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Archive:
Water Year
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COLUMBIA - WANAPUM DAM
(
WANW1
)
Forecasts for Water Year
2026
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-07-26
Issued:
2026-07-26
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
61360
61763
91
62557
68222
APR-JUL
51898
51898
90
51898
57709
APR-AUG
58039
58194
91
58486
64241
JAN-SEP
75449
75852
97
76646
77881
JAN-JUL
65987
65987
98
65987
67367
OCT-SEP
87217
87619
100
88414
87958
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-07-26
Issued:
2026-07-26
Hide Forecast
APR-SEP
61345
61799
91
62522
68222
APR-JUL
51892
51898
90
51904
57709
APR-AUG
58043
58246
91
58456
64241
JAN-SEP
75434
75887
97
76611
77881
JAN-JUL
65981
65987
98
65993
67367
OCT-SEP
87201
87655
100
88378
87958
Reference
ESP with 0 Days QPF
Ensemble:
2026-07-26
Issued:
2026-07-26
Hide Forecast
APR-SEP
61556
62047
91
63168
68222
APR-JUL
51891
51904
90
51917
57709
APR-AUG
58117
58406
91
58727
64241
JAN-SEP
75644
76136
98
77257
77881
JAN-JUL
65980
65993
98
66006
67367
OCT-SEP
87412
87904
100
89024
87958
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 224, 297, 352, 409, 435, 70, , 74
ESP10, 219, 295, 346, 404, 431, 72, , 76
ESP10, 222, 298, 351, 407, 436, 75, , 79
ESP10, 221, 298, 352, 405, 434, 77, , 81
ESP10, 222, 298, 353, 402, 432, 79, , 83
ESP10, 220, 296, 352, 398, 431, 81, , 85
ESP10, 225, 299, 353, 401, 436, 84, , 88
ESP10, 229, 302, 358, 402, 436, 86, , 90
ESP10, 230, 305, 359, 402, 437, 88, , 92
ESP10, 227, 307, 356, 400, 436, 90, , 94
ESP10, 227, 312, 359, 401, 437, 93, , 97
ESP10, 225, 312, 358, 402, 436, 95, , 99
ESP10, 219, 307, 352, 397, 432, 97, , 101
ESP10, 221, 308, 354, 401, 434, 99, , 103
ESP10, 221, 306, 351, 399, 434, 102, , 106
ESP10, 208, 297, 337, 389, 424, 104, , 108
ESP10, 198, 286, 329, 380, 414, 106, , 110
ESP10, 209, 296, 342, 393, 425, 108, , 112
ESP10, 210, 298, 346, 395, 428, 110, , 114
ESP10, 210, 299, 346, 397, 431, 113, , 117
ESP10, 200, 291, 337, 387, 421, 115, , 119
ESP10, 201, 291, 336, 391, 420, 117, , 121
ESP10, 194, 288, 331, 386, 420, 119, , 123
ESP10, 202, 297, 343, 392, 429, 122, , 126
ESP10, 207, 302, 348, 401, 432, 124, , 128
ESP10, 211, 308, 352, 406, 436, 126, , 130
ESP10, 213, 306, 352, 406, 436, 128, , 132
ESP10, 215, 308, 351, 406, 436, 131, , 135
ESP10, 205, 300, 343, 399, 428, 133, , 137
ESP10, 189, 287, 330, 387, 417, 135, , 139
ESP10, 188, 286, 332, 386, 421, 137, , 141
ESP10, 194, 292, 338, 388, 428, 139, , 143
ESP10, 190, 288, 337, 387, 427, 142, , 146
ESP10, 202, 299, 345, 400, 437, 144, , 148
ESP10, 208, 303, 347, 402, 438, 146, , 150
ESP10, 211, 303, 347, 400, 436, 148, , 152
ESP10, 213, 302, 346, 398, 437, 151, , 155
ESP10, 210, 295, 344, 389, 430, 153, , 157
ESP10, 216, 301, 351, 395, 438, 155, , 159
ESP10, 213, 300, 352, 390, 437, 157, , 161
ESP10, 214, 302, 351, 392, 438, 160, , 164
ESP10, 219, 302, 349, 396, 438, 162, , 166
ESP10, 230, 307, 361, 402, 445, 164, , 168
ESP10, 243, 312, 365, 403, 450, 166, , 170
ESP10, 237, 307, 357, 396, 441, 169, , 173
ESP10, 246, 312, 363, 402, 445, 171, , 175
ESP10, 238, 304, 354, 395, 439, 173, , 177
ESP10, 246, 310, 363, 400, 450, 175, , 179
ESP10, 241, 304, 358, 401, 446, 177, , 181
ESP10, 245, 310, 364, 402, 450, 180, , 184
ESP10, 246, 310, 364, 400, 448, 182, , 186
ESP10, 247, 315, 359, 399, 444, 184, , 188
ESP10, 244, 317, 357, 396, 439, 186, , 190
ESP10, 254, 326, 367, 407, 447, 189, , 193
ESP10, 250, 322, 362, 407, 444, 191, , 195
ESP10, 253, 318, 359, 408, 444, 193, , 197
ESP10, 251, 314, 355, 403, 439, 195, , 199
ESP10, 251, 312, 355, 403, 439, 198, , 202
ESP10, 252, 313, 361, 408, 441, 200, , 204
ESP10, 243, 303, 351, 400, 431, 202, , 206
ESP10, 232, 293, 341, 389, 421, 204, , 208
ESP10, 236, 294, 343, 392, 423, 206, , 210
ESP10, 229, 284, 337, 385, 414, 209, , 213
ESP10, 214, 262, 321, 365, 402, 211, , 215
ESP10, 214, 264, 326, 365, 407, 213, , 217
ESP10, 209, 261, 320, 360, 405, 215, , 219
ESP10, 220, 272, 330, 372, 419, 218, , 222
ESP10, 203, 257, 315, 358, 404, 220, , 224
ESP10, 176, 229, 286, 329, 377, 222, , 226
ESP10, 167, 227, 278, 319, 368, 224, , 228
ESP10, 167, 230, 280, 319, 369, 227, , 231
ESP10, 173, 242, 288, 326, 377, 229, , 233
ESP10, 174, 242, 293, 328, 378, 231, , 235
ESP10, 168, 234, 287, 321, 373, 233, , 237
ESP10, 174, 231, 290, 322, 372, 236, , 240
ESP10, 182, 231, 293, 322, 374, 238, , 242
ESP10, 184, 230, 299, 322, 377, 240, , 244
ESP10, 182, 226, 296, 318, 374, 242, , 246
ESP10, 178, 225, 291, 313, 368, 244, , 248
ESP10, 181, 227, 283, 307, 362, 247, , 251
ESP10, 194, 236, 289, 314, 367, 249, , 253
ESP10, 200, 234, 287, 312, 365, 251, , 255
ESP10, 213, 245, 298, 324, 376, 253, , 257
ESP10, 218, 249, 301, 333, 380, 256, , 260
ESP10, 213, 241, 296, 329, 375, 258, , 262
ESP10, 209, 236, 291, 327, 373, 260, , 264
ESP10, 211, 240, 293, 328, 376, 262, , 266
ESP10, 216, 245, 297, 332, 390, 265, , 269
ESP10, 212, 243, 293, 331, 388, 267, , 271
ESP10, 217, 246, 297, 332, 388, 269, , 273
ESP10, 224, 260, 304, 338, 390, 271, , 275
ESP10, 222, 257, 304, 335, 386, 273, , 277
ESP10, 215, 251, 303, 329, 382, 276, , 280
ESP10, 216, 254, 304, 331, 386, 278, , 282
ESP10, 207, 250, 297, 325, 380, 280, , 284
ESP10, 206, 262, 298, 329, 381, 282, , 286
ESP10, 206, 262, 301, 329, 382, 285, , 289
ESP10, 206, 261, 299, 332, 380, 287, , 291
ESP10, 208, 263, 300, 331, 378, 289, , 293
ESP10, 212, 263, 295, 333, 375, 291, , 295
ESP10, 210, 261, 294, 332, 372, 294, , 298
ESP10, 211, 260, 295, 333, 372, 296, , 300
ESP10, 210, 258, 294, 331, 368, 298, , 302
ESP10, 207, 257, 292, 328, 365, 300, , 304
ESP10, 214, 261, 291, 327, 365, 303, , 307
ESP10, 215, 261, 292, 325, 363, 305, , 309
ESP10, 212, 264, 290, 323, 363, 307, , 311
ESP10, 213, 266, 292, 327, 363, 309, , 313
ESP10, 215, 267, 294, 327, 364, 311, , 315
ESP10, 226, 279, 302, 337, 371, 314, , 318
ESP10, 233, 284, 305, 339, 372, 316, , 320
ESP10, 239, 291, 312, 346, 378, 318, , 322
ESP10, 238, 293, 316, 348, 378, 320, , 324
ESP10, 242, 297, 321, 351, 382, 323, , 327
ESP10, 242, 296, 322, 352, 382, 325, , 329
ESP10, 238, 292, 317, 347, 375, 327, , 331
ESP10, 242, 296, 319, 352, 379, 329, , 333
ESP10, 243, 299, 321, 354, 380, 332, , 336
ESP10, 249, 301, 321, 356, 383, 334, , 338
ESP10, 248, 302, 321, 355, 385, 336, , 340
ESP10, 246, 302, 323, 354, 385, 338, , 342
ESP10, 240, 296, 314, 344, 380, 340, , 344
ESP10, 234, 289, 307, 336, 375, 343, , 347
ESP10, 243, 291, 310, 338, 378, 345, , 349
ESP10, 245, 291, 311, 339, 381, 347, , 351
ESP10, 243, 289, 311, 337, 379, 349, , 353
ESP10, 242, 286, 306, 334, 374, 352, , 356
ESP10, 251, 296, 316, 339, 381, 354, , 358
ESP10, 252, 294, 312, 339, 377, 356, , 360
ESP10, 250, 293, 313, 343, 375, 358, , 362
ESP10, 254, 296, 316, 344, 375, 361, , 365
ESP10, 258, 299, 322, 345, 374, 363, , 367
ESP10, 253, 293, 318, 337, 367, 365, , 369
ESP10, 256, 297, 320, 338, 369, 367, , 371
ESP10, 253, 298, 317, 338, 366, 370, , 374
ESP10, 241, 286, 303, 328, 352, 372, , 376
ESP10, 243, 286, 303, 329, 352, 374, , 378
ESP10, 249, 293, 311, 335, 358, 376, , 380
ESP10, 237, 281, 302, 323, 346, 378, , 382
ESP10, 249, 289, 314, 332, 357, 381, , 385
ESP10, 245, 284, 307, 327, 350, 383, , 387
ESP10, 253, 290, 313, 332, 357, 385, , 389
ESP10, 254, 287, 310, 331, 355, 387, , 391
ESP10, 266, 294, 317, 340, 363, 390, , 394
ESP10, 271, 296, 318, 343, 365, 392, , 396
ESP10, 275, 298, 320, 345, 367, 394, , 398
ESP10, 275, 299, 323, 344, 366, 396, , 400
ESP10, 270, 296, 316, 339, 361, 399, , 403
ESP10, 265, 292, 313, 332, 356, 401, , 405
ESP10, 258, 284, 306, 322, 346, 403, , 407
ESP10, 262, 288, 307, 323, 346, 405, , 409
ESP10, 260, 283, 305, 321, 341, 407, , 411
ESP10, 253, 277, 297, 313, 332, 410, , 414
ESP10, 248, 271, 296, 307, 328, 412, , 416
ESP10, 242, 267, 289, 301, 323, 414, , 418
ESP10, 241, 269, 285, 303, 321, 416, , 420
ESP10, 231, 259, 272, 293, 310, 419, , 423
ESP10, 234, 260, 273, 295, 312, 421, , 425
ESP10, 216, 245, 257, 278, 298, 423, , 427
ESP10, 233, 261, 274, 292, 311, 425, , 429
ESP10, 232, 262, 275, 292, 312, 428, , 432
ESP10, 227, 258, 270, 288, 308, 430, , 434
ESP10, 225, 253, 262, 283, 300, 432, , 436
ESP10, 230, 258, 268, 289, 306, 434, , 438
ESP10, 227, 253, 263, 284, 305, 437, , 441
ESP10, 224, 248, 260, 278, 302, 439, , 443
ESP10, 219, 243, 255, 272, 299, 441, , 445
ESP10, 221, 245, 258, 276, 301, 443, , 447
ESP10, 219, 243, 257, 278, 298, 445, , 449
ESP10, 223, 243, 258, 279, 300, 448, , 452
ESP10, 225, 242, 257, 276, 297, 450, , 454
ESP10, 232, 245, 261, 278, 301, 452, , 456
ESP10, 231, 244, 259, 275, 298, 454, , 458
ESP10, 221, 237, 251, 268, 289, 457, , 461
ESP10, 217, 235, 250, 266, 286, 459, , 463
ESP10, 221, 240, 256, 273, 292, 461, , 465
ESP10, 220, 242, 256, 274, 292, 463, , 467
ESP10, 222, 246, 261, 278, 296, 466, , 470
ESP10, 224, 251, 265, 284, 300, 468, , 472
ESP10, 228, 255, 270, 288, 303, 470, , 474
ESP10, 236, 261, 276, 297, 309, 472, , 476
ESP10, 238, 264, 276, 297, 310, 474, , 478
ESP10, 237, 264, 276, 295, 309, 477, , 481
ESP10, 241, 270, 283, 299, 315, 479, , 483
ESP10, 239, 269, 286, 301, 315, 481, , 485
ESP10, 236, 266, 284, 300, 315, 483, , 487
ESP10, 237, 268, 284, 302, 315, 486, , 490
ESP10, 239, 274, 290, 305, 318, 488, , 492
ESP10, 238, 273, 287, 303, 317, 490, , 494
ESP10, 234, 267, 280, 297, 309, 492, , 496
ESP10, 231, 264, 278, 294, 305, 495, , 499
ESP10, 230, 264, 278, 294, 305, 497, , 501
ESP10, 234, 268, 283, 300, 311, 499, , 503
ESP10, 239, 271, 285, 302, 313, 501, , 505
ESP10, 237, 273, 282, 300, 309, 504, , 508
ESP10, 246, 280, 287, 306, 315, 506, , 510
ESP10, 249, 277, 286, 304, 313, 508, , 512
ESP10, 252, 280, 290, 307, 315, 510, , 514
ESP10, 248, 274, 287, 303, 310, 512, , 516
ESP10, 250, 276, 290, 306, 312, 515, , 519
ESP10, 252, 278, 293, 308, 315, 517, , 521
ESP10, 254, 280, 295, 311, 318, 519, , 523
ESP10, 257, 282, 298, 315, 320, 521, , 525
ESP10, 266, 291, 307, 323, 331, 524, , 528
ESP10, 266, 289, 306, 321, 331, 526, , 530
ESP10, 268, 291, 307, 322, 332, 528, , 532
ESP10, 268, 294, 306, 321, 333, 530, , 534
ESP10, 266, 292, 305, 319, 332, 533, , 537
ESP10, 268, 298, 309, 321, 333, 535, , 539
ESP10, 266, 297, 309, 320, 332, 537, , 541
ESP10, 267, 298, 309, 320, 332, 539, , 543
ESP10, 273, 302, 313, 326, 337, 541, , 545
ESP10, 276, 306, 318, 329, 341, 544, , 548
ESP10, 277, 306, 319, 332, 341, 546, , 550
ESP10, 278, 305, 319, 332, 340, 548, , 552
ESP10, 280, 304, 318, 331, 337, 550, , 554
ESP10, 284, 304, 321, 333, 337, 553, , 557
ESP10, 283, 304, 321, 333, 338, 555, , 559
ESP10, 283, 302, 320, 332, 340, 557, , 561
ESP10, 284, 304, 320, 332, 340, 559, , 563
ESP10, 286, 305, 321, 333, 340, 562, , 566
ESP10, 287, 304, 318, 332, 338, 564, , 568
ESP10, 288, 304, 317, 329, 335, 566, , 570
ESP10, 287, 305, 318, 329, 336, 568, , 572
ESP10, 285, 302, 316, 328, 333, 571, , 575
ESP10, 288, 301, 319, 328, 336, 573, , 577
ESP10, 290, 299, 319, 327, 335, 575, , 579
ESP10, 291, 302, 321, 329, 336, 577, , 581
ESP10, 294, 306, 322, 332, 339, 579, , 583
ESP10, 299, 310, 327, 336, 344, 582, , 586
ESP10, 294, 306, 324, 331, 339, 584, , 588
ESP10, 292, 304, 320, 329, 336, 586, , 590
ESP10, 296, 310, 321, 328, 336, 588, , 592
ESP10, 292, 308, 319, 326, 332, 591, , 595
ESP10, 293, 308, 318, 327, 333, 593, , 597
ESP10, 289, 303, 317, 322, 330, 595, , 599
ESP10, 290, 303, 315, 322, 329, 597, , 601
ESP10, 293, 305, 314, 323, 329, 600, , 604
ESP10, 295, 307, 318, 325, 333, 602, , 606
ESP10, 289, 300, 312, 319, 326, 604, , 608
ESP10, 292, 301, 314, 322, 328, 606, , 610
ESP10, 292, 300, 313, 321, 328, 608, , 612
ESP10, 293, 300, 313, 321, 329, 611, , 615
ESP10, 295, 302, 315, 324, 330, 613, , 617
ESP10, 295, 302, 312, 324, 329, 615, , 619
ESP10, 296, 305, 315, 323, 330, 617, , 621
ESP10, 302, 311, 319, 328, 335, 620, , 624
ESP10, 305, 315, 322, 332, 337, 622, , 626
ESP10, 305, 316, 322, 332, 339, 624, , 628
ESP10, 304, 315, 324, 331, 337, 626, , 630
ESP10, 311, 324, 331, 338, 345, 629, , 633
ESP10, 312, 325, 334, 341, 345, 631, , 635
ESP10, 320, 330, 339, 346, 351, 633, , 637
ESP10, 321, 327, 337, 344, 349, 635, , 639
ESP10, 323, 328, 336, 344, 348, 638, , 642
ESP10, 325, 331, 339, 346, 349, 640, , 644
ESP10, 326, 332, 340, 347, 351, 642, , 646
ESP10, 324, 331, 338, 345, 350, 644, , 648
ESP10, 324, 331, 339, 345, 349, 646, , 650
ESP10, 327, 334, 342, 347, 352, 649, , 653
ESP10, 328, 337, 343, 350, 353, 651, , 655
ESP10, 326, 335, 342, 348, 352, 653, , 657
ESP10, 327, 338, 344, 349, 354, 655, , 659
ESP10, 323, 333, 340, 345, 352, 658, , 662
ESP10, 334, 342, 349, 353, 360, 660, , 664
ESP10, 334, 342, 348, 353, 359, 662, , 666
ESP10, 334, 343, 348, 353, 358, 664, , 668
ESP10, 330, 338, 345, 349, 354, 667, , 671
ESP10, 331, 339, 345, 348, 354, 669, , 673
ESP10, 327, 336, 342, 345, 350, 671, , 675
ESP10, 332, 339, 345, 349, 354, 673, , 677
ESP10, 336, 342, 348, 353, 356, 675, , 679
ESP10, 336, 340, 347, 351, 354, 678, , 682
ESP10, 336, 341, 347, 351, 353, 680, , 684
ESP10, 335, 340, 346, 351, 353, 682, , 686
ESP10, 337, 343, 349, 353, 355, 684, , 688
ESP10, 345, 348, 352, 356, 358, 687, , 691
ESP10, 345, 348, 353, 356, 358, 689, , 693
ESP10, 346, 348, 352, 356, 357, 691, , 695
ESP10, 346, 349, 352, 355, 357, 693, , 697
ESP10, 346, 349, 353, 356, 358, 696, , 700
ESP10, 346, 350, 354, 356, 357, 698, , 702
ESP10, 346, 349, 353, 356, 357, 700, , 704
ESP10, 345, 349, 352, 355, 356, 702, , 706
ESP10, 343, 348, 352, 354, 355, 705, , 709
ESP10, 345, 350, 353, 355, 357, 707, , 711
ESP10, 344, 350, 353, 355, 356, 709, , 713
ESP10, 345, 350, 353, 355, 356, 711, , 715
ESP10, 346, 351, 353, 355, 356, 713, , 717
ESP10, 347, 351, 353, 356, 357, 716, , 720
ESP10, 347, 351, 353, 356, 357, 718, , 722
ESP10, 346, 351, 353, 355, 356, 720, , 724
ESP10, 346, 351, 353, 355, 356, 722, , 726
ESP10, 347, 351, 353, 355, 356, 725, , 729
ESP10, 347, 351, 353, 355, 356, 727, , 731
ESP10, 347, 351, 353, 355, 356, 729, , 733
ESP10, 348, 351, 354, 356, 357, 731, , 735
ESP10, 349, 352, 354, 356, 357, 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/WANW1N_SQIN.ESPF10.csv
WANW1N_SQIN.ESPF0.csv|2026-07-26
WANW1N_SQIN.ESPF10.csv|2026-07-26
WANW1N_SQIN.ESPFM.csv|2026-07-26
APR-SEP
COLUMBIA - WANAPUM DAM
(
WANW1
)
Forecasts for Water Year
2027
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-07-26
Issued:
2026-07-26
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
51427
64846
95
83764
68222
APR-JUL
41587
51638
89
66709
57709
APR-AUG
48244
59970
93
78121
64241
JAN-SEP
57949
73223
94
93116
77881
JAN-JUL
48372
60844
90
75271
67367
OCT-SEP
65737
82091
93
103159
87958
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/WANW1N_SQIN.ESPF10.csv
WANW1N_SQIN.ESPF0.csv|2026-07-26
WANW1N_SQIN.ESPF10.csv|2026-07-26
WANW1N_SQIN.ESPFM.csv|2026-07-26
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
