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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:
2026-07-05
Issued:
2026-07-05
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
75901
76754
83
78282
92790
APR-JUL
65931
66259
82
66657
80726
JAN-SEP
99141
99995
89
101522
112028
JAN-JUL
89171
89500
90
89897
99964
OCT-SEP
117282
118136
93
119664
126785
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-07-05
Issued:
2026-07-05
Hide Forecast
APR-SEP
76070
76894
83
78378
92790
APR-JUL
65958
66356
82
66666
80726
JAN-SEP
99311
100135
89
101619
112028
JAN-JUL
89198
89596
90
89907
99964
OCT-SEP
117452
118276
93
119760
126785
Reference
ESP with 0 Days QPF
Ensemble:
2026-07-05
Issued:
2026-07-05
Hide Forecast
APR-SEP
76393
77835
84
79879
92790
APR-JUL
66223
67036
83
67772
80726
JAN-SEP
99634
101076
90
103120
112028
JAN-JUL
89463
90277
90
91012
99964
OCT-SEP
117775
119217
94
121261
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, 73, , 77
ESP10, 249, 319, 352, 413, 447, 75, , 79
ESP10, 248, 315, 353, 413, 446, 78, , 82
ESP10, 247, 316, 353, 412, 445, 80, , 84
ESP10, 243, 310, 350, 412, 442, 82, , 86
ESP10, 245, 313, 353, 416, 444, 85, , 89
ESP10, 247, 316, 356, 419, 446, 87, , 91
ESP10, 244, 318, 358, 422, 446, 90, , 94
ESP10, 240, 315, 352, 417, 443, 92, , 96
ESP10, 238, 318, 355, 411, 442, 94, , 98
ESP10, 239, 321, 359, 413, 444, 97, , 101
ESP10, 234, 319, 353, 413, 443, 99, , 103
ESP10, 235, 319, 355, 414, 446, 102, , 106
ESP10, 232, 317, 349, 411, 443, 104, , 108
ESP10, 217, 304, 336, 403, 431, 106, , 110
ESP10, 208, 296, 327, 395, 423, 109, , 113
ESP10, 218, 306, 338, 404, 431, 111, , 115
ESP10, 222, 308, 341, 406, 433, 114, , 118
ESP10, 223, 310, 346, 408, 434, 116, , 120
ESP10, 212, 302, 337, 396, 425, 118, , 122
ESP10, 212, 307, 341, 402, 426, 121, , 125
ESP10, 205, 308, 336, 399, 424, 123, , 127
ESP10, 214, 323, 344, 407, 434, 126, , 130
ESP10, 217, 327, 351, 419, 437, 128, , 132
ESP10, 217, 328, 354, 425, 439, 130, , 134
ESP10, 218, 329, 354, 426, 437, 133, , 137
ESP10, 230, 333, 359, 428, 438, 135, , 139
ESP10, 225, 326, 353, 421, 434, 138, , 142
ESP10, 207, 312, 341, 408, 424, 140, , 144
ESP10, 206, 311, 340, 407, 423, 142, , 146
ESP10, 213, 314, 345, 411, 428, 145, , 149
ESP10, 223, 317, 345, 408, 431, 147, , 151
ESP10, 231, 325, 355, 414, 440, 150, , 154
ESP10, 237, 326, 358, 416, 441, 152, , 156
ESP10, 237, 327, 359, 416, 441, 154, , 158
ESP10, 238, 327, 360, 414, 442, 157, , 161
ESP10, 233, 319, 351, 407, 434, 159, , 163
ESP10, 240, 325, 357, 412, 440, 162, , 166
ESP10, 243, 324, 359, 410, 444, 164, , 168
ESP10, 248, 330, 362, 410, 449, 166, , 170
ESP10, 252, 338, 365, 412, 451, 169, , 173
ESP10, 263, 344, 373, 416, 457, 171, , 175
ESP10, 272, 345, 378, 425, 464, 174, , 178
ESP10, 269, 337, 373, 422, 460, 176, , 180
ESP10, 276, 342, 378, 425, 465, 178, , 182
ESP10, 271, 334, 373, 422, 464, 181, , 185
ESP10, 283, 341, 379, 427, 470, 183, , 187
ESP10, 287, 339, 375, 423, 471, 186, , 190
ESP10, 289, 342, 376, 425, 473, 188, , 192
ESP10, 287, 343, 375, 423, 471, 190, , 194
ESP10, 282, 344, 372, 418, 470, 193, , 197
ESP10, 281, 346, 372, 416, 467, 195, , 199
ESP10, 291, 355, 383, 427, 474, 198, , 202
ESP10, 288, 352, 381, 428, 470, 200, , 204
ESP10, 288, 351, 382, 429, 469, 202, , 206
ESP10, 281, 344, 378, 426, 465, 205, , 209
ESP10, 279, 342, 379, 429, 464, 207, , 211
ESP10, 282, 343, 382, 431, 465, 210, , 214
ESP10, 270, 328, 373, 418, 453, 212, , 216
ESP10, 257, 313, 363, 407, 441, 214, , 218
ESP10, 263, 321, 370, 412, 447, 217, , 221
ESP10, 251, 317, 361, 401, 438, 219, , 223
ESP10, 232, 296, 339, 382, 423, 222, , 226
ESP10, 234, 300, 341, 388, 428, 224, , 228
ESP10, 225, 296, 336, 384, 421, 226, , 230
ESP10, 232, 301, 345, 396, 430, 229, , 233
ESP10, 227, 295, 339, 390, 424, 231, , 235
ESP10, 212, 274, 320, 372, 413, 234, , 238
ESP10, 205, 267, 315, 365, 406, 236, , 240
ESP10, 203, 264, 313, 365, 404, 239, , 243
ESP10, 208, 262, 315, 370, 410, 241, , 245
ESP10, 207, 263, 316, 369, 409, 243, , 247
ESP10, 204, 258, 311, 364, 408, 246, , 250
ESP10, 207, 257, 314, 363, 409, 248, , 252
ESP10, 209, 255, 313, 362, 408, 251, , 255
ESP10, 206, 257, 315, 357, 408, 253, , 257
ESP10, 214, 260, 318, 357, 409, 255, , 259
ESP10, 216, 269, 320, 356, 411, 258, , 262
ESP10, 220, 272, 314, 353, 406, 260, , 264
ESP10, 231, 275, 319, 359, 409, 263, , 267
ESP10, 240, 278, 323, 362, 408, 265, , 269
ESP10, 253, 280, 332, 372, 415, 267, , 271
ESP10, 256, 280, 335, 377, 417, 270, , 274
ESP10, 249, 270, 326, 374, 411, 272, , 276
ESP10, 244, 266, 322, 373, 412, 275, , 279
ESP10, 245, 274, 324, 377, 415, 277, , 281
ESP10, 246, 281, 333, 383, 422, 279, , 283
ESP10, 245, 282, 332, 378, 418, 282, , 286
ESP10, 251, 285, 329, 378, 417, 284, , 288
ESP10, 259, 287, 337, 374, 418, 287, , 291
ESP10, 257, 290, 334, 373, 417, 289, , 293
ESP10, 253, 286, 328, 369, 412, 291, , 295
ESP10, 251, 296, 330, 375, 413, 294, , 298
ESP10, 243, 290, 326, 371, 406, 296, , 300
ESP10, 241, 291, 326, 373, 405, 299, , 303
ESP10, 238, 290, 325, 374, 406, 301, , 305
ESP10, 237, 292, 326, 374, 405, 303, , 307
ESP10, 242, 289, 327, 373, 404, 306, , 310
ESP10, 247, 289, 330, 371, 403, 308, , 312
ESP10, 246, 290, 331, 371, 405, 311, , 315
ESP10, 246, 291, 330, 371, 406, 313, , 317
ESP10, 244, 292, 328, 368, 405, 315, , 319
ESP10, 248, 295, 325, 366, 406, 318, , 322
ESP10, 254, 294, 331, 367, 414, 320, , 324
ESP10, 251, 297, 333, 366, 412, 323, , 327
ESP10, 248, 293, 334, 364, 409, 325, , 329
ESP10, 253, 298, 337, 366, 410, 327, , 331
ESP10, 255, 303, 337, 367, 409, 330, , 334
ESP10, 260, 316, 343, 374, 414, 332, , 336
ESP10, 264, 318, 345, 375, 414, 335, , 339
ESP10, 273, 319, 349, 379, 420, 337, , 341
ESP10, 279, 322, 350, 382, 420, 339, , 343
ESP10, 285, 327, 356, 387, 425, 342, , 346
ESP10, 286, 328, 358, 386, 426, 344, , 348
ESP10, 281, 330, 354, 384, 421, 347, , 351
ESP10, 286, 331, 356, 385, 423, 349, , 353
ESP10, 290, 332, 359, 385, 428, 351, , 355
ESP10, 292, 341, 360, 387, 429, 354, , 358
ESP10, 292, 345, 362, 387, 429, 356, , 360
ESP10, 294, 341, 359, 386, 425, 359, , 363
ESP10, 292, 339, 355, 382, 421, 361, , 365
ESP10, 284, 334, 350, 377, 416, 363, , 367
ESP10, 289, 334, 350, 378, 419, 366, , 370
ESP10, 297, 336, 351, 378, 421, 368, , 372
ESP10, 298, 338, 353, 380, 420, 371, , 375
ESP10, 294, 334, 349, 376, 416, 373, , 377
ESP10, 301, 340, 355, 382, 420, 375, , 379
ESP10, 301, 337, 352, 382, 418, 378, , 382
ESP10, 301, 337, 353, 382, 417, 380, , 384
ESP10, 303, 338, 355, 381, 414, 383, , 387
ESP10, 306, 340, 354, 382, 414, 385, , 389
ESP10, 304, 336, 349, 377, 409, 387, , 391
ESP10, 311, 341, 353, 381, 410, 390, , 394
ESP10, 308, 343, 353, 382, 407, 392, , 396
ESP10, 300, 332, 343, 374, 398, 395, , 399
ESP10, 298, 331, 342, 373, 398, 397, , 401
ESP10, 303, 337, 348, 378, 403, 399, , 403
ESP10, 291, 323, 337, 365, 393, 402, , 406
ESP10, 303, 335, 349, 377, 406, 404, , 408
ESP10, 296, 328, 343, 368, 401, 407, , 411
ESP10, 303, 333, 352, 374, 407, 409, , 413
ESP10, 304, 333, 351, 377, 406, 411, , 415
ESP10, 310, 337, 355, 382, 410, 414, , 418
ESP10, 314, 336, 356, 384, 410, 416, , 420
ESP10, 318, 342, 357, 388, 412, 419, , 423
ESP10, 321, 342, 360, 388, 411, 421, , 425
ESP10, 315, 337, 356, 381, 403, 423, , 427
ESP10, 310, 330, 352, 375, 399, 426, , 430
ESP10, 301, 324, 345, 366, 390, 428, , 432
ESP10, 304, 331, 352, 368, 392, 431, , 435
ESP10, 300, 328, 350, 366, 389, 433, , 437
ESP10, 292, 319, 346, 360, 380, 435, , 439
ESP10, 283, 314, 341, 355, 373, 438, , 442
ESP10, 281, 312, 340, 354, 367, 440, , 444
ESP10, 278, 310, 337, 353, 368, 443, , 447
ESP10, 271, 302, 329, 344, 359, 445, , 449
ESP10, 273, 304, 329, 344, 360, 447, , 451
ESP10, 266, 295, 317, 333, 349, 450, , 454
ESP10, 280, 308, 330, 344, 363, 452, , 456
ESP10, 279, 307, 326, 342, 360, 455, , 459
ESP10, 271, 302, 319, 337, 354, 457, , 461
ESP10, 276, 305, 320, 340, 355, 459, , 463
ESP10, 281, 310, 325, 346, 362, 462, , 466
ESP10, 279, 308, 326, 345, 359, 464, , 468
ESP10, 276, 306, 322, 342, 356, 467, , 471
ESP10, 271, 301, 318, 337, 351, 469, , 473
ESP10, 273, 303, 321, 344, 354, 471, , 475
ESP10, 276, 304, 321, 343, 357, 474, , 478
ESP10, 280, 306, 327, 345, 359, 476, , 480
ESP10, 283, 305, 326, 343, 358, 479, , 483
ESP10, 291, 308, 328, 345, 363, 481, , 485
ESP10, 296, 308, 328, 343, 363, 483, , 487
ESP10, 283, 298, 319, 333, 353, 486, , 490
ESP10, 278, 294, 315, 327, 347, 488, , 492
ESP10, 282, 300, 318, 334, 351, 491, , 495
ESP10, 278, 296, 315, 334, 349, 493, , 497
ESP10, 279, 298, 321, 339, 349, 495, , 499
ESP10, 281, 304, 327, 343, 356, 498, , 502
ESP10, 283, 306, 327, 346, 360, 500, , 504
ESP10, 290, 313, 337, 353, 365, 503, , 507
ESP10, 294, 313, 339, 354, 367, 505, , 509
ESP10, 291, 312, 337, 349, 365, 507, , 511
ESP10, 296, 321, 342, 355, 370, 510, , 514
ESP10, 295, 321, 342, 357, 369, 512, , 516
ESP10, 292, 318, 342, 358, 368, 515, , 519
ESP10, 295, 318, 342, 359, 367, 517, , 521
ESP10, 297, 325, 347, 363, 370, 519, , 523
ESP10, 296, 320, 344, 359, 365, 522, , 526
ESP10, 291, 314, 338, 352, 359, 524, , 528
ESP10, 288, 314, 334, 348, 355, 527, , 531
ESP10, 289, 314, 335, 348, 355, 529, , 533
ESP10, 288, 314, 335, 349, 356, 531, , 535
ESP10, 292, 317, 338, 352, 359, 534, , 538
ESP10, 290, 317, 335, 348, 354, 536, , 540
ESP10, 303, 326, 343, 356, 362, 539, , 543
ESP10, 299, 321, 341, 354, 360, 541, , 545
ESP10, 307, 328, 344, 357, 364, 543, , 547
ESP10, 310, 325, 344, 354, 362, 546, , 550
ESP10, 310, 325, 344, 354, 362, 548, , 552
ESP10, 313, 328, 344, 358, 364, 551, , 555
ESP10, 315, 329, 348, 360, 366, 553, , 557
ESP10, 316, 334, 351, 361, 368, 555, , 559
ESP10, 324, 344, 360, 370, 380, 558, , 562
ESP10, 323, 343, 358, 369, 379, 560, , 564
ESP10, 324, 345, 359, 370, 380, 563, , 567
ESP10, 323, 345, 358, 367, 379, 565, , 569
ESP10, 321, 346, 357, 366, 379, 567, , 571
ESP10, 323, 348, 359, 368, 380, 570, , 574
ESP10, 324, 347, 359, 367, 380, 572, , 576
ESP10, 325, 348, 360, 370, 380, 575, , 579
ESP10, 332, 352, 365, 374, 384, 577, , 581
ESP10, 334, 357, 367, 376, 389, 580, , 584
ESP10, 335, 357, 369, 378, 389, 582, , 586
ESP10, 335, 357, 369, 379, 387, 584, , 588
ESP10, 335, 356, 369, 378, 386, 587, , 591
ESP10, 336, 357, 369, 379, 385, 589, , 593
ESP10, 336, 355, 369, 380, 384, 592, , 596
ESP10, 336, 354, 368, 380, 386, 594, , 598
ESP10, 337, 357, 366, 380, 386, 596, , 600
ESP10, 340, 360, 367, 381, 386, 599, , 603
ESP10, 340, 358, 366, 380, 384, 601, , 605
ESP10, 342, 358, 366, 379, 383, 604, , 608
ESP10, 344, 358, 369, 380, 386, 606, , 610
ESP10, 342, 355, 368, 378, 384, 608, , 612
ESP10, 345, 355, 369, 379, 386, 611, , 615
ESP10, 346, 353, 368, 378, 385, 613, , 617
ESP10, 348, 355, 372, 379, 385, 616, , 620
ESP10, 351, 358, 374, 381, 386, 618, , 622
ESP10, 354, 364, 377, 385, 390, 620, , 624
ESP10, 350, 360, 373, 381, 386, 623, , 627
ESP10, 349, 359, 371, 379, 384, 625, , 629
ESP10, 351, 364, 371, 378, 384, 628, , 632
ESP10, 349, 362, 371, 375, 381, 630, , 634
ESP10, 349, 362, 371, 376, 381, 632, , 636
ESP10, 347, 359, 369, 373, 380, 635, , 639
ESP10, 348, 357, 367, 372, 379, 637, , 641
ESP10, 348, 360, 368, 373, 379, 640, , 644
ESP10, 352, 362, 369, 375, 381, 642, , 646
ESP10, 348, 357, 365, 371, 377, 644, , 648
ESP10, 352, 359, 368, 373, 379, 647, , 651
ESP10, 352, 358, 367, 374, 379, 649, , 653
ESP10, 353, 360, 369, 374, 380, 652, , 656
ESP10, 356, 362, 370, 377, 382, 654, , 658
ESP10, 357, 362, 369, 377, 382, 656, , 660
ESP10, 356, 362, 370, 377, 381, 659, , 663
ESP10, 360, 367, 372, 381, 385, 661, , 665
ESP10, 363, 370, 374, 382, 386, 664, , 668
ESP10, 365, 371, 376, 384, 388, 666, , 670
ESP10, 363, 370, 375, 382, 386, 668, , 672
ESP10, 369, 377, 382, 388, 392, 671, , 675
ESP10, 368, 377, 383, 389, 391, 673, , 677
ESP10, 373, 381, 387, 392, 395, 676, , 680
ESP10, 374, 379, 386, 391, 393, 678, , 682
ESP10, 374, 379, 386, 391, 393, 680, , 684
ESP10, 376, 381, 387, 392, 395, 683, , 687
ESP10, 377, 382, 387, 393, 395, 685, , 689
ESP10, 376, 382, 387, 391, 395, 688, , 692
ESP10, 375, 382, 387, 391, 394, 690, , 694
ESP10, 377, 383, 389, 393, 396, 692, , 696
ESP10, 378, 385, 390, 395, 396, 695, , 699
ESP10, 376, 384, 389, 394, 396, 697, , 701
ESP10, 377, 386, 390, 394, 397, 700, , 704
ESP10, 374, 383, 387, 392, 396, 702, , 706
ESP10, 382, 388, 393, 397, 401, 704, , 708
ESP10, 382, 388, 392, 397, 400, 707, , 711
ESP10, 383, 388, 393, 397, 401, 709, , 713
ESP10, 379, 385, 390, 393, 397, 712, , 716
ESP10, 379, 385, 390, 392, 396, 714, , 718
ESP10, 376, 383, 388, 389, 394, 716, , 720
ESP10, 378, 385, 390, 393, 396, 719, , 723
ESP10, 381, 387, 392, 394, 398, 721, , 725
ESP10, 380, 385, 391, 393, 396, 724, , 728
ESP10, 382, 385, 391, 394, 396, 726, , 730
ESP10, 382, 385, 391, 394, 395, 728, , 732
ESP10, 384, 387, 392, 395, 397, 731, , 735
ESP10, 388, 391, 395, 398, 399, 733, , 737
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|2026-07-05
MCDW1W_SQIN.ESPF10.csv|2026-07-05
MCDW1W_SQIN.ESPFM.csv|2026-07-05
APR-SEP
COLUMBIA - MCNARY DAM
(
MCDW1
)
Forecasts for Water Year
2027
Official Water Supply
ESP with 10 Days QPF
Ensemble:
2026-07-05
Issued:
2026-07-05
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
66218
86315
93
109305
92790
APR-JUL
56816
74386
92
93658
80726
JAN-SEP
79046
102155
91
130275
112028
JAN-JUL
69644
89615
90
114089
99964
OCT-SEP
90696
115971
91
147657
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|2026-07-05
MCDW1W_SQIN.ESPF10.csv|2026-07-05
MCDW1W_SQIN.ESPFM.csv|2026-07-05
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
