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COLUMBIA - ARROW LAKES (HUGH KEENLEYSIDE DAM)
(
ARDQ2
)
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
23977
24275
101
24586
24059
APR-JUL
20303
20303
108
20303
18779
APR-AUG
22773
22864
103
22941
22135
JAN-SEP
26806
27104
104
27415
25978
JAN-JUL
23132
23132
112
23132
20698
OCT-SEP
29826
30124
104
30435
29084
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
24081
24354
101
24651
24059
APR-JUL
20303
20303
108
20303
18779
APR-AUG
22836
22924
104
23045
22135
JAN-SEP
26910
27183
105
27480
25978
JAN-JUL
23132
23132
112
23132
20698
OCT-SEP
29931
30204
104
30501
29084
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
24043
24315
101
24680
24059
APR-JUL
20303
20303
108
20303
18779
APR-AUG
22744
22862
103
23030
22135
JAN-SEP
26872
27144
104
27509
25978
JAN-JUL
23132
23132
112
23132
20698
OCT-SEP
29893
30164
104
30530
29084
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 246, 304, 342, 379, 444, 70, , 74
ESP10, 241, 298, 339, 375, 438, 72, , 76
ESP10, 244, 301, 344, 376, 440, 74, , 78
ESP10, 241, 300, 348, 376, 437, 76, , 80
ESP10, 236, 296, 346, 370, 431, 78, , 82
ESP10, 235, 296, 348, 371, 438, 81, , 85
ESP10, 240, 301, 355, 374, 449, 83, , 87
ESP10, 241, 301, 356, 379, 451, 85, , 89
ESP10, 245, 302, 358, 383, 454, 87, , 91
ESP10, 240, 299, 358, 380, 454, 89, , 93
ESP10, 245, 300, 358, 384, 456, 91, , 95
ESP10, 242, 297, 354, 379, 451, 93, , 97
ESP10, 230, 288, 343, 371, 440, 95, , 99
ESP10, 236, 293, 350, 378, 444, 97, , 101
ESP10, 240, 298, 351, 380, 447, 99, , 103
ESP10, 232, 290, 340, 376, 437, 102, , 106
ESP10, 227, 284, 339, 373, 433, 104, , 108
ESP10, 246, 298, 353, 388, 445, 106, , 110
ESP10, 245, 298, 350, 389, 444, 108, , 112
ESP10, 243, 296, 347, 385, 440, 110, , 114
ESP10, 236, 291, 341, 379, 435, 112, , 116
ESP10, 224, 281, 331, 377, 424, 114, , 118
ESP10, 231, 283, 340, 380, 426, 116, , 120
ESP10, 232, 283, 339, 379, 426, 118, , 122
ESP10, 233, 285, 341, 380, 429, 120, , 124
ESP10, 248, 297, 362, 394, 440, 122, , 126
ESP10, 246, 293, 357, 395, 440, 125, , 129
ESP10, 255, 292, 357, 394, 438, 127, , 131
ESP10, 248, 292, 347, 385, 427, 129, , 133
ESP10, 251, 286, 338, 378, 419, 131, , 135
ESP10, 254, 289, 343, 380, 426, 133, , 137
ESP10, 256, 297, 342, 380, 431, 135, , 139
ESP10, 255, 300, 340, 384, 432, 137, , 141
ESP10, 266, 306, 346, 388, 439, 139, , 143
ESP10, 268, 309, 353, 393, 441, 141, , 145
ESP10, 263, 305, 351, 392, 433, 143, , 147
ESP10, 262, 303, 354, 391, 433, 145, , 149
ESP10, 253, 297, 346, 386, 423, 148, , 152
ESP10, 265, 309, 355, 396, 433, 150, , 154
ESP10, 258, 303, 349, 394, 429, 152, , 156
ESP10, 251, 300, 343, 385, 421, 154, , 158
ESP10, 250, 302, 342, 381, 418, 156, , 160
ESP10, 272, 324, 357, 394, 433, 158, , 162
ESP10, 281, 330, 366, 402, 440, 160, , 164
ESP10, 273, 323, 357, 396, 430, 162, , 166
ESP10, 282, 328, 364, 405, 435, 164, , 168
ESP10, 276, 326, 360, 400, 429, 166, , 170
ESP10, 276, 326, 364, 402, 435, 169, , 173
ESP10, 266, 320, 358, 397, 426, 171, , 175
ESP10, 266, 321, 359, 397, 430, 173, , 177
ESP10, 277, 330, 367, 407, 440, 175, , 179
ESP10, 272, 323, 360, 399, 432, 177, , 181
ESP10, 271, 322, 360, 397, 428, 179, , 183
ESP10, 280, 332, 369, 409, 434, 181, , 185
ESP10, 276, 332, 368, 408, 430, 183, , 187
ESP10, 271, 332, 362, 402, 426, 185, , 189
ESP10, 268, 332, 362, 402, 428, 187, , 191
ESP10, 269, 334, 360, 399, 433, 189, , 193
ESP10, 265, 330, 362, 394, 430, 192, , 196
ESP10, 266, 324, 357, 390, 429, 194, , 198
ESP10, 254, 315, 351, 378, 422, 196, , 200
ESP10, 255, 314, 350, 381, 423, 198, , 202
ESP10, 257, 319, 350, 383, 424, 200, , 204
ESP10, 249, 307, 346, 372, 425, 202, , 206
ESP10, 243, 303, 340, 368, 424, 204, , 208
ESP10, 244, 302, 341, 372, 422, 206, , 210
ESP10, 249, 308, 348, 379, 427, 208, , 212
ESP10, 235, 296, 336, 369, 413, 210, , 214
ESP10, 207, 268, 310, 347, 386, 212, , 216
ESP10, 205, 266, 306, 348, 384, 215, , 219
ESP10, 210, 271, 313, 354, 391, 217, , 221
ESP10, 217, 279, 320, 363, 399, 219, , 223
ESP10, 217, 284, 320, 363, 399, 221, , 225
ESP10, 207, 275, 310, 356, 395, 223, , 227
ESP10, 200, 272, 303, 351, 389, 225, , 229
ESP10, 192, 266, 295, 345, 384, 227, , 231
ESP10, 191, 265, 291, 347, 381, 229, , 233
ESP10, 190, 259, 284, 341, 378, 231, , 235
ESP10, 180, 243, 267, 328, 364, 233, , 237
ESP10, 176, 236, 265, 321, 362, 236, , 240
ESP10, 184, 240, 269, 326, 365, 238, , 242
ESP10, 177, 234, 267, 316, 356, 240, , 244
ESP10, 185, 246, 275, 328, 363, 242, , 246
ESP10, 188, 255, 280, 335, 366, 244, , 248
ESP10, 185, 251, 281, 331, 361, 246, , 250
ESP10, 181, 246, 282, 325, 355, 248, , 252
ESP10, 184, 248, 282, 326, 361, 250, , 254
ESP10, 187, 248, 281, 328, 359, 252, , 256
ESP10, 193, 247, 284, 325, 357, 254, , 258
ESP10, 197, 251, 287, 326, 357, 256, , 260
ESP10, 194, 248, 288, 325, 353, 259, , 263
ESP10, 196, 247, 285, 327, 351, 261, , 265
ESP10, 195, 246, 285, 326, 349, 263, , 267
ESP10, 200, 253, 289, 327, 353, 265, , 269
ESP10, 200, 246, 285, 320, 353, 267, , 271
ESP10, 205, 245, 283, 321, 357, 269, , 273
ESP10, 199, 240, 278, 316, 357, 271, , 275
ESP10, 194, 232, 271, 310, 352, 273, , 277
ESP10, 192, 227, 267, 309, 349, 275, , 279
ESP10, 191, 223, 260, 305, 342, 277, , 281
ESP10, 186, 220, 258, 303, 340, 279, , 283
ESP10, 188, 223, 257, 304, 340, 282, , 286
ESP10, 187, 224, 255, 303, 337, 284, , 288
ESP10, 190, 224, 263, 302, 337, 286, , 290
ESP10, 189, 223, 259, 298, 338, 288, , 292
ESP10, 191, 226, 259, 301, 340, 290, , 294
ESP10, 196, 226, 260, 302, 341, 292, , 296
ESP10, 196, 231, 261, 309, 341, 294, , 298
ESP10, 198, 233, 266, 311, 347, 296, , 300
ESP10, 202, 239, 272, 314, 353, 298, , 302
ESP10, 211, 242, 278, 318, 357, 300, , 304
ESP10, 216, 247, 280, 321, 365, 303, , 307
ESP10, 214, 246, 279, 321, 365, 305, , 309
ESP10, 218, 252, 286, 326, 369, 307, , 311
ESP10, 217, 253, 286, 324, 368, 309, , 313
ESP10, 208, 246, 276, 315, 358, 311, , 315
ESP10, 215, 256, 282, 318, 362, 313, , 317
ESP10, 216, 258, 284, 324, 364, 315, , 319
ESP10, 217, 264, 285, 328, 365, 317, , 321
ESP10, 214, 263, 288, 327, 362, 319, , 323
ESP10, 211, 260, 284, 324, 358, 321, , 325
ESP10, 203, 249, 271, 318, 347, 323, , 327
ESP10, 194, 240, 263, 312, 340, 326, , 330
ESP10, 209, 247, 273, 317, 348, 328, , 332
ESP10, 208, 246, 270, 313, 348, 330, , 334
ESP10, 211, 243, 270, 311, 344, 332, , 336
ESP10, 207, 243, 268, 307, 341, 334, , 338
ESP10, 220, 254, 279, 315, 354, 336, , 340
ESP10, 226, 259, 282, 316, 355, 338, , 342
ESP10, 216, 251, 274, 309, 346, 340, , 344
ESP10, 220, 257, 276, 316, 347, 342, , 346
ESP10, 222, 259, 277, 320, 347, 344, , 348
ESP10, 218, 254, 271, 314, 339, 346, , 350
ESP10, 221, 260, 275, 318, 343, 349, , 353
ESP10, 220, 261, 279, 317, 342, 351, , 355
ESP10, 210, 249, 268, 309, 338, 353, , 357
ESP10, 209, 247, 267, 311, 336, 355, , 359
ESP10, 215, 253, 273, 317, 340, 357, , 361
ESP10, 207, 245, 267, 309, 333, 359, , 363
ESP10, 211, 250, 272, 317, 338, 361, , 365
ESP10, 205, 247, 264, 308, 330, 363, , 367
ESP10, 210, 252, 272, 314, 335, 365, , 369
ESP10, 208, 247, 268, 313, 331, 367, , 371
ESP10, 216, 253, 271, 316, 336, 370, , 374
ESP10, 212, 249, 270, 311, 332, 372, , 376
ESP10, 213, 250, 267, 308, 328, 374, , 378
ESP10, 217, 250, 268, 312, 329, 376, , 380
ESP10, 207, 243, 257, 302, 318, 378, , 382
ESP10, 202, 232, 249, 292, 308, 380, , 384
ESP10, 190, 218, 238, 279, 293, 382, , 386
ESP10, 185, 221, 232, 274, 286, 384, , 388
ESP10, 181, 216, 231, 268, 281, 386, , 390
ESP10, 172, 207, 228, 259, 272, 388, , 392
ESP10, 169, 203, 230, 257, 269, 390, , 394
ESP10, 168, 198, 226, 253, 264, 393, , 397
ESP10, 169, 203, 228, 252, 264, 395, , 399
ESP10, 159, 192, 215, 241, 252, 397, , 401
ESP10, 167, 189, 211, 237, 250, 399, , 403
ESP10, 155, 181, 200, 226, 240, 401, , 405
ESP10, 161, 184, 204, 231, 243, 403, , 407
ESP10, 157, 179, 197, 226, 239, 405, , 409
ESP10, 150, 169, 188, 222, 231, 407, , 411
ESP10, 136, 156, 177, 208, 218, 409, , 413
ESP10, 154, 169, 190, 220, 234, 411, , 415
ESP10, 148, 163, 186, 214, 228, 413, , 417
ESP10, 150, 162, 183, 209, 224, 416, , 420
ESP10, 152, 164, 187, 212, 227, 418, , 422
ESP10, 158, 172, 192, 215, 230, 420, , 424
ESP10, 155, 169, 188, 210, 228, 422, , 426
ESP10, 155, 169, 190, 208, 225, 424, , 428
ESP10, 153, 171, 190, 208, 222, 426, , 430
ESP10, 164, 183, 200, 220, 232, 428, , 432
ESP10, 167, 181, 200, 219, 231, 430, , 434
ESP10, 167, 179, 197, 219, 229, 432, , 436
ESP10, 161, 173, 191, 213, 222, 434, , 438
ESP10, 166, 174, 194, 214, 226, 437, , 441
ESP10, 177, 186, 206, 225, 237, 439, , 443
ESP10, 177, 187, 208, 225, 238, 441, , 445
ESP10, 180, 191, 213, 232, 244, 443, , 447
ESP10, 179, 192, 214, 233, 244, 445, , 449
ESP10, 188, 205, 224, 243, 258, 447, , 451
ESP10, 193, 207, 227, 246, 260, 449, , 453
ESP10, 190, 209, 226, 245, 258, 451, , 455
ESP10, 192, 212, 231, 246, 262, 453, , 457
ESP10, 195, 209, 231, 248, 261, 455, , 459
ESP10, 194, 208, 231, 248, 259, 457, , 461
ESP10, 190, 203, 226, 244, 254, 460, , 464
ESP10, 188, 200, 226, 242, 251, 462, , 466
ESP10, 187, 200, 225, 242, 250, 464, , 468
ESP10, 181, 196, 220, 236, 246, 466, , 470
ESP10, 179, 194, 218, 234, 244, 468, , 472
ESP10, 177, 191, 216, 233, 241, 470, , 474
ESP10, 183, 197, 225, 240, 246, 472, , 476
ESP10, 185, 206, 226, 242, 248, 474, , 478
ESP10, 185, 207, 226, 243, 249, 476, , 480
ESP10, 186, 207, 225, 242, 250, 478, , 482
ESP10, 191, 210, 229, 245, 254, 480, , 484
ESP10, 189, 206, 227, 244, 252, 483, , 487
ESP10, 189, 208, 226, 242, 258, 485, , 489
ESP10, 189, 210, 227, 244, 257, 487, , 491
ESP10, 193, 215, 231, 250, 261, 489, , 493
ESP10, 200, 220, 236, 256, 266, 491, , 495
ESP10, 201, 220, 237, 255, 266, 493, , 497
ESP10, 212, 233, 247, 265, 279, 495, , 499
ESP10, 215, 236, 249, 266, 283, 497, , 501
ESP10, 215, 236, 249, 267, 284, 499, , 503
ESP10, 213, 234, 250, 265, 283, 501, , 505
ESP10, 215, 235, 250, 266, 284, 504, , 508
ESP10, 222, 239, 255, 269, 288, 506, , 510
ESP10, 221, 240, 253, 268, 286, 508, , 512
ESP10, 222, 241, 257, 271, 287, 510, , 514
ESP10, 224, 244, 260, 274, 289, 512, , 516
ESP10, 229, 247, 261, 275, 291, 514, , 518
ESP10, 228, 247, 261, 277, 290, 516, , 520
ESP10, 227, 248, 260, 279, 290, 518, , 522
ESP10, 225, 248, 261, 278, 292, 520, , 524
ESP10, 228, 250, 264, 281, 294, 522, , 526
ESP10, 228, 251, 266, 281, 293, 524, , 528
ESP10, 228, 250, 267, 280, 294, 527, , 531
ESP10, 227, 252, 267, 280, 293, 529, , 533
ESP10, 225, 249, 265, 278, 289, 531, , 535
ESP10, 223, 248, 264, 277, 290, 533, , 537
ESP10, 218, 243, 260, 275, 286, 535, , 539
ESP10, 216, 241, 258, 274, 287, 537, , 541
ESP10, 217, 242, 260, 276, 288, 539, , 543
ESP10, 216, 243, 259, 276, 285, 541, , 545
ESP10, 212, 240, 256, 274, 284, 543, , 547
ESP10, 222, 247, 262, 280, 290, 545, , 549
ESP10, 223, 248, 266, 280, 290, 547, , 551
ESP10, 232, 256, 274, 289, 301, 550, , 554
ESP10, 229, 252, 270, 285, 298, 552, , 556
ESP10, 226, 247, 266, 279, 293, 554, , 558
ESP10, 228, 251, 268, 280, 293, 556, , 560
ESP10, 227, 250, 267, 280, 291, 558, , 562
ESP10, 231, 252, 270, 283, 293, 560, , 564
ESP10, 221, 242, 260, 272, 282, 562, , 566
ESP10, 226, 247, 266, 279, 286, 564, , 568
ESP10, 229, 246, 262, 275, 286, 566, , 570
ESP10, 238, 254, 271, 286, 294, 568, , 572
ESP10, 229, 245, 261, 276, 287, 571, , 575
ESP10, 230, 240, 257, 274, 286, 573, , 577
ESP10, 227, 238, 254, 272, 282, 575, , 579
ESP10, 234, 243, 261, 278, 289, 577, , 581
ESP10, 232, 243, 260, 276, 286, 579, , 583
ESP10, 235, 247, 262, 278, 291, 581, , 585
ESP10, 242, 253, 269, 283, 295, 583, , 587
ESP10, 246, 258, 276, 290, 299, 585, , 589
ESP10, 244, 256, 276, 290, 299, 587, , 591
ESP10, 241, 254, 273, 287, 295, 589, , 593
ESP10, 238, 251, 273, 285, 292, 591, , 595
ESP10, 254, 266, 286, 300, 306, 594, , 598
ESP10, 255, 268, 286, 300, 309, 596, , 600
ESP10, 264, 277, 295, 307, 317, 598, , 602
ESP10, 259, 273, 290, 304, 313, 600, , 604
ESP10, 257, 272, 291, 303, 311, 602, , 606
ESP10, 258, 273, 293, 304, 311, 604, , 608
ESP10, 260, 278, 296, 306, 313, 606, , 610
ESP10, 254, 271, 290, 301, 307, 608, , 612
ESP10, 254, 270, 290, 300, 306, 610, , 614
ESP10, 259, 277, 294, 306, 312, 612, , 616
ESP10, 261, 281, 296, 309, 315, 614, , 618
ESP10, 262, 282, 294, 308, 313, 617, , 621
ESP10, 263, 282, 299, 308, 314, 619, , 623
ESP10, 258, 278, 295, 304, 312, 621, , 625
ESP10, 280, 297, 313, 322, 333, 623, , 627
ESP10, 273, 290, 308, 316, 325, 625, , 629
ESP10, 276, 293, 312, 321, 328, 627, , 631
ESP10, 271, 288, 307, 316, 322, 629, , 633
ESP10, 274, 288, 309, 316, 323, 631, , 635
ESP10, 273, 292, 309, 316, 324, 633, , 637
ESP10, 282, 296, 315, 322, 329, 635, , 639
ESP10, 285, 296, 315, 322, 330, 638, , 642
ESP10, 284, 292, 313, 320, 328, 640, , 644
ESP10, 287, 292, 313, 321, 327, 642, , 646
ESP10, 284, 290, 312, 320, 326, 644, , 648
ESP10, 292, 301, 321, 327, 334, 646, , 650
ESP10, 308, 315, 331, 337, 341, 648, , 652
ESP10, 308, 317, 330, 337, 341, 650, , 654
ESP10, 308, 319, 330, 338, 340, 652, , 656
ESP10, 308, 320, 329, 337, 340, 654, , 658
ESP10, 307, 319, 330, 336, 340, 656, , 660
ESP10, 310, 319, 331, 337, 340, 658, , 662
ESP10, 308, 317, 329, 335, 337, 661, , 665
ESP10, 304, 317, 326, 332, 334, 663, , 667
ESP10, 302, 315, 324, 330, 334, 665, , 669
ESP10, 305, 320, 329, 333, 337, 667, , 671
ESP10, 305, 320, 328, 332, 336, 669, , 673
ESP10, 308, 319, 326, 330, 334, 671, , 675
ESP10, 311, 320, 327, 331, 335, 673, , 677
ESP10, 312, 322, 328, 332, 337, 675, , 679
ESP10, 311, 321, 327, 331, 338, 677, , 681
ESP10, 310, 320, 326, 331, 337, 679, , 683
ESP10, 310, 320, 327, 331, 337, 681, , 685
ESP10, 309, 319, 326, 330, 336, 684, , 688
ESP10, 312, 318, 326, 330, 335, 686, , 690
ESP10, 313, 321, 327, 331, 336, 688, , 692
ESP10, 314, 322, 327, 332, 336, 690, , 694
ESP10, 315, 321, 327, 331, 336, 692, , 696
ESP10, 315, 322, 327, 331, 335, 694, , 698
ESP10, 315, 322, 328, 331, 336, 696, , 700
ESP10, 313, 321, 326, 329, 334, 698, , 702
ESP10, 312, 321, 325, 329, 334, 700, , 704
ESP10, 316, 323, 327, 330, 334, 702, , 706
ESP10, 316, 322, 327, 330, 334, 705, , 709
ESP10, 318, 321, 327, 329, 333, 707, , 711
ESP10, 320, 322, 327, 330, 333, 709, , 713
ESP10, 318, 321, 326, 328, 332, 711, , 715
ESP10, 319, 323, 326, 328, 332, 713, , 717
ESP10, 318, 323, 326, 328, 332, 715, , 719
ESP10, 319, 323, 326, 329, 331, 717, , 721
ESP10, 316, 321, 324, 327, 330, 719, , 723
ESP10, 315, 321, 324, 327, 330, 721, , 725
ESP10, 315, 321, 324, 327, 330, 723, , 727
ESP10, 316, 321, 325, 328, 331, 725, , 729
ESP10, 317, 322, 326, 328, 332, 728, , 732
ESP10, 320, 324, 327, 330, 334, 730, , 734
ESP10, 319, 323, 326, 328, 333, 732, , 736
ESP10, 319, 323, 326, 328, 332, 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/ARDQ2IW_SQIN.ESPF10.csv
ARDQ2IW_SQIN.ESPF0.csv|2026-08-15
ARDQ2IW_SQIN.ESPF10.csv|2026-08-15
ARDQ2IW_SQIN.ESPFM.csv|2026-08-15
APR-SEP
COLUMBIA - ARROW LAKES (HUGH KEENLEYSIDE DAM)
(
ARDQ2
)
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
18416
23759
99
28459
24059
APR-JUL
14448
18140
97
22025
18779
APR-AUG
17108
21534
97
26211
22135
JAN-SEP
20002
25352
98
30191
25978
JAN-JUL
16046
20142
97
23645
20698
OCT-SEP
22659
27564
95
32530
29084
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/ARDQ2IW_SQIN.ESPF10.csv
ARDQ2IW_SQIN.ESPF0.csv|2026-08-15
ARDQ2IW_SQIN.ESPF10.csv|2026-08-15
ARDQ2IW_SQIN.ESPFM.csv|2026-08-15
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
