the mouse over the desired "Forecast Period" to display a graph.
Max Scale
Scale To Data
Scale To Last 45 Days
Show Min/Max Ensemble Volume
Show Tooltips Help
Overlay
ESP10
Data Files
/chpsesp/ensemble/watersupply/GCDW1W_SQIN.ESPF10.csv
GCDW1W_SQIN.ESPF0.csv|2025-07-15
GCDW1W_SQIN.ESPF10.csv|2025-07-15
GCDW1W_SQIN.ESPFM.csv|2025-07-15
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
