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Water Year
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COLUMBIA - BLO PRIEST RAPIDS DAM
(
PRDW1
)
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
60282
60573
89
61167
68162
APR-JUL
53637
53637
91
53637
58905
APR-AUG
57734
57819
89
57909
64656
JAN-SEP
75993
76285
97
76878
78616
JAN-JUL
69348
69348
100
69348
69359
OCT-SEP
88941
89232
101
89825
88197
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
60398
60653
89
61063
68162
APR-JUL
53637
53637
91
53637
58905
APR-AUG
57798
57894
90
58024
64656
JAN-SEP
76109
76364
97
76774
78616
JAN-JUL
69348
69348
100
69348
69359
OCT-SEP
89056
89311
101
89722
88197
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
60380
60648
89
61257
68162
APR-JUL
53637
53637
91
53637
58905
APR-AUG
57721
57838
89
58051
64656
JAN-SEP
76092
76360
97
76968
78616
JAN-JUL
69348
69348
100
69348
69359
OCT-SEP
89039
89307
101
89915
88197
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 224, 298, 354, 411, 437, 70, , 74
ESP10, 219, 296, 348, 406, 432, 72, , 76
ESP10, 223, 303, 353, 409, 437, 74, , 78
ESP10, 222, 304, 353, 407, 436, 76, , 80
ESP10, 223, 302, 353, 404, 433, 78, , 82
ESP10, 221, 300, 353, 402, 433, 81, , 85
ESP10, 227, 303, 353, 403, 436, 83, , 87
ESP10, 230, 306, 358, 405, 437, 85, , 89
ESP10, 231, 308, 360, 406, 438, 87, , 91
ESP10, 228, 309, 357, 404, 437, 89, , 93
ESP10, 228, 315, 360, 406, 437, 91, , 95
ESP10, 226, 317, 359, 407, 437, 93, , 97
ESP10, 220, 310, 352, 401, 432, 95, , 99
ESP10, 222, 312, 355, 406, 435, 97, , 101
ESP10, 223, 310, 352, 402, 434, 99, , 103
ESP10, 209, 299, 338, 390, 425, 102, , 106
ESP10, 199, 290, 329, 381, 414, 104, , 108
ESP10, 209, 300, 343, 393, 425, 106, , 110
ESP10, 210, 301, 347, 396, 428, 108, , 112
ESP10, 210, 301, 347, 398, 431, 110, , 114
ESP10, 200, 292, 339, 389, 421, 112, , 116
ESP10, 201, 292, 339, 395, 420, 114, , 118
ESP10, 193, 289, 333, 390, 419, 116, , 120
ESP10, 202, 298, 345, 400, 428, 118, , 122
ESP10, 206, 302, 350, 406, 431, 120, , 124
ESP10, 211, 311, 355, 410, 435, 122, , 126
ESP10, 213, 308, 355, 408, 435, 125, , 129
ESP10, 214, 311, 354, 409, 436, 127, , 131
ESP10, 204, 305, 345, 403, 427, 129, , 133
ESP10, 189, 293, 332, 391, 416, 131, , 135
ESP10, 188, 292, 335, 390, 420, 133, , 137
ESP10, 193, 295, 340, 398, 427, 135, , 139
ESP10, 190, 293, 338, 394, 428, 137, , 141
ESP10, 201, 306, 348, 403, 437, 139, , 143
ESP10, 209, 307, 349, 403, 438, 141, , 145
ESP10, 210, 305, 350, 402, 436, 143, , 147
ESP10, 213, 303, 349, 399, 438, 145, , 149
ESP10, 209, 297, 344, 391, 430, 148, , 152
ESP10, 216, 303, 352, 396, 437, 150, , 154
ESP10, 212, 304, 355, 391, 437, 152, , 156
ESP10, 215, 306, 354, 393, 438, 154, , 158
ESP10, 220, 306, 353, 398, 437, 156, , 160
ESP10, 232, 312, 363, 404, 444, 158, , 162
ESP10, 245, 317, 369, 406, 450, 160, , 164
ESP10, 239, 312, 361, 399, 440, 162, , 166
ESP10, 248, 318, 366, 404, 446, 164, , 168
ESP10, 240, 310, 357, 396, 440, 166, , 170
ESP10, 248, 315, 366, 401, 449, 169, , 173
ESP10, 243, 309, 361, 400, 446, 171, , 175
ESP10, 247, 313, 366, 401, 449, 173, , 177
ESP10, 248, 313, 366, 400, 449, 175, , 179
ESP10, 249, 317, 362, 399, 447, 177, , 181
ESP10, 246, 318, 362, 397, 442, 179, , 183
ESP10, 256, 329, 371, 409, 450, 181, , 185
ESP10, 252, 322, 366, 408, 447, 183, , 187
ESP10, 255, 320, 363, 408, 446, 185, , 189
ESP10, 252, 315, 358, 403, 442, 187, , 191
ESP10, 252, 313, 359, 404, 440, 189, , 193
ESP10, 253, 316, 365, 410, 442, 192, , 196
ESP10, 245, 305, 354, 401, 432, 194, , 198
ESP10, 233, 294, 344, 390, 423, 196, , 200
ESP10, 238, 298, 346, 393, 429, 198, , 202
ESP10, 230, 289, 341, 387, 420, 200, , 204
ESP10, 215, 269, 322, 366, 408, 202, , 206
ESP10, 216, 271, 327, 366, 412, 204, , 208
ESP10, 211, 266, 322, 360, 407, 206, , 210
ESP10, 222, 277, 333, 373, 419, 208, , 212
ESP10, 205, 260, 319, 358, 405, 210, , 214
ESP10, 177, 233, 289, 330, 382, 212, , 216
ESP10, 169, 227, 283, 319, 373, 215, , 219
ESP10, 168, 230, 284, 319, 373, 217, , 221
ESP10, 175, 242, 293, 327, 382, 219, , 223
ESP10, 175, 242, 298, 329, 386, 221, , 225
ESP10, 170, 234, 292, 322, 378, 223, , 227
ESP10, 175, 231, 293, 322, 377, 225, , 229
ESP10, 183, 231, 298, 323, 380, 227, , 231
ESP10, 184, 231, 302, 322, 384, 229, , 233
ESP10, 182, 231, 299, 319, 381, 231, , 235
ESP10, 177, 226, 294, 315, 376, 233, , 237
ESP10, 179, 227, 286, 309, 369, 236, , 240
ESP10, 192, 236, 293, 317, 374, 238, , 242
ESP10, 199, 236, 291, 316, 373, 240, , 244
ESP10, 212, 246, 300, 327, 383, 242, , 246
ESP10, 217, 250, 303, 336, 387, 244, , 248
ESP10, 212, 242, 300, 331, 382, 246, , 250
ESP10, 208, 237, 296, 328, 381, 248, , 252
ESP10, 213, 241, 297, 330, 383, 250, , 254
ESP10, 219, 247, 300, 335, 395, 252, , 256
ESP10, 216, 246, 297, 337, 394, 254, , 258
ESP10, 218, 248, 299, 338, 393, 256, , 260
ESP10, 224, 262, 307, 344, 396, 259, , 263
ESP10, 223, 261, 306, 341, 392, 261, , 265
ESP10, 219, 256, 305, 335, 388, 263, , 267
ESP10, 220, 259, 308, 336, 389, 265, , 269
ESP10, 212, 256, 300, 329, 384, 267, , 271
ESP10, 210, 264, 301, 330, 385, 269, , 273
ESP10, 211, 264, 303, 330, 386, 271, , 275
ESP10, 210, 267, 300, 333, 384, 273, , 277
ESP10, 212, 270, 300, 333, 380, 275, , 279
ESP10, 215, 267, 296, 335, 376, 277, , 281
ESP10, 213, 264, 294, 335, 374, 279, , 283
ESP10, 214, 263, 297, 335, 373, 282, , 286
ESP10, 213, 262, 295, 333, 370, 284, , 288
ESP10, 211, 260, 295, 331, 366, 286, , 290
ESP10, 215, 264, 294, 331, 369, 288, , 292
ESP10, 213, 264, 295, 328, 368, 290, , 294
ESP10, 211, 267, 294, 326, 367, 292, , 296
ESP10, 212, 269, 297, 328, 368, 294, , 298
ESP10, 213, 269, 297, 329, 372, 296, , 300
ESP10, 224, 281, 307, 338, 379, 298, , 302
ESP10, 232, 285, 310, 341, 381, 300, , 304
ESP10, 237, 292, 317, 348, 387, 303, , 307
ESP10, 237, 296, 319, 350, 387, 305, , 309
ESP10, 241, 299, 324, 354, 391, 307, , 311
ESP10, 241, 298, 326, 353, 391, 309, , 313
ESP10, 237, 294, 319, 348, 384, 311, , 315
ESP10, 241, 302, 322, 352, 387, 313, , 317
ESP10, 245, 304, 324, 354, 391, 315, , 319
ESP10, 248, 305, 326, 356, 395, 317, , 321
ESP10, 247, 307, 325, 356, 396, 319, , 323
ESP10, 249, 306, 325, 355, 396, 321, , 325
ESP10, 240, 300, 317, 345, 389, 323, , 327
ESP10, 234, 292, 309, 338, 381, 326, , 330
ESP10, 244, 295, 314, 340, 384, 328, , 332
ESP10, 252, 295, 316, 340, 385, 330, , 334
ESP10, 250, 294, 315, 339, 384, 332, , 336
ESP10, 247, 291, 311, 337, 380, 334, , 338
ESP10, 258, 300, 318, 343, 387, 336, , 340
ESP10, 259, 297, 316, 342, 383, 338, , 342
ESP10, 257, 296, 318, 345, 381, 340, , 344
ESP10, 260, 300, 319, 346, 381, 342, , 346
ESP10, 263, 303, 323, 347, 380, 344, , 348
ESP10, 258, 297, 319, 338, 373, 346, , 350
ESP10, 262, 299, 321, 341, 375, 349, , 353
ESP10, 259, 301, 319, 341, 371, 351, , 355
ESP10, 247, 290, 305, 329, 358, 353, , 357
ESP10, 249, 290, 307, 332, 358, 355, , 359
ESP10, 255, 297, 314, 339, 363, 357, , 361
ESP10, 243, 285, 306, 327, 352, 359, , 363
ESP10, 253, 293, 316, 335, 361, 361, , 365
ESP10, 249, 285, 308, 329, 358, 363, , 367
ESP10, 257, 292, 315, 335, 363, 365, , 369
ESP10, 254, 288, 312, 334, 360, 367, , 371
ESP10, 268, 295, 320, 342, 367, 370, , 374
ESP10, 273, 298, 320, 345, 368, 372, , 376
ESP10, 278, 301, 324, 347, 370, 374, , 378
ESP10, 279, 302, 324, 347, 370, 376, , 380
ESP10, 273, 297, 318, 342, 364, 378, , 382
ESP10, 269, 295, 317, 336, 359, 380, , 384
ESP10, 261, 286, 307, 327, 350, 382, , 386
ESP10, 263, 289, 309, 327, 349, 384, , 388
ESP10, 261, 286, 308, 323, 345, 386, , 390
ESP10, 253, 281, 301, 315, 336, 388, , 392
ESP10, 250, 275, 299, 309, 332, 390, , 394
ESP10, 245, 270, 291, 306, 326, 393, , 397
ESP10, 243, 273, 287, 308, 324, 395, , 399
ESP10, 234, 264, 275, 297, 314, 397, , 401
ESP10, 238, 266, 276, 298, 317, 399, , 403
ESP10, 221, 249, 261, 284, 303, 401, , 405
ESP10, 237, 264, 274, 296, 316, 403, , 407
ESP10, 237, 267, 277, 298, 317, 405, , 409
ESP10, 232, 261, 273, 294, 312, 407, , 411
ESP10, 230, 259, 268, 292, 307, 409, , 413
ESP10, 236, 264, 272, 296, 314, 411, , 415
ESP10, 232, 259, 270, 290, 311, 413, , 417
ESP10, 230, 255, 266, 286, 308, 416, , 420
ESP10, 225, 249, 261, 279, 305, 418, , 422
ESP10, 227, 252, 265, 282, 307, 420, , 424
ESP10, 226, 249, 264, 284, 306, 422, , 426
ESP10, 230, 250, 266, 286, 305, 424, , 428
ESP10, 234, 250, 266, 284, 304, 426, , 430
ESP10, 242, 254, 270, 287, 308, 428, , 432
ESP10, 243, 256, 270, 285, 308, 430, , 434
ESP10, 233, 247, 263, 278, 300, 432, , 436
ESP10, 229, 245, 261, 275, 297, 434, , 438
ESP10, 232, 250, 267, 283, 302, 437, , 441
ESP10, 231, 251, 267, 284, 302, 439, , 443
ESP10, 232, 254, 271, 290, 305, 441, , 445
ESP10, 235, 261, 276, 295, 309, 443, , 447
ESP10, 239, 264, 279, 298, 313, 445, , 449
ESP10, 247, 271, 285, 307, 320, 447, , 451
ESP10, 249, 275, 284, 307, 320, 449, , 453
ESP10, 247, 275, 284, 304, 318, 451, , 455
ESP10, 251, 280, 291, 308, 324, 453, , 457
ESP10, 250, 279, 293, 310, 324, 455, , 459
ESP10, 246, 275, 292, 310, 324, 457, , 461
ESP10, 247, 276, 293, 312, 323, 460, , 464
ESP10, 250, 282, 300, 315, 327, 462, , 466
ESP10, 249, 281, 296, 313, 326, 464, , 468
ESP10, 244, 275, 289, 308, 318, 466, , 470
ESP10, 241, 271, 287, 304, 314, 468, , 472
ESP10, 240, 271, 287, 304, 314, 470, , 474
ESP10, 244, 275, 292, 309, 320, 472, , 476
ESP10, 249, 278, 294, 311, 322, 474, , 478
ESP10, 247, 279, 291, 308, 318, 476, , 480
ESP10, 255, 287, 297, 314, 324, 478, , 482
ESP10, 258, 284, 295, 312, 322, 480, , 484
ESP10, 262, 287, 298, 315, 324, 483, , 487
ESP10, 257, 283, 295, 310, 320, 485, , 489
ESP10, 259, 285, 296, 313, 321, 487, , 491
ESP10, 261, 287, 300, 317, 325, 489, , 493
ESP10, 264, 289, 303, 319, 327, 491, , 495
ESP10, 265, 290, 306, 321, 329, 493, , 497
ESP10, 275, 299, 315, 330, 340, 495, , 499
ESP10, 274, 296, 314, 328, 339, 497, , 501
ESP10, 276, 297, 313, 329, 340, 499, , 503
ESP10, 275, 301, 313, 328, 341, 501, , 505
ESP10, 273, 300, 313, 324, 338, 504, , 508
ESP10, 275, 304, 316, 327, 339, 506, , 510
ESP10, 274, 305, 315, 326, 338, 508, , 512
ESP10, 274, 305, 316, 326, 338, 510, , 514
ESP10, 280, 309, 321, 332, 343, 512, , 516
ESP10, 283, 313, 325, 336, 347, 514, , 518
ESP10, 284, 314, 326, 339, 347, 516, , 520
ESP10, 284, 312, 326, 338, 346, 518, , 522
ESP10, 286, 310, 323, 337, 343, 520, , 524
ESP10, 290, 311, 326, 339, 343, 522, , 526
ESP10, 289, 310, 325, 338, 342, 524, , 528
ESP10, 289, 308, 324, 337, 344, 527, , 531
ESP10, 291, 309, 325, 337, 345, 529, , 533
ESP10, 292, 309, 325, 338, 344, 531, , 535
ESP10, 292, 310, 323, 337, 342, 533, , 537
ESP10, 290, 308, 320, 334, 339, 535, , 539
ESP10, 292, 309, 322, 335, 342, 537, , 541
ESP10, 290, 306, 321, 333, 340, 539, , 543
ESP10, 293, 306, 324, 333, 342, 541, , 545
ESP10, 295, 304, 324, 333, 340, 543, , 547
ESP10, 296, 306, 326, 335, 341, 545, , 549
ESP10, 297, 310, 328, 336, 344, 547, , 551
ESP10, 302, 314, 331, 341, 349, 550, , 554
ESP10, 298, 310, 327, 336, 345, 552, , 556
ESP10, 295, 308, 324, 332, 341, 554, , 558
ESP10, 299, 312, 326, 331, 341, 556, , 560
ESP10, 296, 311, 322, 329, 337, 558, , 562
ESP10, 297, 312, 322, 330, 338, 560, , 564
ESP10, 292, 307, 321, 325, 334, 562, , 566
ESP10, 292, 305, 318, 325, 332, 564, , 568
ESP10, 295, 308, 318, 327, 333, 566, , 570
ESP10, 298, 310, 321, 328, 336, 568, , 572
ESP10, 292, 303, 314, 322, 329, 571, , 575
ESP10, 296, 305, 317, 325, 331, 573, , 577
ESP10, 296, 304, 316, 324, 332, 575, , 579
ESP10, 298, 305, 316, 325, 333, 577, , 581
ESP10, 301, 308, 318, 330, 336, 579, , 583
ESP10, 301, 307, 316, 328, 335, 581, , 585
ESP10, 301, 309, 317, 328, 335, 583, , 587
ESP10, 307, 316, 320, 333, 339, 585, , 589
ESP10, 310, 319, 324, 335, 343, 587, , 591
ESP10, 311, 320, 325, 337, 343, 589, , 593
ESP10, 308, 319, 327, 335, 341, 591, , 595
ESP10, 316, 327, 335, 343, 348, 594, , 598
ESP10, 316, 327, 336, 344, 347, 596, , 600
ESP10, 323, 333, 341, 350, 353, 598, , 602
ESP10, 324, 330, 340, 348, 351, 600, , 604
ESP10, 324, 331, 339, 348, 350, 602, , 606
ESP10, 327, 333, 342, 349, 352, 604, , 608
ESP10, 328, 335, 343, 350, 353, 606, , 610
ESP10, 326, 333, 342, 348, 352, 608, , 612
ESP10, 326, 333, 342, 347, 351, 610, , 614
ESP10, 328, 336, 345, 350, 354, 612, , 616
ESP10, 329, 339, 347, 353, 355, 614, , 618
ESP10, 327, 338, 346, 351, 354, 617, , 621
ESP10, 328, 340, 346, 352, 355, 619, , 623
ESP10, 324, 336, 342, 348, 354, 621, , 625
ESP10, 335, 344, 351, 356, 362, 623, , 627
ESP10, 334, 343, 350, 356, 360, 625, , 629
ESP10, 335, 344, 350, 355, 361, 627, , 631
ESP10, 331, 339, 345, 351, 356, 629, , 633
ESP10, 331, 340, 347, 350, 356, 631, , 635
ESP10, 329, 339, 346, 348, 354, 633, , 637
ESP10, 333, 342, 349, 352, 357, 635, , 639
ESP10, 337, 344, 352, 354, 359, 638, , 642
ESP10, 336, 342, 349, 353, 356, 640, , 644
ESP10, 338, 342, 349, 354, 356, 642, , 646
ESP10, 337, 341, 349, 353, 356, 644, , 648
ESP10, 339, 344, 352, 356, 358, 646, , 650
ESP10, 346, 350, 356, 359, 361, 648, , 652
ESP10, 347, 349, 355, 358, 360, 650, , 654
ESP10, 347, 350, 355, 358, 360, 652, , 656
ESP10, 346, 350, 355, 358, 360, 654, , 658
ESP10, 347, 351, 356, 359, 360, 656, , 660
ESP10, 347, 352, 356, 359, 360, 658, , 662
ESP10, 347, 352, 355, 359, 360, 661, , 665
ESP10, 346, 351, 355, 358, 359, 663, , 667
ESP10, 345, 350, 354, 357, 358, 665, , 669
ESP10, 346, 352, 355, 358, 360, 667, , 671
ESP10, 346, 352, 356, 358, 360, 669, , 673
ESP10, 346, 352, 355, 357, 359, 671, , 675
ESP10, 347, 352, 355, 357, 359, 673, , 677
ESP10, 347, 353, 356, 358, 360, 675, , 679
ESP10, 347, 353, 356, 358, 360, 677, , 681
ESP10, 347, 352, 355, 357, 359, 679, , 683
ESP10, 347, 352, 355, 357, 359, 681, , 685
ESP10, 347, 352, 355, 357, 359, 684, , 688
ESP10, 347, 352, 355, 357, 359, 686, , 690
ESP10, 348, 352, 356, 357, 359, 688, , 692
ESP10, 349, 352, 356, 358, 359, 690, , 694
ESP10, 350, 353, 357, 358, 360, 692, , 696
ESP10, 350, 354, 356, 358, 359, 694, , 698
ESP10, 351, 355, 358, 360, 361, 696, , 700
ESP10, 351, 355, 358, 359, 361, 698, , 702
ESP10, 351, 355, 357, 359, 360, 700, , 704
ESP10, 352, 356, 358, 359, 360, 702, , 706
ESP10, 351, 355, 358, 359, 360, 705, , 709
ESP10, 352, 356, 358, 359, 360, 707, , 711
ESP10, 354, 357, 359, 360, 361, 709, , 713
ESP10, 354, 356, 359, 359, 360, 711, , 715
ESP10, 354, 356, 359, 360, 361, 713, , 717
ESP10, 354, 356, 359, 359, 360, 715, , 719
ESP10, 355, 358, 359, 360, 361, 717, , 721
ESP10, 353, 356, 358, 359, 360, 719, , 723
ESP10, 353, 356, 358, 359, 361, 721, , 725
ESP10, 353, 356, 358, 359, 360, 723, , 727
ESP10, 353, 356, 358, 359, 360, 725, , 729
ESP10, 354, 357, 359, 360, 361, 728, , 732
ESP10, 357, 359, 361, 362, 363, 730, , 734
ESP10, 355, 358, 360, 361, 362, 732, , 736
ESP10, 356, 358, 360, 361, 362, 734, , 738
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/PRDW1W_SQIN.ESPF10.csv
PRDW1W_SQIN.ESPF0.csv|2026-08-15
PRDW1W_SQIN.ESPF10.csv|2026-08-15
PRDW1W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
COLUMBIA - BLO PRIEST RAPIDS DAM
(
PRDW1
)
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
49829
63713
93
82989
68162
APR-JUL
42117
53162
90
69620
58905
APR-AUG
47148
60003
93
78483
64656
JAN-SEP
56316
71131
90
91944
78616
JAN-JUL
48708
61455
89
78809
69359
OCT-SEP
63477
79755
90
101037
88197
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/PRDW1W_SQIN.ESPF10.csv
PRDW1W_SQIN.ESPF0.csv|2026-08-15
PRDW1W_SQIN.ESPF10.csv|2026-08-15
PRDW1W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
