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Archive:
Water Year
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COWLITZ - MAYFIELD RESERVOIR
(
MYDW1
)
Forecasts for Water Year
2026
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-08-08
Issued:
2026-08-08
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
1036
1048
55
1071
1913
APR-JUL
901
901
54
901
1682
APR-AUG
976
979
54
985
1808
JAN-SEP
2650
2661
78
2684
3419
JAN-JUL
2514
2514
79
2514
3188
OCT-SEP
4594
4606
100
4629
4585
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-08-08
Issued:
2026-08-08
Hide Forecast
APR-SEP
1035
1048
55
1074
1913
APR-JUL
901
901
54
901
1682
APR-AUG
976
979
54
988
1808
JAN-SEP
2649
2661
78
2688
3419
JAN-JUL
2514
2514
79
2514
3188
OCT-SEP
4593
4606
100
4632
4585
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-08
Issued:
2026-08-08
Hide Forecast
APR-SEP
1034
1050
55
1071
1913
APR-JUL
901
901
54
901
1682
APR-AUG
976
979
54
988
1808
JAN-SEP
2648
2663
78
2685
3419
JAN-JUL
2514
2514
79
2514
3188
OCT-SEP
4593
4608
100
4630
4585
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 244, 293, 340, 400, 432, 70, , 74
ESP10, 244, 293, 340, 399, 432, 72, , 76
ESP10, 244, 293, 340, 399, 432, 74, , 78
ESP10, 244, 293, 340, 399, 432, 77, , 81
ESP10, 244, 293, 340, 400, 432, 79, , 83
ESP10, 244, 293, 340, 400, 432, 81, , 85
ESP10, 244, 292, 340, 400, 431, 83, , 87
ESP10, 244, 293, 340, 400, 432, 85, , 89
ESP10, 244, 293, 340, 400, 431, 87, , 91
ESP10, 244, 293, 340, 400, 431, 89, , 93
ESP10, 244, 293, 340, 400, 431, 92, , 96
ESP10, 244, 293, 340, 400, 432, 94, , 98
ESP10, 244, 292, 340, 400, 432, 96, , 100
ESP10, 244, 292, 340, 400, 433, 98, , 102
ESP10, 244, 292, 340, 400, 433, 100, , 104
ESP10, 243, 292, 340, 399, 432, 102, , 106
ESP10, 241, 291, 338, 396, 430, 104, , 108
ESP10, 240, 291, 338, 395, 430, 107, , 111
ESP10, 240, 291, 338, 396, 431, 109, , 113
ESP10, 241, 291, 342, 398, 432, 111, , 115
ESP10, 238, 290, 337, 394, 429, 113, , 117
ESP10, 242, 292, 347, 399, 433, 115, , 119
ESP10, 241, 291, 347, 398, 432, 117, , 121
ESP10, 242, 293, 349, 399, 433, 119, , 123
ESP10, 243, 293, 349, 400, 433, 122, , 126
ESP10, 243, 293, 349, 399, 433, 124, , 128
ESP10, 243, 294, 349, 399, 433, 126, , 130
ESP10, 243, 296, 351, 399, 433, 128, , 132
ESP10, 244, 296, 351, 399, 433, 130, , 134
ESP10, 242, 294, 351, 398, 432, 132, , 136
ESP10, 239, 291, 348, 396, 430, 134, , 138
ESP10, 242, 294, 350, 398, 432, 136, , 140
ESP10, 243, 293, 350, 397, 431, 139, , 143
ESP10, 246, 296, 351, 399, 432, 141, , 145
ESP10, 246, 295, 351, 399, 431, 143, , 147
ESP10, 247, 297, 352, 399, 433, 145, , 149
ESP10, 247, 299, 352, 399, 434, 147, , 151
ESP10, 245, 295, 349, 397, 429, 149, , 153
ESP10, 243, 295, 347, 397, 429, 151, , 155
ESP10, 245, 294, 346, 396, 430, 154, , 158
ESP10, 249, 298, 349, 398, 433, 156, , 160
ESP10, 253, 299, 350, 398, 433, 158, , 162
ESP10, 251, 296, 347, 396, 430, 160, , 164
ESP10, 259, 304, 353, 404, 437, 162, , 166
ESP10, 261, 303, 354, 404, 436, 164, , 168
ESP10, 262, 303, 353, 402, 435, 166, , 170
ESP10, 264, 304, 353, 404, 436, 169, , 173
ESP10, 266, 306, 355, 406, 437, 171, , 175
ESP10, 265, 308, 354, 405, 435, 173, , 177
ESP10, 267, 309, 355, 405, 435, 175, , 179
ESP10, 269, 311, 355, 405, 435, 177, , 181
ESP10, 271, 315, 356, 408, 435, 179, , 183
ESP10, 270, 317, 358, 407, 433, 181, , 185
ESP10, 274, 321, 361, 411, 436, 184, , 188
ESP10, 273, 320, 361, 409, 434, 186, , 190
ESP10, 276, 324, 364, 410, 437, 188, , 192
ESP10, 276, 323, 364, 410, 436, 190, , 194
ESP10, 278, 323, 363, 410, 434, 192, , 196
ESP10, 279, 324, 364, 411, 433, 194, , 198
ESP10, 273, 320, 360, 405, 426, 196, , 200
ESP10, 282, 327, 365, 410, 434, 199, , 203
ESP10, 286, 332, 368, 414, 439, 201, , 205
ESP10, 285, 330, 368, 412, 440, 203, , 207
ESP10, 277, 325, 366, 405, 434, 205, , 209
ESP10, 285, 335, 372, 412, 442, 207, , 211
ESP10, 282, 333, 370, 410, 440, 209, , 213
ESP10, 289, 337, 373, 416, 446, 211, , 215
ESP10, 293, 338, 375, 417, 452, 214, , 218
ESP10, 294, 338, 377, 417, 454, 216, , 220
ESP10, 291, 333, 371, 412, 448, 218, , 222
ESP10, 279, 322, 360, 399, 436, 220, , 224
ESP10, 276, 320, 358, 396, 436, 222, , 226
ESP10, 274, 319, 357, 395, 437, 224, , 228
ESP10, 280, 324, 361, 400, 444, 226, , 230
ESP10, 280, 324, 361, 401, 445, 229, , 233
ESP10, 281, 325, 361, 402, 445, 231, , 235
ESP10, 276, 319, 355, 398, 441, 233, , 237
ESP10, 275, 321, 355, 398, 441, 235, , 239
ESP10, 274, 321, 355, 398, 441, 237, , 241
ESP10, 272, 321, 355, 396, 440, 239, , 243
ESP10, 281, 332, 364, 406, 449, 241, , 245
ESP10, 280, 332, 364, 404, 447, 244, , 248
ESP10, 287, 339, 373, 412, 453, 246, , 250
ESP10, 287, 338, 375, 412, 454, 248, , 252
ESP10, 285, 334, 376, 409, 451, 250, , 254
ESP10, 279, 328, 373, 406, 448, 252, , 256
ESP10, 281, 330, 378, 408, 451, 254, , 258
ESP10, 284, 333, 382, 410, 453, 256, , 260
ESP10, 286, 333, 383, 413, 453, 259, , 263
ESP10, 290, 336, 385, 414, 453, 261, , 265
ESP10, 294, 338, 389, 418, 455, 263, , 267
ESP10, 290, 335, 384, 414, 451, 265, , 269
ESP10, 287, 331, 381, 410, 448, 267, , 271
ESP10, 286, 328, 378, 408, 445, 269, , 273
ESP10, 285, 331, 376, 409, 444, 271, , 275
ESP10, 282, 329, 373, 407, 444, 273, , 277
ESP10, 281, 328, 371, 407, 445, 276, , 280
ESP10, 282, 328, 372, 410, 447, 278, , 282
ESP10, 283, 331, 374, 413, 449, 280, , 284
ESP10, 284, 331, 377, 416, 450, 282, , 286
ESP10, 285, 332, 378, 417, 452, 284, , 288
ESP10, 284, 331, 377, 416, 452, 286, , 290
ESP10, 284, 334, 380, 417, 453, 288, , 292
ESP10, 283, 335, 385, 415, 456, 291, , 295
ESP10, 286, 342, 387, 417, 460, 293, , 297
ESP10, 284, 340, 387, 416, 459, 295, , 299
ESP10, 281, 337, 384, 414, 456, 297, , 301
ESP10, 285, 340, 387, 420, 459, 299, , 303
ESP10, 287, 341, 388, 421, 462, 301, , 305
ESP10, 298, 348, 392, 428, 466, 303, , 307
ESP10, 299, 347, 391, 424, 463, 306, , 310
ESP10, 303, 349, 395, 425, 465, 308, , 312
ESP10, 304, 351, 399, 431, 465, 310, , 314
ESP10, 305, 353, 403, 435, 467, 312, , 316
ESP10, 304, 351, 402, 433, 465, 314, , 318
ESP10, 305, 354, 403, 434, 465, 316, , 320
ESP10, 307, 358, 408, 436, 466, 318, , 322
ESP10, 306, 358, 408, 435, 465, 321, , 325
ESP10, 308, 359, 411, 436, 466, 323, , 327
ESP10, 309, 359, 414, 437, 466, 325, , 329
ESP10, 313, 365, 418, 442, 470, 327, , 331
ESP10, 316, 369, 422, 444, 472, 329, , 333
ESP10, 316, 367, 420, 441, 470, 331, , 335
ESP10, 315, 365, 418, 439, 469, 333, , 337
ESP10, 317, 367, 421, 441, 472, 336, , 340
ESP10, 314, 364, 420, 439, 469, 338, , 342
ESP10, 311, 363, 421, 438, 469, 340, , 344
ESP10, 315, 367, 425, 443, 474, 342, , 346
ESP10, 311, 363, 421, 442, 471, 344, , 348
ESP10, 310, 362, 420, 443, 470, 346, , 350
ESP10, 308, 361, 419, 442, 470, 348, , 352
ESP10, 311, 364, 421, 443, 474, 351, , 355
ESP10, 302, 356, 414, 434, 468, 353, , 357
ESP10, 303, 357, 417, 436, 470, 355, , 359
ESP10, 302, 354, 414, 435, 468, 357, , 361
ESP10, 297, 348, 406, 431, 463, 359, , 363
ESP10, 302, 351, 410, 435, 466, 361, , 365
ESP10, 308, 355, 419, 439, 471, 363, , 367
ESP10, 295, 342, 407, 426, 458, 366, , 370
ESP10, 301, 347, 411, 431, 462, 368, , 372
ESP10, 302, 345, 408, 430, 462, 370, , 374
ESP10, 308, 349, 412, 437, 469, 372, , 376
ESP10, 309, 352, 412, 441, 469, 374, , 378
ESP10, 315, 361, 419, 449, 474, 376, , 380
ESP10, 320, 367, 423, 454, 478, 378, , 382
ESP10, 324, 370, 424, 454, 478, 381, , 385
ESP10, 326, 368, 424, 452, 476, 383, , 387
ESP10, 324, 365, 422, 450, 475, 385, , 389
ESP10, 325, 363, 420, 448, 473, 387, , 391
ESP10, 329, 361, 421, 447, 475, 389, , 393
ESP10, 332, 362, 423, 449, 477, 391, , 395
ESP10, 328, 360, 420, 446, 474, 393, , 397
ESP10, 327, 357, 420, 444, 471, 396, , 400
ESP10, 317, 345, 412, 432, 459, 398, , 402
ESP10, 312, 341, 407, 428, 454, 400, , 404
ESP10, 311, 337, 402, 424, 452, 402, , 406
ESP10, 310, 338, 399, 424, 450, 404, , 408
ESP10, 306, 335, 394, 421, 447, 406, , 410
ESP10, 303, 333, 390, 422, 444, 408, , 412
ESP10, 308, 336, 396, 425, 447, 410, , 414
ESP10, 306, 333, 393, 421, 445, 413, , 417
ESP10, 300, 330, 386, 415, 438, 415, , 419
ESP10, 309, 340, 396, 427, 450, 417, , 421
ESP10, 307, 340, 397, 426, 452, 419, , 423
ESP10, 306, 341, 400, 427, 454, 421, , 425
ESP10, 300, 336, 395, 422, 450, 423, , 427
ESP10, 297, 334, 393, 420, 446, 425, , 429
ESP10, 302, 341, 397, 423, 449, 428, , 432
ESP10, 306, 348, 399, 426, 452, 430, , 434
ESP10, 315, 354, 400, 429, 452, 432, , 436
ESP10, 319, 355, 403, 429, 452, 434, , 438
ESP10, 325, 358, 404, 431, 455, 436, , 440
ESP10, 328, 358, 407, 430, 457, 438, , 442
ESP10, 326, 349, 401, 422, 449, 440, , 444
ESP10, 325, 351, 398, 420, 449, 443, , 447
ESP10, 332, 359, 404, 426, 455, 445, , 449
ESP10, 327, 357, 399, 421, 447, 447, , 451
ESP10, 335, 364, 406, 431, 453, 449, , 453
ESP10, 336, 362, 405, 434, 452, 451, , 455
ESP10, 340, 362, 406, 434, 454, 453, , 457
ESP10, 346, 369, 413, 439, 459, 455, , 459
ESP10, 349, 377, 416, 447, 462, 458, , 462
ESP10, 350, 379, 414, 447, 462, 460, , 464
ESP10, 359, 385, 422, 454, 468, 462, , 466
ESP10, 361, 384, 425, 456, 470, 464, , 468
ESP10, 362, 389, 426, 459, 473, 466, , 470
ESP10, 367, 395, 431, 463, 479, 468, , 472
ESP10, 371, 397, 434, 465, 483, 470, , 474
ESP10, 364, 390, 426, 458, 477, 473, , 477
ESP10, 358, 385, 419, 453, 472, 475, , 479
ESP10, 361, 384, 417, 451, 469, 477, , 481
ESP10, 357, 381, 412, 448, 465, 479, , 483
ESP10, 359, 380, 410, 446, 462, 481, , 485
ESP10, 364, 387, 413, 450, 465, 483, , 487
ESP10, 369, 390, 417, 449, 463, 485, , 489
ESP10, 376, 398, 425, 454, 468, 488, , 492
ESP10, 380, 407, 428, 457, 470, 490, , 494
ESP10, 380, 408, 433, 458, 472, 492, , 496
ESP10, 382, 411, 432, 457, 470, 494, , 498
ESP10, 382, 413, 432, 459, 469, 496, , 500
ESP10, 386, 415, 433, 460, 470, 498, , 502
ESP10, 386, 413, 431, 458, 468, 500, , 504
ESP10, 387, 415, 433, 459, 469, 503, , 507
ESP10, 388, 418, 436, 462, 471, 505, , 509
ESP10, 390, 423, 440, 462, 472, 507, , 511
ESP10, 390, 423, 440, 462, 471, 509, , 513
ESP10, 387, 423, 438, 459, 469, 511, , 515
ESP10, 390, 426, 440, 460, 470, 513, , 517
ESP10, 394, 429, 443, 461, 470, 515, , 519
ESP10, 396, 430, 445, 460, 470, 518, , 522
ESP10, 397, 431, 447, 460, 470, 520, , 524
ESP10, 399, 433, 449, 462, 472, 522, , 526
ESP10, 399, 434, 450, 466, 472, 524, , 528
ESP10, 403, 434, 450, 467, 472, 526, , 530
ESP10, 405, 435, 451, 468, 473, 528, , 532
ESP10, 411, 440, 459, 471, 475, 530, , 534
ESP10, 416, 440, 461, 471, 474, 533, , 537
ESP10, 416, 440, 462, 472, 475, 535, , 539
ESP10, 417, 440, 463, 472, 475, 537, , 541
ESP10, 419, 440, 464, 473, 476, 539, , 543
ESP10, 423, 444, 467, 476, 480, 541, , 545
ESP10, 426, 447, 471, 478, 483, 543, , 547
ESP10, 422, 446, 469, 478, 481, 545, , 549
ESP10, 417, 444, 464, 474, 477, 547, , 551
ESP10, 410, 437, 456, 467, 471, 550, , 554
ESP10, 416, 441, 459, 470, 474, 552, , 556
ESP10, 416, 442, 460, 470, 473, 554, , 558
ESP10, 414, 438, 457, 467, 471, 556, , 560
ESP10, 422, 440, 460, 469, 472, 558, , 562
ESP10, 429, 444, 462, 472, 475, 560, , 564
ESP10, 423, 437, 457, 468, 471, 562, , 566
ESP10, 430, 448, 459, 470, 473, 565, , 569
ESP10, 428, 445, 458, 469, 472, 567, , 571
ESP10, 434, 449, 464, 472, 475, 569, , 573
ESP10, 438, 455, 466, 473, 477, 571, , 575
ESP10, 440, 458, 466, 474, 477, 573, , 577
ESP10, 441, 457, 465, 473, 476, 575, , 579
ESP10, 443, 457, 466, 472, 475, 577, , 581
ESP10, 450, 461, 468, 474, 476, 580, , 584
ESP10, 451, 462, 467, 474, 476, 582, , 586
ESP10, 451, 461, 468, 472, 475, 584, , 588
ESP10, 453, 463, 469, 473, 475, 586, , 590
ESP10, 455, 465, 471, 474, 476, 588, , 592
ESP10, 456, 467, 472, 475, 476, 590, , 594
ESP10, 454, 466, 471, 474, 475, 592, , 596
ESP10, 451, 465, 469, 472, 473, 595, , 599
ESP10, 454, 467, 471, 474, 476, 597, , 601
ESP10, 451, 466, 469, 472, 473, 599, , 603
ESP10, 450, 463, 466, 468, 470, 601, , 605
ESP10, 451, 463, 465, 468, 469, 603, , 607
ESP10, 454, 464, 466, 468, 469, 605, , 609
ESP10, 455, 464, 466, 469, 469, 607, , 611
ESP10, 457, 466, 468, 470, 471, 610, , 614
ESP10, 458, 465, 467, 469, 470, 612, , 616
ESP10, 459, 465, 468, 469, 470, 614, , 618
ESP10, 459, 466, 468, 469, 470, 616, , 620
ESP10, 459, 466, 468, 470, 470, 618, , 622
ESP10, 460, 467, 469, 470, 471, 620, , 624
ESP10, 461, 467, 469, 470, 472, 622, , 626
ESP10, 460, 467, 469, 471, 472, 625, , 629
ESP10, 463, 468, 469, 471, 472, 627, , 631
ESP10, 463, 467, 469, 471, 472, 629, , 633
ESP10, 462, 466, 469, 470, 472, 631, , 635
ESP10, 462, 466, 468, 470, 471, 633, , 637
ESP10, 463, 467, 469, 471, 472, 635, , 639
ESP10, 462, 467, 468, 470, 472, 637, , 641
ESP10, 463, 468, 469, 471, 473, 640, , 644
ESP10, 465, 469, 471, 472, 474, 642, , 646
ESP10, 466, 469, 471, 473, 474, 644, , 648
ESP10, 465, 469, 470, 472, 473, 646, , 650
ESP10, 465, 468, 470, 472, 473, 648, , 652
ESP10, 465, 469, 470, 472, 473, 650, , 654
ESP10, 465, 469, 470, 472, 473, 652, , 656
ESP10, 465, 469, 470, 472, 473, 655, , 659
ESP10, 467, 469, 470, 472, 473, 657, , 661
ESP10, 467, 469, 470, 472, 473, 659, , 663
ESP10, 467, 469, 471, 472, 473, 661, , 665
ESP10, 467, 469, 471, 472, 473, 663, , 667
ESP10, 468, 469, 471, 472, 473, 665, , 669
ESP10, 468, 470, 471, 473, 473, 667, , 671
ESP10, 468, 470, 471, 473, 474, 670, , 674
ESP10, 468, 470, 471, 473, 474, 672, , 676
ESP10, 467, 469, 471, 472, 473, 674, , 678
ESP10, 467, 469, 471, 472, 474, 676, , 680
ESP10, 467, 469, 471, 472, 473, 678, , 682
ESP10, 467, 469, 471, 472, 474, 680, , 684
ESP10, 468, 470, 471, 473, 474, 682, , 686
ESP10, 468, 470, 472, 473, 474, 684, , 688
ESP10, 469, 471, 472, 474, 475, 687, , 691
ESP10, 468, 471, 472, 474, 475, 689, , 693
ESP10, 468, 470, 472, 473, 475, 691, , 695
ESP10, 469, 471, 472, 474, 475, 693, , 697
ESP10, 468, 470, 472, 474, 475, 695, , 699
ESP10, 469, 471, 472, 474, 475, 697, , 701
ESP10, 469, 471, 472, 474, 475, 699, , 703
ESP10, 469, 471, 472, 474, 475, 702, , 706
ESP10, 469, 471, 472, 474, 475, 704, , 708
ESP10, 469, 471, 473, 474, 475, 706, , 710
ESP10, 469, 471, 473, 474, 475, 708, , 712
ESP10, 469, 471, 473, 474, 476, 710, , 714
ESP10, 468, 471, 472, 474, 475, 712, , 716
ESP10, 469, 471, 473, 474, 475, 714, , 718
ESP10, 469, 471, 473, 474, 475, 717, , 721
ESP10, 469, 471, 473, 474, 475, 719, , 723
ESP10, 469, 471, 473, 474, 475, 721, , 725
ESP10, 469, 472, 473, 474, 475, 723, , 727
ESP10, 469, 472, 473, 474, 475, 725, , 729
ESP10, 469, 472, 473, 474, 475, 727, , 731
ESP10, 469, 472, 473, 474, 475, 729, , 733
ESP10, 469, 472, 473, 474, 475, 732, , 736
ESP10, 470, 472, 474, 475, 475, 734, , 738
Max Scale
Scale To Data
Scale To Last 45 Days
Show Min/Max Ensemble Volume
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ESP10
HEFS
ESP0
Data Files
/chpsesp/ensemble/natural/MYDW1N_SQIN.ESPF10.csv
MYDW1N_SQIN.ESPF0.csv|2026-08-08
MYDW1N_SQIN.ESPF10.csv|2026-08-08
MYDW1N_SQIN.ESPFM.csv|2026-08-08
APR-SEP
COWLITZ - MAYFIELD RESERVOIR
(
MYDW1
)
Forecasts for Water Year
2027
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-08-08
Issued:
2026-08-08
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
1301
1817
95
2410
1913
APR-JUL
1135
1625
97
2025
1682
APR-AUG
1217
1731
96
2197
1808
JAN-SEP
2544
3306
97
4110
3419
JAN-JUL
2406
3130
98
3833
3188
OCT-SEP
3451
4501
98
5566
4585
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/natural/MYDW1N_SQIN.ESPF10.csv
MYDW1N_SQIN.ESPF0.csv|2026-08-08
MYDW1N_SQIN.ESPF10.csv|2026-08-08
MYDW1N_SQIN.ESPFM.csv|2026-08-08
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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