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Water Year
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COWLITZ - MAYFIELD RESERVOIR
(
MYDW1
)
Forecasts for Water Year
2026
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
1101
1113
60
1137
1864
APR-JUL
902
902
55
902
1648
APR-AUG
999
1001
57
1002
1765
JAN-SEP
2714
2726
80
2750
3420
JAN-JUL
2515
2515
78
2515
3204
OCT-SEP
4657
4668
101
4693
4624
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
1100
1111
60
1136
1864
APR-JUL
902
902
55
902
1648
APR-AUG
997
999
57
1002
1765
JAN-SEP
2713
2724
80
2749
3420
JAN-JUL
2515
2515
78
2515
3204
OCT-SEP
4655
4667
101
4692
4624
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
1102
1115
60
1138
1864
APR-JUL
902
902
55
902
1648
APR-AUG
997
1000
57
1003
1765
JAN-SEP
2715
2728
80
2751
3420
JAN-JUL
2515
2515
78
2515
3204
OCT-SEP
4658
4671
101
4694
4624
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 246, 296, 343, 402, 434, 70, , 74
ESP10, 246, 295, 343, 402, 434, 72, , 76
ESP10, 246, 295, 343, 402, 434, 74, , 78
ESP10, 247, 295, 343, 402, 434, 76, , 80
ESP10, 247, 295, 343, 402, 434, 78, , 82
ESP10, 246, 295, 343, 402, 434, 81, , 85
ESP10, 245, 294, 342, 401, 433, 83, , 87
ESP10, 245, 295, 342, 401, 433, 85, , 89
ESP10, 246, 295, 343, 402, 434, 87, , 91
ESP10, 246, 295, 342, 402, 434, 89, , 93
ESP10, 246, 295, 342, 401, 434, 91, , 95
ESP10, 245, 294, 342, 401, 434, 93, , 97
ESP10, 245, 294, 342, 401, 434, 95, , 99
ESP10, 246, 294, 342, 402, 435, 97, , 101
ESP10, 237, 285, 332, 390, 423, 99, , 103
ESP10, 237, 284, 332, 389, 423, 102, , 106
ESP10, 232, 286, 334, 386, 421, 104, , 108
ESP10, 233, 281, 329, 389, 424, 106, , 110
ESP10, 233, 281, 330, 389, 425, 108, , 112
ESP10, 233, 282, 333, 390, 424, 110, , 114
ESP10, 231, 280, 328, 385, 422, 112, , 116
ESP10, 233, 283, 338, 391, 425, 114, , 118
ESP10, 233, 282, 338, 390, 425, 116, , 120
ESP10, 233, 288, 340, 390, 425, 118, , 122
ESP10, 233, 288, 340, 393, 425, 120, , 124
ESP10, 233, 286, 340, 393, 428, 122, , 126
ESP10, 234, 285, 340, 392, 426, 125, , 129
ESP10, 234, 289, 341, 394, 429, 127, , 131
ESP10, 234, 289, 342, 390, 426, 129, , 133
ESP10, 233, 285, 341, 389, 423, 131, , 135
ESP10, 230, 282, 339, 387, 421, 133, , 137
ESP10, 233, 284, 341, 388, 422, 135, , 139
ESP10, 234, 284, 340, 388, 422, 137, , 141
ESP10, 237, 286, 342, 390, 423, 139, , 143
ESP10, 237, 286, 341, 390, 422, 141, , 145
ESP10, 238, 290, 343, 390, 426, 143, , 147
ESP10, 237, 290, 342, 390, 426, 145, , 149
ESP10, 235, 288, 340, 388, 422, 148, , 152
ESP10, 234, 286, 337, 387, 420, 150, , 154
ESP10, 236, 286, 337, 387, 421, 152, , 156
ESP10, 240, 289, 340, 389, 423, 154, , 158
ESP10, 243, 290, 341, 389, 424, 156, , 160
ESP10, 241, 286, 338, 386, 421, 158, , 162
ESP10, 250, 294, 343, 394, 428, 160, , 164
ESP10, 252, 294, 345, 394, 427, 162, , 166
ESP10, 253, 293, 343, 393, 426, 164, , 168
ESP10, 255, 294, 344, 394, 427, 166, , 170
ESP10, 256, 297, 345, 397, 430, 169, , 173
ESP10, 256, 299, 345, 396, 429, 171, , 175
ESP10, 258, 299, 345, 396, 430, 173, , 177
ESP10, 260, 302, 346, 395, 428, 175, , 179
ESP10, 262, 306, 347, 398, 425, 177, , 181
ESP10, 261, 308, 348, 398, 426, 179, , 183
ESP10, 265, 312, 352, 402, 429, 181, , 185
ESP10, 263, 311, 351, 400, 428, 183, , 187
ESP10, 267, 314, 354, 401, 431, 185, , 189
ESP10, 267, 314, 354, 400, 429, 187, , 191
ESP10, 269, 314, 354, 401, 427, 189, , 193
ESP10, 270, 315, 355, 401, 423, 192, , 196
ESP10, 264, 311, 351, 396, 417, 194, , 198
ESP10, 272, 318, 356, 401, 425, 196, , 200
ESP10, 276, 322, 359, 404, 432, 198, , 202
ESP10, 275, 321, 359, 402, 435, 200, , 204
ESP10, 280, 328, 368, 407, 437, 202, , 206
ESP10, 288, 337, 375, 414, 445, 204, , 208
ESP10, 285, 336, 372, 413, 442, 206, , 210
ESP10, 292, 340, 376, 419, 449, 208, , 212
ESP10, 296, 340, 377, 420, 455, 210, , 214
ESP10, 299, 340, 379, 419, 456, 212, , 216
ESP10, 294, 335, 374, 415, 451, 215, , 219
ESP10, 282, 325, 363, 402, 438, 217, , 221
ESP10, 279, 323, 360, 399, 439, 219, , 223
ESP10, 277, 321, 360, 398, 440, 221, , 225
ESP10, 284, 326, 364, 403, 447, 223, , 227
ESP10, 285, 327, 364, 404, 447, 225, , 229
ESP10, 286, 327, 364, 405, 447, 227, , 231
ESP10, 279, 322, 358, 400, 444, 229, , 233
ESP10, 278, 324, 358, 400, 443, 231, , 235
ESP10, 277, 324, 357, 400, 443, 233, , 237
ESP10, 274, 323, 357, 398, 443, 236, , 240
ESP10, 284, 334, 367, 408, 451, 238, , 242
ESP10, 283, 335, 366, 407, 450, 240, , 244
ESP10, 289, 341, 376, 414, 456, 242, , 246
ESP10, 290, 341, 378, 414, 456, 244, , 248
ESP10, 287, 331, 379, 412, 451, 246, , 250
ESP10, 279, 326, 376, 408, 447, 248, , 252
ESP10, 283, 327, 381, 410, 451, 250, , 254
ESP10, 290, 330, 385, 412, 455, 252, , 256
ESP10, 288, 329, 385, 416, 454, 254, , 258
ESP10, 296, 335, 388, 417, 456, 256, , 260
ESP10, 300, 340, 392, 421, 458, 259, , 263
ESP10, 296, 337, 387, 417, 454, 261, , 265
ESP10, 293, 332, 384, 413, 451, 263, , 267
ESP10, 292, 329, 380, 411, 448, 265, , 269
ESP10, 291, 330, 378, 412, 447, 267, , 271
ESP10, 283, 322, 375, 409, 444, 269, , 273
ESP10, 282, 321, 374, 408, 445, 271, , 275
ESP10, 283, 321, 375, 411, 448, 273, , 277
ESP10, 289, 333, 377, 416, 451, 275, , 279
ESP10, 279, 322, 367, 406, 442, 277, , 281
ESP10, 280, 323, 368, 407, 444, 279, , 283
ESP10, 279, 322, 368, 407, 444, 282, , 286
ESP10, 279, 325, 371, 407, 446, 284, , 288
ESP10, 278, 326, 376, 406, 449, 286, , 290
ESP10, 281, 332, 380, 409, 453, 288, , 292
ESP10, 280, 330, 381, 407, 452, 290, , 294
ESP10, 276, 327, 375, 405, 449, 292, , 296
ESP10, 282, 331, 379, 410, 451, 294, , 298
ESP10, 285, 332, 380, 412, 454, 296, , 300
ESP10, 295, 339, 385, 419, 457, 298, , 302
ESP10, 295, 338, 382, 415, 455, 300, , 304
ESP10, 298, 339, 386, 417, 456, 303, , 307
ESP10, 300, 342, 390, 422, 457, 305, , 309
ESP10, 301, 344, 394, 426, 458, 307, , 311
ESP10, 305, 350, 401, 433, 462, 309, , 313
ESP10, 306, 357, 404, 436, 467, 311, , 315
ESP10, 307, 356, 405, 438, 464, 313, , 317
ESP10, 305, 352, 402, 435, 458, 315, , 319
ESP10, 308, 356, 407, 438, 461, 317, , 321
ESP10, 309, 358, 410, 438, 461, 319, , 323
ESP10, 314, 367, 419, 444, 472, 321, , 325
ESP10, 311, 360, 412, 436, 463, 323, , 327
ESP10, 312, 359, 411, 436, 461, 326, , 330
ESP10, 316, 367, 411, 441, 467, 328, , 332
ESP10, 318, 369, 416, 443, 471, 330, , 334
ESP10, 317, 366, 415, 439, 468, 332, , 336
ESP10, 313, 364, 414, 437, 468, 334, , 338
ESP10, 320, 367, 425, 444, 473, 336, , 340
ESP10, 320, 363, 423, 440, 468, 338, , 342
ESP10, 319, 362, 424, 442, 470, 340, , 344
ESP10, 316, 361, 422, 442, 470, 342, , 346
ESP10, 317, 364, 424, 444, 473, 344, , 348
ESP10, 307, 356, 416, 433, 463, 346, , 350
ESP10, 311, 357, 420, 436, 467, 349, , 353
ESP10, 313, 354, 415, 434, 464, 351, , 355
ESP10, 306, 346, 405, 429, 456, 353, , 357
ESP10, 312, 349, 412, 434, 462, 355, , 359
ESP10, 319, 354, 420, 441, 470, 357, , 361
ESP10, 301, 340, 406, 427, 458, 359, , 363
ESP10, 308, 347, 414, 433, 465, 361, , 365
ESP10, 306, 344, 408, 430, 461, 363, , 367
ESP10, 311, 349, 413, 436, 468, 365, , 369
ESP10, 317, 355, 415, 443, 468, 367, , 371
ESP10, 323, 363, 421, 451, 475, 370, , 374
ESP10, 329, 368, 426, 456, 480, 372, , 376
ESP10, 321, 361, 415, 447, 469, 374, , 378
ESP10, 325, 359, 415, 443, 467, 376, , 380
ESP10, 322, 356, 413, 440, 465, 378, , 382
ESP10, 320, 354, 411, 438, 464, 380, , 384
ESP10, 331, 363, 418, 448, 472, 382, , 386
ESP10, 334, 364, 426, 450, 478, 384, , 388
ESP10, 333, 363, 423, 447, 476, 386, , 390
ESP10, 318, 348, 411, 435, 462, 388, , 392
ESP10, 307, 336, 403, 423, 450, 390, , 394
ESP10, 306, 334, 405, 423, 447, 393, , 397
ESP10, 308, 331, 401, 421, 445, 395, , 399
ESP10, 306, 336, 397, 422, 444, 397, , 401
ESP10, 303, 334, 393, 420, 441, 399, , 403
ESP10, 298, 331, 388, 420, 435, 401, , 405
ESP10, 310, 339, 398, 428, 449, 403, , 407
ESP10, 297, 324, 383, 412, 435, 405, , 409
ESP10, 302, 329, 377, 405, 429, 407, , 411
ESP10, 311, 342, 399, 429, 453, 409, , 413
ESP10, 309, 343, 399, 428, 455, 411, , 415
ESP10, 308, 340, 401, 427, 456, 413, , 417
ESP10, 292, 328, 387, 414, 443, 416, , 420
ESP10, 289, 327, 387, 413, 440, 418, , 422
ESP10, 294, 334, 391, 418, 444, 420, , 424
ESP10, 301, 344, 395, 423, 448, 422, , 426
ESP10, 308, 347, 394, 424, 446, 424, , 428
ESP10, 312, 348, 395, 422, 444, 426, , 430
ESP10, 318, 351, 396, 424, 448, 428, , 432
ESP10, 323, 354, 403, 426, 453, 430, , 434
ESP10, 321, 344, 396, 417, 444, 432, , 436
ESP10, 321, 346, 393, 415, 444, 434, , 438
ESP10, 327, 354, 400, 420, 450, 437, , 441
ESP10, 321, 351, 393, 415, 441, 439, , 443
ESP10, 329, 358, 400, 425, 446, 441, , 445
ESP10, 330, 356, 398, 428, 445, 443, , 447
ESP10, 331, 353, 397, 425, 445, 445, , 449
ESP10, 338, 360, 404, 431, 450, 447, , 451
ESP10, 340, 369, 407, 438, 453, 449, , 453
ESP10, 341, 369, 405, 439, 453, 451, , 455
ESP10, 350, 376, 413, 445, 459, 453, , 457
ESP10, 353, 375, 416, 448, 461, 455, , 459
ESP10, 355, 380, 417, 451, 464, 457, , 461
ESP10, 359, 387, 423, 454, 471, 460, , 464
ESP10, 374, 399, 437, 468, 486, 462, , 466
ESP10, 366, 392, 428, 460, 479, 464, , 468
ESP10, 353, 376, 410, 444, 464, 466, , 470
ESP10, 357, 375, 408, 442, 460, 468, , 472
ESP10, 353, 373, 403, 440, 456, 470, , 474
ESP10, 355, 373, 401, 437, 453, 472, , 476
ESP10, 363, 380, 404, 441, 456, 474, , 478
ESP10, 361, 381, 408, 440, 454, 476, , 480
ESP10, 368, 389, 415, 445, 458, 478, , 482
ESP10, 371, 398, 419, 448, 460, 480, , 484
ESP10, 371, 399, 424, 449, 462, 483, , 487
ESP10, 373, 402, 423, 448, 461, 485, , 489
ESP10, 373, 404, 423, 450, 460, 487, , 491
ESP10, 380, 409, 424, 451, 461, 489, , 493
ESP10, 381, 407, 422, 449, 459, 491, , 495
ESP10, 377, 406, 424, 450, 460, 493, , 497
ESP10, 381, 409, 426, 452, 462, 495, , 499
ESP10, 389, 416, 431, 453, 462, 497, , 501
ESP10, 393, 424, 438, 458, 467, 499, , 503
ESP10, 390, 425, 436, 455, 464, 501, , 505
ESP10, 392, 426, 437, 455, 465, 504, , 508
ESP10, 395, 429, 440, 456, 465, 506, , 510
ESP10, 397, 428, 443, 456, 465, 508, , 512
ESP10, 399, 431, 446, 458, 467, 510, , 514
ESP10, 401, 433, 447, 460, 469, 512, , 516
ESP10, 402, 435, 449, 462, 468, 514, , 518
ESP10, 403, 435, 449, 464, 468, 516, , 520
ESP10, 406, 437, 450, 465, 468, 518, , 522
ESP10, 412, 440, 457, 467, 471, 520, , 524
ESP10, 416, 440, 460, 467, 471, 522, , 526
ESP10, 416, 441, 460, 467, 471, 524, , 528
ESP10, 417, 440, 460, 468, 471, 527, , 531
ESP10, 421, 441, 462, 469, 471, 529, , 533
ESP10, 425, 445, 465, 473, 475, 531, , 535
ESP10, 425, 445, 462, 470, 474, 533, , 537
ESP10, 421, 446, 461, 469, 472, 535, , 539
ESP10, 418, 443, 460, 471, 475, 537, , 541
ESP10, 411, 437, 454, 465, 469, 539, , 543
ESP10, 417, 441, 457, 468, 472, 541, , 545
ESP10, 407, 433, 451, 461, 464, 543, , 547
ESP10, 405, 429, 448, 458, 462, 545, , 549
ESP10, 418, 434, 452, 460, 463, 547, , 551
ESP10, 421, 435, 453, 463, 466, 550, , 554
ESP10, 417, 428, 448, 459, 461, 552, , 556
ESP10, 427, 443, 456, 463, 465, 554, , 558
ESP10, 426, 442, 455, 462, 465, 556, , 560
ESP10, 435, 445, 457, 465, 467, 558, , 562
ESP10, 438, 452, 460, 467, 469, 560, , 564
ESP10, 440, 455, 462, 466, 468, 562, , 566
ESP10, 441, 453, 461, 465, 467, 564, , 568
ESP10, 443, 453, 460, 464, 466, 566, , 570
ESP10, 451, 459, 466, 469, 471, 568, , 572
ESP10, 452, 460, 466, 470, 471, 571, , 575
ESP10, 454, 464, 471, 475, 478, 573, , 577
ESP10, 456, 466, 472, 476, 478, 575, , 579
ESP10, 458, 468, 473, 477, 478, 577, , 581
ESP10, 452, 458, 463, 466, 467, 579, , 583
ESP10, 454, 462, 466, 468, 469, 581, , 585
ESP10, 451, 462, 464, 466, 468, 583, , 587
ESP10, 454, 464, 467, 468, 470, 585, , 589
ESP10, 454, 469, 472, 475, 476, 587, , 591
ESP10, 453, 466, 468, 471, 472, 589, , 593
ESP10, 451, 458, 461, 462, 463, 591, , 595
ESP10, 453, 459, 461, 462, 464, 594, , 598
ESP10, 454, 461, 463, 464, 465, 596, , 600
ESP10, 456, 462, 464, 465, 466, 598, , 602
ESP10, 449, 456, 458, 460, 461, 600, , 604
ESP10, 450, 456, 459, 460, 461, 602, , 606
ESP10, 450, 457, 459, 460, 461, 604, , 608
ESP10, 451, 457, 459, 461, 461, 606, , 610
ESP10, 452, 458, 460, 461, 462, 608, , 612
ESP10, 452, 458, 460, 461, 463, 610, , 614
ESP10, 452, 458, 460, 462, 463, 612, , 616
ESP10, 460, 463, 464, 465, 466, 614, , 618
ESP10, 460, 463, 464, 465, 466, 617, , 621
ESP10, 459, 462, 463, 464, 465, 619, , 623
ESP10, 460, 462, 463, 464, 465, 621, , 625
ESP10, 461, 463, 464, 465, 466, 623, , 627
ESP10, 457, 460, 461, 462, 463, 625, , 629
ESP10, 458, 461, 462, 463, 464, 627, , 631
ESP10, 462, 464, 465, 466, 467, 629, , 633
ESP10, 461, 463, 464, 465, 466, 631, , 635
ESP10, 460, 462, 463, 464, 465, 633, , 637
ESP10, 460, 462, 463, 464, 465, 635, , 639
ESP10, 460, 462, 463, 464, 465, 638, , 642
ESP10, 468, 471, 473, 474, 476, 640, , 644
ESP10, 467, 469, 471, 471, 472, 642, , 646
ESP10, 468, 470, 471, 472, 473, 644, , 648
ESP10, 468, 470, 471, 472, 473, 646, , 650
ESP10, 468, 470, 471, 472, 473, 648, , 652
ESP10, 468, 470, 471, 472, 472, 650, , 654
ESP10, 469, 470, 471, 472, 473, 652, , 656
ESP10, 469, 471, 472, 473, 474, 654, , 658
ESP10, 469, 471, 472, 473, 474, 656, , 660
ESP10, 469, 471, 472, 473, 474, 658, , 662
ESP10, 468, 470, 471, 472, 473, 661, , 665
ESP10, 468, 470, 471, 472, 473, 663, , 667
ESP10, 468, 470, 471, 472, 473, 665, , 669
ESP10, 468, 470, 471, 472, 473, 667, , 671
ESP10, 469, 470, 471, 472, 473, 669, , 673
ESP10, 469, 471, 472, 473, 474, 671, , 675
ESP10, 470, 471, 473, 473, 474, 673, , 677
ESP10, 470, 471, 472, 473, 474, 675, , 679
ESP10, 470, 471, 472, 473, 474, 677, , 681
ESP10, 460, 462, 463, 465, 466, 679, , 683
ESP10, 470, 471, 472, 473, 474, 681, , 685
ESP10, 470, 472, 473, 474, 475, 684, , 688
ESP10, 472, 474, 475, 476, 477, 686, , 690
ESP10, 472, 474, 475, 477, 478, 688, , 692
ESP10, 472, 474, 475, 477, 478, 690, , 694
ESP10, 468, 469, 470, 471, 472, 692, , 696
ESP10, 471, 472, 473, 474, 475, 694, , 698
ESP10, 471, 472, 473, 474, 475, 696, , 700
ESP10, 470, 472, 472, 473, 474, 698, , 702
ESP10, 471, 472, 473, 474, 475, 700, , 704
ESP10, 471, 472, 473, 474, 475, 702, , 706
ESP10, 472, 474, 476, 477, 478, 705, , 709
ESP10, 472, 474, 476, 477, 478, 707, , 711
ESP10, 472, 475, 476, 477, 478, 709, , 713
ESP10, 472, 475, 476, 477, 478, 711, , 715
ESP10, 472, 475, 476, 478, 478, 713, , 717
ESP10, 472, 475, 476, 477, 478, 715, , 719
ESP10, 472, 475, 476, 477, 478, 717, , 721
ESP10, 473, 475, 477, 478, 478, 719, , 723
ESP10, 469, 470, 471, 472, 472, 721, , 725
ESP10, 469, 471, 472, 472, 473, 723, , 727
ESP10, 469, 470, 472, 472, 473, 725, , 729
ESP10, 461, 463, 465, 466, 467, 728, , 732
ESP10, 461, 463, 465, 466, 467, 730, , 734
ESP10, 461, 463, 465, 466, 467, 732, , 736
ESP10, 461, 463, 465, 466, 467, 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/watersupply/MYDW1W_SQIN.ESPF10.csv
MYDW1W_SQIN.ESPF0.csv|2026-08-15
MYDW1W_SQIN.ESPF10.csv|2026-08-15
MYDW1W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
COWLITZ - MAYFIELD RESERVOIR
(
MYDW1
)
Forecasts for Water Year
2027
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
1345
1888
101
2481
1864
APR-JUL
1185
1637
99
2039
1648
APR-AUG
1276
1780
101
2254
1765
JAN-SEP
2601
3319
97
4159
3420
JAN-JUL
2409
3158
99
3830
3204
OCT-SEP
3406
4498
97
5567
4624
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/MYDW1W_SQIN.ESPF10.csv
MYDW1W_SQIN.ESPF0.csv|2026-08-15
MYDW1W_SQIN.ESPF10.csv|2026-08-15
MYDW1W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
