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Water Year
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COLUMBIA - MCNARY DAM
(
MCDW1
)
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
75221
75520
81
76206
92790
APR-JUL
66401
66401
82
66401
80726
APR-AUG
71506
71595
81
71686
88088
JAN-SEP
98461
98760
88
99447
112028
JAN-JUL
89642
89642
90
89642
99964
OCT-SEP
116603
116901
92
117588
126785
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
75333
75578
81
76105
92790
APR-JUL
66401
66401
82
66401
80726
APR-AUG
71574
71669
81
71799
88088
JAN-SEP
98574
98818
88
99346
112028
JAN-JUL
89642
89642
90
89642
99964
OCT-SEP
116715
116960
92
117487
126785
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
75363
75667
82
76446
92790
APR-JUL
66401
66401
82
66401
80726
APR-AUG
71501
71619
81
71828
88088
JAN-SEP
98604
98908
88
99686
112028
JAN-JUL
89642
89642
90
89642
99964
OCT-SEP
116745
117049
92
117828
126785
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 257, 322, 360, 416, 450, 70, , 74
ESP10, 252, 317, 355, 412, 448, 72, , 76
ESP10, 249, 319, 352, 413, 447, 74, , 78
ESP10, 248, 315, 353, 413, 446, 76, , 80
ESP10, 247, 316, 353, 412, 445, 78, , 82
ESP10, 243, 310, 350, 412, 442, 81, , 85
ESP10, 245, 313, 353, 416, 444, 83, , 87
ESP10, 247, 316, 356, 419, 446, 85, , 89
ESP10, 244, 318, 358, 422, 446, 87, , 91
ESP10, 240, 315, 352, 417, 443, 89, , 93
ESP10, 238, 318, 355, 411, 442, 91, , 95
ESP10, 239, 321, 359, 413, 444, 93, , 97
ESP10, 234, 319, 353, 413, 443, 95, , 99
ESP10, 235, 319, 355, 414, 446, 97, , 101
ESP10, 232, 317, 349, 411, 443, 99, , 103
ESP10, 217, 304, 336, 403, 431, 102, , 106
ESP10, 208, 296, 327, 395, 423, 104, , 108
ESP10, 218, 306, 338, 404, 431, 106, , 110
ESP10, 222, 308, 341, 406, 433, 108, , 112
ESP10, 223, 310, 346, 408, 434, 110, , 114
ESP10, 212, 302, 337, 396, 425, 112, , 116
ESP10, 212, 307, 341, 402, 426, 114, , 118
ESP10, 205, 308, 336, 399, 424, 116, , 120
ESP10, 214, 323, 344, 407, 434, 118, , 122
ESP10, 217, 327, 351, 419, 437, 120, , 124
ESP10, 217, 328, 354, 425, 439, 122, , 126
ESP10, 218, 329, 354, 426, 437, 125, , 129
ESP10, 230, 333, 359, 428, 438, 127, , 131
ESP10, 225, 326, 353, 421, 434, 129, , 133
ESP10, 207, 312, 341, 408, 424, 131, , 135
ESP10, 206, 311, 340, 407, 423, 133, , 137
ESP10, 213, 314, 345, 411, 428, 135, , 139
ESP10, 223, 317, 345, 408, 431, 137, , 141
ESP10, 231, 325, 355, 414, 440, 139, , 143
ESP10, 237, 326, 358, 416, 441, 141, , 145
ESP10, 237, 327, 359, 416, 441, 143, , 147
ESP10, 238, 327, 360, 414, 442, 145, , 149
ESP10, 233, 319, 351, 407, 434, 148, , 152
ESP10, 240, 325, 357, 412, 440, 150, , 154
ESP10, 243, 324, 359, 410, 444, 152, , 156
ESP10, 248, 330, 362, 410, 449, 154, , 158
ESP10, 252, 338, 365, 412, 451, 156, , 160
ESP10, 263, 344, 373, 416, 457, 158, , 162
ESP10, 272, 345, 378, 425, 464, 160, , 164
ESP10, 269, 337, 373, 422, 460, 162, , 166
ESP10, 276, 342, 378, 425, 465, 164, , 168
ESP10, 271, 334, 373, 422, 464, 166, , 170
ESP10, 283, 341, 379, 427, 470, 169, , 173
ESP10, 287, 339, 375, 423, 471, 171, , 175
ESP10, 289, 342, 376, 425, 473, 173, , 177
ESP10, 287, 343, 375, 423, 471, 175, , 179
ESP10, 282, 344, 372, 418, 470, 177, , 181
ESP10, 281, 346, 372, 416, 467, 179, , 183
ESP10, 291, 355, 383, 427, 474, 181, , 185
ESP10, 288, 352, 381, 428, 470, 183, , 187
ESP10, 288, 351, 382, 429, 469, 185, , 189
ESP10, 281, 344, 378, 426, 465, 187, , 191
ESP10, 279, 342, 379, 429, 464, 189, , 193
ESP10, 282, 343, 382, 431, 465, 192, , 196
ESP10, 270, 328, 373, 418, 453, 194, , 198
ESP10, 257, 313, 363, 407, 441, 196, , 200
ESP10, 263, 321, 370, 412, 447, 198, , 202
ESP10, 251, 317, 361, 401, 438, 200, , 204
ESP10, 232, 296, 339, 382, 423, 202, , 206
ESP10, 234, 300, 341, 388, 428, 204, , 208
ESP10, 225, 296, 336, 384, 421, 206, , 210
ESP10, 232, 301, 345, 396, 430, 208, , 212
ESP10, 227, 295, 339, 390, 424, 210, , 214
ESP10, 212, 274, 320, 372, 413, 212, , 216
ESP10, 205, 267, 315, 365, 406, 215, , 219
ESP10, 203, 264, 313, 365, 404, 217, , 221
ESP10, 208, 262, 315, 370, 410, 219, , 223
ESP10, 207, 263, 316, 369, 409, 221, , 225
ESP10, 204, 258, 311, 364, 408, 223, , 227
ESP10, 207, 257, 314, 363, 409, 225, , 229
ESP10, 209, 255, 313, 362, 408, 227, , 231
ESP10, 206, 257, 315, 357, 408, 229, , 233
ESP10, 214, 260, 318, 357, 409, 231, , 235
ESP10, 216, 269, 320, 356, 411, 233, , 237
ESP10, 220, 272, 314, 353, 406, 236, , 240
ESP10, 231, 275, 319, 359, 409, 238, , 242
ESP10, 240, 278, 323, 362, 408, 240, , 244
ESP10, 253, 280, 332, 372, 415, 242, , 246
ESP10, 256, 280, 335, 377, 417, 244, , 248
ESP10, 249, 270, 326, 374, 411, 246, , 250
ESP10, 244, 266, 322, 373, 412, 248, , 252
ESP10, 245, 274, 324, 377, 415, 250, , 254
ESP10, 246, 281, 333, 383, 422, 252, , 256
ESP10, 245, 282, 332, 378, 418, 254, , 258
ESP10, 251, 285, 329, 378, 417, 256, , 260
ESP10, 259, 287, 337, 374, 418, 259, , 263
ESP10, 257, 290, 334, 373, 417, 261, , 265
ESP10, 253, 286, 328, 369, 412, 263, , 267
ESP10, 251, 296, 330, 375, 413, 265, , 269
ESP10, 243, 290, 326, 371, 406, 267, , 271
ESP10, 241, 291, 326, 373, 405, 269, , 273
ESP10, 238, 290, 325, 374, 406, 271, , 275
ESP10, 237, 292, 326, 374, 405, 273, , 277
ESP10, 242, 289, 327, 373, 404, 275, , 279
ESP10, 247, 289, 330, 371, 403, 277, , 281
ESP10, 246, 290, 331, 371, 405, 279, , 283
ESP10, 246, 291, 330, 371, 406, 282, , 286
ESP10, 244, 292, 328, 368, 405, 284, , 288
ESP10, 248, 295, 325, 366, 406, 286, , 290
ESP10, 254, 294, 331, 367, 414, 288, , 292
ESP10, 251, 297, 333, 366, 412, 290, , 294
ESP10, 248, 293, 334, 364, 409, 292, , 296
ESP10, 253, 298, 337, 366, 410, 294, , 298
ESP10, 255, 303, 337, 367, 409, 296, , 300
ESP10, 260, 316, 343, 374, 414, 298, , 302
ESP10, 264, 318, 345, 375, 414, 300, , 304
ESP10, 273, 319, 349, 379, 420, 303, , 307
ESP10, 279, 322, 350, 382, 420, 305, , 309
ESP10, 285, 327, 356, 387, 425, 307, , 311
ESP10, 286, 328, 358, 386, 426, 309, , 313
ESP10, 281, 330, 354, 384, 421, 311, , 315
ESP10, 286, 331, 356, 385, 423, 313, , 317
ESP10, 290, 332, 359, 385, 428, 315, , 319
ESP10, 292, 341, 360, 387, 429, 317, , 321
ESP10, 292, 345, 362, 387, 429, 319, , 323
ESP10, 294, 341, 359, 386, 425, 321, , 325
ESP10, 292, 339, 355, 382, 421, 323, , 327
ESP10, 284, 334, 350, 377, 416, 326, , 330
ESP10, 289, 334, 350, 378, 419, 328, , 332
ESP10, 297, 336, 351, 378, 421, 330, , 334
ESP10, 298, 338, 353, 380, 420, 332, , 336
ESP10, 294, 334, 349, 376, 416, 334, , 338
ESP10, 301, 340, 355, 382, 420, 336, , 340
ESP10, 301, 337, 352, 382, 418, 338, , 342
ESP10, 301, 337, 353, 382, 417, 340, , 344
ESP10, 303, 338, 355, 381, 414, 342, , 346
ESP10, 306, 340, 354, 382, 414, 344, , 348
ESP10, 304, 336, 349, 377, 409, 346, , 350
ESP10, 311, 341, 353, 381, 410, 349, , 353
ESP10, 308, 343, 353, 382, 407, 351, , 355
ESP10, 300, 332, 343, 374, 398, 353, , 357
ESP10, 298, 331, 342, 373, 398, 355, , 359
ESP10, 303, 337, 348, 378, 403, 357, , 361
ESP10, 291, 323, 337, 365, 393, 359, , 363
ESP10, 303, 335, 349, 377, 406, 361, , 365
ESP10, 296, 328, 343, 368, 401, 363, , 367
ESP10, 303, 333, 352, 374, 407, 365, , 369
ESP10, 304, 333, 351, 377, 406, 367, , 371
ESP10, 310, 337, 355, 382, 410, 370, , 374
ESP10, 314, 336, 356, 384, 410, 372, , 376
ESP10, 318, 342, 357, 388, 412, 374, , 378
ESP10, 321, 342, 360, 388, 411, 376, , 380
ESP10, 315, 337, 356, 381, 403, 378, , 382
ESP10, 310, 330, 352, 375, 399, 380, , 384
ESP10, 301, 324, 345, 366, 390, 382, , 386
ESP10, 304, 331, 352, 368, 392, 384, , 388
ESP10, 300, 328, 350, 366, 389, 386, , 390
ESP10, 292, 319, 346, 360, 380, 388, , 392
ESP10, 283, 314, 341, 355, 373, 390, , 394
ESP10, 281, 312, 340, 354, 367, 393, , 397
ESP10, 278, 310, 337, 353, 368, 395, , 399
ESP10, 271, 302, 329, 344, 359, 397, , 401
ESP10, 273, 304, 329, 344, 360, 399, , 403
ESP10, 266, 295, 317, 333, 349, 401, , 405
ESP10, 280, 308, 330, 344, 363, 403, , 407
ESP10, 279, 307, 326, 342, 360, 405, , 409
ESP10, 271, 302, 319, 337, 354, 407, , 411
ESP10, 276, 305, 320, 340, 355, 409, , 413
ESP10, 281, 310, 325, 346, 362, 411, , 415
ESP10, 279, 308, 326, 345, 359, 413, , 417
ESP10, 276, 306, 322, 342, 356, 416, , 420
ESP10, 271, 301, 318, 337, 351, 418, , 422
ESP10, 273, 303, 321, 344, 354, 420, , 424
ESP10, 276, 304, 321, 343, 357, 422, , 426
ESP10, 280, 306, 327, 345, 359, 424, , 428
ESP10, 283, 305, 326, 343, 358, 426, , 430
ESP10, 291, 308, 328, 345, 363, 428, , 432
ESP10, 296, 308, 328, 343, 363, 430, , 434
ESP10, 283, 298, 319, 333, 353, 432, , 436
ESP10, 278, 294, 315, 327, 347, 434, , 438
ESP10, 282, 300, 318, 334, 351, 437, , 441
ESP10, 278, 296, 315, 334, 349, 439, , 443
ESP10, 279, 298, 321, 339, 349, 441, , 445
ESP10, 281, 304, 327, 343, 356, 443, , 447
ESP10, 283, 306, 327, 346, 360, 445, , 449
ESP10, 290, 313, 337, 353, 365, 447, , 451
ESP10, 294, 313, 339, 354, 367, 449, , 453
ESP10, 291, 312, 337, 349, 365, 451, , 455
ESP10, 296, 321, 342, 355, 370, 453, , 457
ESP10, 295, 321, 342, 357, 369, 455, , 459
ESP10, 292, 318, 342, 358, 368, 457, , 461
ESP10, 295, 318, 342, 359, 367, 460, , 464
ESP10, 297, 325, 347, 363, 370, 462, , 466
ESP10, 296, 320, 344, 359, 365, 464, , 468
ESP10, 291, 314, 338, 352, 359, 466, , 470
ESP10, 288, 314, 334, 348, 355, 468, , 472
ESP10, 289, 314, 335, 348, 355, 470, , 474
ESP10, 288, 314, 335, 349, 356, 472, , 476
ESP10, 292, 317, 338, 352, 359, 474, , 478
ESP10, 290, 317, 335, 348, 354, 476, , 480
ESP10, 303, 326, 343, 356, 362, 478, , 482
ESP10, 299, 321, 341, 354, 360, 480, , 484
ESP10, 307, 328, 344, 357, 364, 483, , 487
ESP10, 310, 325, 344, 354, 362, 485, , 489
ESP10, 310, 325, 344, 354, 362, 487, , 491
ESP10, 313, 328, 344, 358, 364, 489, , 493
ESP10, 315, 329, 348, 360, 366, 491, , 495
ESP10, 316, 334, 351, 361, 368, 493, , 497
ESP10, 324, 344, 360, 370, 380, 495, , 499
ESP10, 323, 343, 358, 369, 379, 497, , 501
ESP10, 324, 345, 359, 370, 380, 499, , 503
ESP10, 323, 345, 358, 367, 379, 501, , 505
ESP10, 321, 346, 357, 366, 379, 504, , 508
ESP10, 323, 348, 359, 368, 380, 506, , 510
ESP10, 324, 347, 359, 367, 380, 508, , 512
ESP10, 325, 348, 360, 370, 380, 510, , 514
ESP10, 332, 352, 365, 374, 384, 512, , 516
ESP10, 334, 357, 367, 376, 389, 514, , 518
ESP10, 335, 357, 369, 378, 389, 516, , 520
ESP10, 335, 357, 369, 379, 387, 518, , 522
ESP10, 335, 356, 369, 378, 386, 520, , 524
ESP10, 336, 357, 369, 379, 385, 522, , 526
ESP10, 336, 355, 369, 380, 384, 524, , 528
ESP10, 336, 354, 368, 380, 386, 527, , 531
ESP10, 337, 357, 366, 380, 386, 529, , 533
ESP10, 340, 360, 367, 381, 386, 531, , 535
ESP10, 340, 358, 366, 380, 384, 533, , 537
ESP10, 342, 358, 366, 379, 383, 535, , 539
ESP10, 344, 358, 369, 380, 386, 537, , 541
ESP10, 342, 355, 368, 378, 384, 539, , 543
ESP10, 345, 355, 369, 379, 386, 541, , 545
ESP10, 346, 353, 368, 378, 385, 543, , 547
ESP10, 348, 355, 372, 379, 385, 545, , 549
ESP10, 351, 358, 374, 381, 386, 547, , 551
ESP10, 354, 364, 377, 385, 390, 550, , 554
ESP10, 350, 360, 373, 381, 386, 552, , 556
ESP10, 349, 359, 371, 379, 384, 554, , 558
ESP10, 351, 364, 371, 378, 384, 556, , 560
ESP10, 349, 362, 371, 375, 381, 558, , 562
ESP10, 349, 362, 371, 376, 381, 560, , 564
ESP10, 347, 359, 369, 373, 380, 562, , 566
ESP10, 348, 357, 367, 372, 379, 564, , 568
ESP10, 348, 360, 368, 373, 379, 566, , 570
ESP10, 352, 362, 369, 375, 381, 568, , 572
ESP10, 348, 357, 365, 371, 377, 571, , 575
ESP10, 352, 359, 368, 373, 379, 573, , 577
ESP10, 352, 358, 367, 374, 379, 575, , 579
ESP10, 353, 360, 369, 374, 380, 577, , 581
ESP10, 356, 362, 370, 377, 382, 579, , 583
ESP10, 357, 362, 369, 377, 382, 581, , 585
ESP10, 356, 362, 370, 377, 381, 583, , 587
ESP10, 360, 367, 372, 381, 385, 585, , 589
ESP10, 363, 370, 374, 382, 386, 587, , 591
ESP10, 365, 371, 376, 384, 388, 589, , 593
ESP10, 363, 370, 375, 382, 386, 591, , 595
ESP10, 369, 377, 382, 388, 392, 594, , 598
ESP10, 368, 377, 383, 389, 391, 596, , 600
ESP10, 373, 381, 387, 392, 395, 598, , 602
ESP10, 374, 379, 386, 391, 393, 600, , 604
ESP10, 374, 379, 386, 391, 393, 602, , 606
ESP10, 376, 381, 387, 392, 395, 604, , 608
ESP10, 377, 382, 387, 393, 395, 606, , 610
ESP10, 376, 382, 387, 391, 395, 608, , 612
ESP10, 375, 382, 387, 391, 394, 610, , 614
ESP10, 377, 383, 389, 393, 396, 612, , 616
ESP10, 378, 385, 390, 395, 396, 614, , 618
ESP10, 376, 384, 389, 394, 396, 617, , 621
ESP10, 377, 386, 390, 394, 397, 619, , 623
ESP10, 374, 383, 387, 392, 396, 621, , 625
ESP10, 382, 388, 393, 397, 401, 623, , 627
ESP10, 382, 388, 392, 397, 400, 625, , 629
ESP10, 383, 388, 393, 397, 401, 627, , 631
ESP10, 379, 385, 390, 393, 397, 629, , 633
ESP10, 379, 385, 390, 392, 396, 631, , 635
ESP10, 376, 383, 388, 389, 394, 633, , 637
ESP10, 378, 385, 390, 393, 396, 635, , 639
ESP10, 381, 387, 392, 394, 398, 638, , 642
ESP10, 380, 385, 391, 393, 396, 640, , 644
ESP10, 382, 385, 391, 394, 396, 642, , 646
ESP10, 382, 385, 391, 394, 395, 644, , 648
ESP10, 384, 387, 392, 395, 397, 646, , 650
ESP10, 388, 391, 395, 398, 399, 648, , 652
ESP10, 389, 391, 395, 398, 399, 650, , 654
ESP10, 389, 391, 395, 398, 399, 652, , 656
ESP10, 388, 391, 395, 398, 399, 654, , 658
ESP10, 389, 393, 396, 399, 399, 656, , 660
ESP10, 389, 394, 396, 399, 399, 658, , 662
ESP10, 389, 393, 395, 398, 399, 661, , 665
ESP10, 388, 393, 395, 397, 398, 663, , 667
ESP10, 388, 392, 394, 397, 398, 665, , 669
ESP10, 389, 394, 396, 398, 399, 667, , 671
ESP10, 389, 394, 396, 398, 399, 669, , 673
ESP10, 389, 394, 396, 398, 399, 671, , 675
ESP10, 389, 394, 396, 398, 399, 673, , 677
ESP10, 389, 395, 396, 398, 399, 675, , 679
ESP10, 389, 394, 396, 398, 399, 677, , 681
ESP10, 389, 394, 396, 398, 399, 679, , 683
ESP10, 389, 394, 396, 398, 399, 681, , 685
ESP10, 389, 394, 396, 398, 399, 684, , 688
ESP10, 390, 394, 396, 398, 399, 686, , 690
ESP10, 390, 394, 397, 398, 399, 688, , 692
ESP10, 391, 395, 397, 398, 400, 690, , 694
ESP10, 392, 395, 397, 399, 400, 692, , 696
ESP10, 392, 396, 397, 399, 400, 694, , 698
ESP10, 393, 397, 398, 400, 401, 696, , 700
ESP10, 393, 397, 398, 400, 401, 698, , 702
ESP10, 393, 397, 398, 400, 401, 700, , 704
ESP10, 394, 397, 399, 400, 401, 702, , 706
ESP10, 394, 397, 399, 400, 401, 705, , 709
ESP10, 395, 397, 399, 400, 401, 707, , 711
ESP10, 396, 398, 400, 401, 401, 709, , 713
ESP10, 395, 398, 399, 400, 401, 711, , 715
ESP10, 396, 398, 400, 400, 401, 713, , 717
ESP10, 396, 398, 399, 400, 401, 715, , 719
ESP10, 396, 399, 400, 400, 401, 717, , 721
ESP10, 395, 398, 399, 400, 401, 719, , 723
ESP10, 395, 398, 399, 400, 401, 721, , 725
ESP10, 395, 398, 400, 400, 401, 723, , 727
ESP10, 396, 398, 400, 400, 401, 725, , 729
ESP10, 397, 399, 400, 401, 402, 728, , 732
ESP10, 398, 400, 401, 402, 403, 730, , 734
ESP10, 398, 400, 401, 402, 403, 732, , 736
ESP10, 398, 400, 401, 402, 403, 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/MCDW1W_SQIN.ESPF10.csv
MCDW1W_SQIN.ESPF0.csv|2026-08-15
MCDW1W_SQIN.ESPF10.csv|2026-08-15
MCDW1W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
COLUMBIA - MCNARY DAM
(
MCDW1
)
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
64154
85574
92
108312
92790
APR-JUL
54764
72799
90
92652
80726
APR-AUG
60390
80282
91
102394
88088
JAN-SEP
77627
101068
90
127224
112028
JAN-JUL
68063
88636
89
112816
99964
OCT-SEP
88971
113371
89
144140
126785
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/MCDW1W_SQIN.ESPF10.csv
MCDW1W_SQIN.ESPF0.csv|2026-08-15
MCDW1W_SQIN.ESPF10.csv|2026-08-15
MCDW1W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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