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Archive:
Water Year
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BOISE - ARROWROCK DAM
(
ARKI1
)
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
751
753
62
759
1212
APR-JUL
681
681
61
681
1121
APR-AUG
717
718
61
720
1170
JAN-SEP
1039
1041
70
1047
1479
JAN-JUL
970
970
70
970
1388
OCT-SEP
1244
1246
76
1252
1636
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-07-26
Issued:
2026-07-26
Hide Forecast
APR-SEP
751
753
62
758
1212
APR-JUL
681
681
61
681
1121
APR-AUG
717
717
61
720
1170
JAN-SEP
1039
1041
70
1047
1479
JAN-JUL
970
970
70
970
1388
OCT-SEP
1244
1246
76
1251
1636
Reference
ESP with 0 Days QPF
Ensemble:
2026-07-26
Issued:
2026-07-26
Hide Forecast
APR-SEP
751
754
62
760
1212
APR-JUL
681
681
61
682
1121
APR-AUG
717
718
61
722
1170
JAN-SEP
1040
1043
70
1048
1479
JAN-JUL
970
970
70
970
1388
OCT-SEP
1244
1247
76
1253
1636
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 190, 264, 371, 409, 465, 70, , 74
ESP10, 190, 263, 370, 408, 464, 72, , 76
ESP10, 189, 261, 370, 407, 465, 75, , 79
ESP10, 193, 265, 373, 409, 467, 77, , 81
ESP10, 194, 264, 372, 409, 466, 79, , 83
ESP10, 192, 260, 369, 408, 464, 81, , 85
ESP10, 192, 259, 368, 407, 463, 84, , 88
ESP10, 195, 262, 370, 409, 465, 86, , 90
ESP10, 195, 261, 370, 409, 465, 88, , 92
ESP10, 190, 253, 365, 403, 459, 90, , 94
ESP10, 187, 252, 364, 401, 456, 93, , 97
ESP10, 191, 268, 369, 405, 461, 95, , 99
ESP10, 190, 274, 368, 404, 460, 97, , 101
ESP10, 189, 274, 366, 413, 461, 99, , 103
ESP10, 185, 267, 359, 409, 457, 102, , 106
ESP10, 176, 253, 345, 397, 443, 104, , 108
ESP10, 168, 243, 337, 394, 437, 106, , 110
ESP10, 173, 246, 342, 396, 440, 108, , 112
ESP10, 179, 247, 342, 398, 441, 110, , 114
ESP10, 185, 252, 346, 401, 444, 113, , 117
ESP10, 176, 245, 339, 395, 438, 115, , 119
ESP10, 184, 258, 345, 401, 443, 117, , 121
ESP10, 184, 259, 347, 401, 443, 119, , 123
ESP10, 194, 270, 359, 409, 451, 122, , 126
ESP10, 193, 273, 358, 409, 450, 124, , 128
ESP10, 191, 271, 355, 406, 448, 126, , 130
ESP10, 196, 272, 356, 409, 449, 128, , 132
ESP10, 198, 278, 358, 411, 450, 131, , 135
ESP10, 193, 276, 351, 408, 445, 133, , 137
ESP10, 179, 262, 338, 398, 434, 135, , 139
ESP10, 176, 262, 338, 400, 434, 137, , 141
ESP10, 172, 258, 333, 398, 432, 139, , 143
ESP10, 181, 264, 338, 403, 442, 142, , 146
ESP10, 186, 268, 340, 406, 452, 144, , 148
ESP10, 189, 270, 341, 407, 458, 146, , 150
ESP10, 195, 273, 343, 409, 464, 148, , 152
ESP10, 192, 275, 344, 405, 462, 151, , 155
ESP10, 184, 270, 337, 398, 457, 153, , 157
ESP10, 193, 272, 338, 399, 459, 155, , 159
ESP10, 201, 276, 344, 404, 462, 157, , 161
ESP10, 217, 292, 356, 414, 473, 160, , 164
ESP10, 226, 303, 358, 415, 474, 162, , 166
ESP10, 224, 301, 361, 411, 471, 164, , 168
ESP10, 233, 305, 366, 418, 475, 166, , 170
ESP10, 237, 310, 370, 422, 478, 169, , 173
ESP10, 240, 311, 376, 423, 481, 171, , 175
ESP10, 242, 312, 380, 424, 485, 173, , 177
ESP10, 249, 320, 383, 427, 489, 175, , 179
ESP10, 254, 318, 380, 424, 488, 177, , 181
ESP10, 252, 315, 376, 423, 487, 180, , 184
ESP10, 254, 319, 375, 421, 486, 182, , 186
ESP10, 250, 316, 374, 422, 482, 184, , 188
ESP10, 261, 323, 388, 434, 492, 186, , 190
ESP10, 264, 326, 392, 438, 493, 189, , 193
ESP10, 266, 328, 392, 439, 494, 191, , 195
ESP10, 270, 330, 391, 440, 493, 193, , 197
ESP10, 265, 324, 387, 434, 488, 195, , 199
ESP10, 264, 325, 387, 438, 487, 198, , 202
ESP10, 270, 333, 392, 452, 491, 200, , 204
ESP10, 253, 320, 381, 440, 479, 202, , 206
ESP10, 248, 315, 374, 434, 472, 204, , 208
ESP10, 259, 324, 386, 439, 477, 206, , 210
ESP10, 250, 315, 380, 429, 473, 209, , 213
ESP10, 248, 312, 376, 422, 470, 211, , 215
ESP10, 251, 311, 374, 421, 472, 213, , 217
ESP10, 248, 300, 365, 411, 464, 215, , 219
ESP10, 243, 294, 358, 407, 459, 218, , 222
ESP10, 264, 312, 373, 420, 473, 220, , 224
ESP10, 269, 311, 372, 418, 471, 222, , 226
ESP10, 272, 303, 365, 413, 464, 224, , 228
ESP10, 271, 293, 358, 406, 461, 227, , 231
ESP10, 258, 280, 346, 405, 456, 229, , 233
ESP10, 244, 272, 336, 397, 448, 231, , 235
ESP10, 243, 272, 336, 402, 448, 233, , 237
ESP10, 251, 280, 345, 408, 459, 236, , 240
ESP10, 241, 269, 334, 402, 452, 238, , 242
ESP10, 236, 266, 326, 398, 446, 240, , 244
ESP10, 244, 285, 334, 405, 454, 242, , 246
ESP10, 246, 295, 336, 405, 454, 244, , 248
ESP10, 251, 297, 340, 406, 455, 247, , 251
ESP10, 255, 296, 337, 403, 450, 249, , 253
ESP10, 261, 301, 350, 410, 453, 251, , 255
ESP10, 268, 306, 355, 420, 458, 253, , 257
ESP10, 269, 304, 355, 421, 457, 256, , 260
ESP10, 265, 300, 353, 417, 453, 258, , 262
ESP10, 265, 303, 354, 416, 452, 260, , 264
ESP10, 269, 304, 360, 415, 452, 262, , 266
ESP10, 273, 308, 365, 419, 459, 265, , 269
ESP10, 271, 302, 359, 414, 456, 267, , 271
ESP10, 277, 304, 360, 414, 457, 269, , 273
ESP10, 285, 310, 363, 417, 461, 271, , 275
ESP10, 284, 313, 367, 415, 461, 273, , 277
ESP10, 284, 304, 360, 408, 455, 276, , 280
ESP10, 282, 303, 360, 407, 453, 278, , 282
ESP10, 281, 307, 357, 404, 451, 280, , 284
ESP10, 279, 313, 354, 402, 449, 282, , 286
ESP10, 279, 315, 354, 403, 449, 285, , 289
ESP10, 283, 319, 355, 407, 450, 287, , 291
ESP10, 286, 326, 363, 411, 452, 289, , 293
ESP10, 290, 329, 365, 412, 451, 291, , 295
ESP10, 293, 335, 366, 418, 451, 294, , 298
ESP10, 302, 343, 369, 418, 452, 296, , 300
ESP10, 303, 343, 371, 421, 452, 298, , 302
ESP10, 304, 342, 372, 420, 451, 300, , 304
ESP10, 311, 346, 380, 428, 454, 303, , 307
ESP10, 314, 346, 380, 428, 454, 305, , 309
ESP10, 311, 342, 379, 425, 451, 307, , 311
ESP10, 319, 347, 384, 431, 455, 309, , 313
ESP10, 326, 347, 385, 432, 458, 311, , 315
ESP10, 327, 351, 387, 433, 462, 314, , 318
ESP10, 325, 355, 385, 436, 461, 316, , 320
ESP10, 329, 358, 387, 438, 463, 318, , 322
ESP10, 330, 359, 388, 440, 463, 320, , 324
ESP10, 331, 360, 390, 441, 463, 323, , 327
ESP10, 331, 363, 391, 442, 463, 325, , 329
ESP10, 331, 365, 392, 443, 464, 327, , 331
ESP10, 332, 365, 394, 445, 464, 329, , 333
ESP10, 334, 365, 395, 444, 463, 332, , 336
ESP10, 334, 370, 399, 445, 463, 334, , 338
ESP10, 339, 373, 402, 448, 464, 336, , 340
ESP10, 342, 374, 405, 450, 465, 338, , 342
ESP10, 340, 372, 402, 448, 463, 340, , 344
ESP10, 341, 374, 403, 450, 465, 343, , 347
ESP10, 337, 369, 397, 445, 460, 345, , 349
ESP10, 338, 368, 399, 443, 460, 347, , 351
ESP10, 343, 372, 403, 446, 464, 349, , 353
ESP10, 349, 383, 415, 451, 469, 352, , 356
ESP10, 351, 381, 412, 447, 466, 354, , 358
ESP10, 350, 380, 418, 444, 463, 356, , 360
ESP10, 352, 377, 415, 441, 463, 358, , 362
ESP10, 352, 377, 414, 441, 460, 361, , 365
ESP10, 353, 377, 412, 442, 462, 363, , 367
ESP10, 357, 380, 417, 445, 464, 365, , 369
ESP10, 361, 387, 418, 446, 467, 367, , 371
ESP10, 366, 392, 422, 450, 474, 370, , 374
ESP10, 365, 391, 421, 454, 474, 372, , 376
ESP10, 358, 383, 412, 449, 472, 374, , 378
ESP10, 359, 385, 413, 448, 473, 376, , 380
ESP10, 346, 370, 405, 437, 462, 378, , 382
ESP10, 362, 387, 419, 450, 477, 381, , 385
ESP10, 365, 389, 420, 451, 476, 383, , 387
ESP10, 371, 391, 423, 453, 476, 385, , 389
ESP10, 379, 400, 429, 460, 483, 387, , 391
ESP10, 376, 396, 425, 456, 480, 390, , 394
ESP10, 376, 396, 430, 455, 478, 392, , 396
ESP10, 376, 396, 428, 454, 477, 394, , 398
ESP10, 382, 402, 434, 461, 482, 396, , 400
ESP10, 375, 397, 431, 454, 476, 399, , 403
ESP10, 370, 394, 428, 451, 472, 401, , 405
ESP10, 369, 393, 428, 452, 471, 403, , 407
ESP10, 381, 399, 435, 460, 475, 405, , 409
ESP10, 384, 402, 437, 462, 476, 407, , 411
ESP10, 385, 401, 439, 460, 476, 410, , 414
ESP10, 384, 401, 433, 460, 470, 412, , 416
ESP10, 393, 409, 438, 464, 475, 414, , 418
ESP10, 393, 412, 438, 463, 475, 416, , 420
ESP10, 395, 412, 437, 464, 474, 419, , 423
ESP10, 393, 410, 439, 462, 474, 421, , 425
ESP10, 396, 414, 439, 464, 476, 423, , 427
ESP10, 405, 422, 448, 473, 483, 425, , 429
ESP10, 403, 420, 446, 471, 485, 428, , 432
ESP10, 394, 412, 439, 463, 477, 430, , 434
ESP10, 409, 428, 451, 476, 489, 432, , 436
ESP10, 411, 430, 453, 478, 491, 434, , 438
ESP10, 412, 430, 455, 479, 490, 437, , 441
ESP10, 414, 431, 460, 480, 489, 439, , 443
ESP10, 412, 427, 457, 477, 485, 441, , 445
ESP10, 418, 432, 460, 480, 490, 443, , 447
ESP10, 431, 439, 466, 486, 495, 445, , 449
ESP10, 432, 443, 466, 488, 495, 448, , 452
ESP10, 432, 446, 469, 488, 495, 450, , 454
ESP10, 435, 454, 471, 491, 498, 452, , 456
ESP10, 432, 454, 472, 491, 496, 454, , 458
ESP10, 419, 444, 461, 479, 485, 457, , 461
ESP10, 415, 441, 460, 475, 482, 459, , 463
ESP10, 423, 446, 464, 478, 484, 461, , 465
ESP10, 419, 441, 461, 474, 484, 463, , 467
ESP10, 423, 442, 462, 474, 484, 466, , 470
ESP10, 426, 445, 468, 477, 488, 468, , 472
ESP10, 425, 449, 467, 477, 488, 470, , 474
ESP10, 424, 449, 468, 478, 487, 472, , 476
ESP10, 426, 449, 470, 478, 487, 474, , 478
ESP10, 429, 448, 469, 479, 486, 477, , 481
ESP10, 438, 454, 474, 486, 492, 479, , 483
ESP10, 436, 451, 470, 484, 491, 481, , 485
ESP10, 435, 452, 471, 484, 492, 483, , 487
ESP10, 435, 451, 469, 483, 490, 486, , 490
ESP10, 439, 458, 475, 486, 493, 488, , 492
ESP10, 432, 449, 466, 479, 487, 490, , 494
ESP10, 440, 456, 473, 486, 493, 492, , 496
ESP10, 441, 459, 472, 485, 492, 495, , 499
ESP10, 432, 453, 468, 477, 484, 497, , 501
ESP10, 430, 451, 467, 476, 484, 499, , 503
ESP10, 424, 442, 457, 467, 476, 501, , 505
ESP10, 429, 449, 461, 469, 477, 504, , 508
ESP10, 428, 452, 463, 469, 478, 506, , 510
ESP10, 427, 452, 461, 469, 478, 508, , 512
ESP10, 426, 451, 463, 469, 477, 510, , 514
ESP10, 427, 447, 459, 466, 474, 512, , 516
ESP10, 425, 447, 458, 465, 473, 515, , 519
ESP10, 424, 446, 456, 463, 471, 517, , 521
ESP10, 424, 447, 458, 465, 472, 519, , 523
ESP10, 436, 452, 464, 469, 476, 521, , 525
ESP10, 444, 457, 469, 475, 480, 524, , 528
ESP10, 444, 459, 470, 477, 481, 526, , 530
ESP10, 446, 460, 470, 479, 483, 528, , 532
ESP10, 446, 461, 469, 477, 481, 530, , 534
ESP10, 443, 460, 467, 475, 479, 533, , 537
ESP10, 450, 464, 470, 478, 481, 535, , 539
ESP10, 450, 464, 471, 479, 481, 537, , 541
ESP10, 449, 464, 470, 478, 480, 539, , 543
ESP10, 450, 464, 470, 479, 482, 541, , 545
ESP10, 450, 464, 471, 479, 482, 544, , 548
ESP10, 450, 465, 471, 479, 483, 546, , 550
ESP10, 452, 466, 472, 479, 483, 548, , 552
ESP10, 453, 466, 471, 478, 482, 550, , 554
ESP10, 454, 467, 472, 478, 481, 553, , 557
ESP10, 447, 461, 467, 472, 476, 555, , 559
ESP10, 448, 461, 467, 472, 474, 557, , 561
ESP10, 443, 457, 463, 469, 471, 559, , 563
ESP10, 445, 459, 464, 471, 472, 562, , 566
ESP10, 444, 457, 462, 469, 470, 564, , 568
ESP10, 450, 459, 465, 471, 472, 566, , 570
ESP10, 453, 460, 466, 471, 472, 568, , 572
ESP10, 453, 460, 465, 469, 471, 571, , 575
ESP10, 452, 460, 465, 468, 470, 573, , 577
ESP10, 452, 460, 464, 467, 468, 575, , 579
ESP10, 453, 461, 465, 466, 467, 577, , 581
ESP10, 452, 459, 464, 465, 466, 579, , 583
ESP10, 452, 460, 464, 465, 466, 582, , 586
ESP10, 451, 459, 464, 465, 466, 584, , 588
ESP10, 452, 460, 464, 465, 466, 586, , 590
ESP10, 453, 461, 464, 465, 466, 588, , 592
ESP10, 453, 459, 464, 465, 466, 591, , 595
ESP10, 452, 458, 462, 464, 464, 593, , 597
ESP10, 454, 461, 463, 464, 465, 595, , 599
ESP10, 455, 460, 462, 463, 464, 597, , 601
ESP10, 454, 458, 459, 460, 460, 600, , 604
ESP10, 450, 452, 452, 453, 454, 602, , 606
ESP10, 450, 452, 452, 453, 454, 604, , 608
ESP10, 450, 451, 452, 453, 453, 606, , 610
ESP10, 449, 450, 451, 452, 453, 608, , 612
ESP10, 449, 450, 451, 452, 452, 611, , 615
ESP10, 449, 450, 451, 452, 452, 613, , 617
ESP10, 449, 450, 451, 451, 452, 615, , 619
ESP10, 448, 449, 450, 451, 452, 617, , 621
ESP10, 447, 449, 450, 450, 451, 620, , 624
ESP10, 447, 449, 450, 450, 451, 622, , 626
ESP10, 448, 449, 450, 450, 451, 624, , 628
ESP10, 448, 449, 450, 450, 451, 626, , 630
ESP10, 448, 449, 450, 450, 451, 629, , 633
ESP10, 447, 448, 449, 450, 450, 631, , 635
ESP10, 447, 448, 449, 450, 450, 633, , 637
ESP10, 447, 447, 449, 449, 449, 635, , 639
ESP10, 447, 448, 449, 449, 450, 638, , 642
ESP10, 447, 448, 449, 449, 449, 640, , 644
ESP10, 447, 447, 449, 449, 449, 642, , 646
ESP10, 447, 447, 448, 449, 449, 644, , 648
ESP10, 447, 447, 448, 449, 449, 646, , 650
ESP10, 446, 447, 448, 448, 449, 649, , 653
ESP10, 447, 447, 448, 448, 449, 651, , 655
ESP10, 443, 444, 445, 445, 445, 653, , 657
ESP10, 443, 444, 445, 445, 445, 655, , 659
ESP10, 443, 443, 444, 445, 445, 658, , 662
ESP10, 443, 443, 444, 444, 445, 660, , 664
ESP10, 442, 443, 444, 444, 444, 662, , 666
ESP10, 442, 442, 443, 444, 444, 664, , 668
ESP10, 442, 442, 443, 443, 444, 667, , 671
ESP10, 442, 442, 443, 443, 444, 669, , 673
ESP10, 442, 442, 443, 443, 444, 671, , 675
ESP10, 441, 441, 442, 443, 443, 673, , 677
ESP10, 439, 439, 440, 441, 441, 675, , 679
ESP10, 438, 439, 440, 440, 440, 678, , 682
ESP10, 438, 438, 439, 439, 440, 680, , 684
ESP10, 438, 439, 440, 440, 440, 682, , 686
ESP10, 440, 440, 441, 441, 442, 684, , 688
ESP10, 440, 440, 441, 441, 442, 687, , 691
ESP10, 440, 440, 441, 442, 442, 689, , 693
ESP10, 440, 440, 441, 442, 442, 691, , 695
ESP10, 440, 440, 441, 442, 442, 693, , 697
ESP10, 440, 441, 441, 442, 442, 696, , 700
ESP10, 440, 441, 441, 442, 442, 698, , 702
ESP10, 440, 441, 441, 442, 442, 700, , 704
ESP10, 440, 441, 442, 442, 442, 702, , 706
ESP10, 440, 441, 441, 442, 442, 705, , 709
ESP10, 441, 441, 442, 442, 442, 707, , 711
ESP10, 440, 441, 441, 442, 442, 709, , 713
ESP10, 440, 441, 441, 442, 442, 711, , 715
ESP10, 440, 441, 441, 441, 442, 713, , 717
ESP10, 440, 441, 441, 442, 442, 716, , 720
ESP10, 440, 441, 441, 442, 442, 718, , 722
ESP10, 440, 441, 441, 442, 442, 720, , 724
ESP10, 440, 441, 441, 442, 442, 722, , 726
ESP10, 440, 441, 441, 442, 442, 725, , 729
ESP10, 440, 441, 442, 442, 442, 727, , 731
ESP10, 440, 441, 442, 442, 442, 729, , 733
ESP10, 440, 441, 442, 442, 442, 731, , 735
ESP10, 441, 441, 442, 442, 442, 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/ARKI1N_SQIN.ESPF10.csv
ARKI1N_SQIN.ESPF0.csv|2026-07-26
ARKI1N_SQIN.ESPF10.csv|2026-07-26
ARKI1N_SQIN.ESPFM.csv|2026-07-26
APR-SEP
BOISE - ARROWROCK DAM
(
ARKI1
)
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
582
1064
88
1999
1212
APR-JUL
522
979
87
1857
1121
APR-AUG
553
1026
88
1937
1170
JAN-SEP
729
1239
84
2311
1479
JAN-JUL
676
1157
83
2162
1388
OCT-SEP
850
1387
85
2454
1636
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/ARKI1N_SQIN.ESPF10.csv
ARKI1N_SQIN.ESPF0.csv|2026-07-26
ARKI1N_SQIN.ESPF10.csv|2026-07-26
ARKI1N_SQIN.ESPFM.csv|2026-07-26
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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