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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:
2026-08-16
Issued:
2026-08-16
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
751
752
62
756
1212
APR-JUL
681
681
61
681
1121
APR-AUG
717
717
61
717
1170
JAN-SEP
1039
1041
70
1045
1479
JAN-JUL
969
969
70
969
1388
OCT-SEP
1244
1245
76
1249
1636
Experimental
HEFS with 15 days EQPF
Ensemble:
2026-08-16
Issued:
2026-08-16
Hide Forecast
APR-SEP
751
753
62
756
1212
APR-JUL
681
681
61
681
1121
APR-AUG
717
717
61
718
1170
JAN-SEP
1039
1041
70
1044
1479
JAN-JUL
969
969
70
969
1388
OCT-SEP
1244
1246
76
1249
1636
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-16
Issued:
2026-08-16
Hide Forecast
APR-SEP
751
753
62
759
1212
APR-JUL
681
681
61
681
1121
APR-AUG
717
717
61
719
1170
JAN-SEP
1039
1041
70
1047
1479
JAN-JUL
969
969
70
969
1388
OCT-SEP
1244
1246
76
1252
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, 74, , 78
ESP10, 193, 265, 373, 409, 467, 76, , 80
ESP10, 194, 264, 372, 409, 466, 78, , 82
ESP10, 192, 260, 369, 408, 464, 81, , 85
ESP10, 192, 259, 368, 407, 463, 83, , 87
ESP10, 195, 262, 370, 409, 465, 85, , 89
ESP10, 195, 261, 370, 409, 465, 87, , 91
ESP10, 190, 253, 365, 403, 459, 89, , 93
ESP10, 187, 252, 364, 401, 456, 91, , 95
ESP10, 191, 268, 369, 405, 461, 93, , 97
ESP10, 190, 274, 368, 404, 460, 95, , 99
ESP10, 189, 274, 366, 413, 461, 97, , 101
ESP10, 185, 267, 359, 409, 457, 99, , 103
ESP10, 176, 253, 345, 397, 443, 101, , 105
ESP10, 168, 243, 337, 394, 437, 103, , 107
ESP10, 173, 246, 342, 396, 440, 106, , 110
ESP10, 179, 247, 342, 398, 441, 108, , 112
ESP10, 185, 252, 346, 401, 444, 110, , 114
ESP10, 176, 245, 339, 395, 438, 112, , 116
ESP10, 184, 258, 345, 401, 443, 114, , 118
ESP10, 184, 259, 347, 401, 443, 116, , 120
ESP10, 194, 270, 359, 409, 451, 118, , 122
ESP10, 193, 273, 358, 409, 450, 120, , 124
ESP10, 191, 271, 355, 406, 448, 122, , 126
ESP10, 196, 272, 356, 409, 449, 124, , 128
ESP10, 198, 278, 358, 411, 450, 126, , 130
ESP10, 193, 276, 351, 408, 445, 129, , 133
ESP10, 179, 262, 338, 398, 434, 131, , 135
ESP10, 176, 262, 338, 400, 434, 133, , 137
ESP10, 172, 258, 333, 398, 432, 135, , 139
ESP10, 181, 264, 338, 403, 442, 137, , 141
ESP10, 186, 268, 340, 406, 452, 139, , 143
ESP10, 189, 270, 341, 407, 458, 141, , 145
ESP10, 195, 273, 343, 409, 464, 143, , 147
ESP10, 192, 275, 344, 405, 462, 145, , 149
ESP10, 184, 270, 337, 398, 457, 147, , 151
ESP10, 193, 272, 338, 399, 459, 149, , 153
ESP10, 201, 276, 344, 404, 462, 151, , 155
ESP10, 217, 292, 356, 414, 473, 154, , 158
ESP10, 226, 303, 358, 415, 474, 156, , 160
ESP10, 224, 301, 361, 411, 471, 158, , 162
ESP10, 233, 305, 366, 418, 475, 160, , 164
ESP10, 237, 310, 370, 422, 478, 162, , 166
ESP10, 240, 311, 376, 423, 481, 164, , 168
ESP10, 242, 312, 380, 424, 485, 166, , 170
ESP10, 249, 320, 383, 427, 489, 168, , 172
ESP10, 254, 318, 380, 424, 488, 170, , 174
ESP10, 252, 315, 376, 423, 487, 172, , 176
ESP10, 254, 319, 375, 421, 486, 174, , 178
ESP10, 250, 316, 374, 422, 482, 177, , 181
ESP10, 261, 323, 388, 434, 492, 179, , 183
ESP10, 264, 326, 392, 438, 493, 181, , 185
ESP10, 266, 328, 392, 439, 494, 183, , 187
ESP10, 270, 330, 391, 440, 493, 185, , 189
ESP10, 265, 324, 387, 434, 488, 187, , 191
ESP10, 264, 325, 387, 438, 487, 189, , 193
ESP10, 270, 333, 392, 452, 491, 191, , 195
ESP10, 253, 320, 381, 440, 479, 193, , 197
ESP10, 248, 315, 374, 434, 472, 195, , 199
ESP10, 259, 324, 386, 439, 477, 197, , 201
ESP10, 250, 315, 380, 429, 473, 199, , 203
ESP10, 248, 312, 376, 422, 470, 202, , 206
ESP10, 251, 311, 374, 421, 472, 204, , 208
ESP10, 248, 300, 365, 411, 464, 206, , 210
ESP10, 243, 294, 358, 407, 459, 208, , 212
ESP10, 264, 312, 373, 420, 473, 210, , 214
ESP10, 269, 311, 372, 418, 471, 212, , 216
ESP10, 272, 303, 365, 413, 464, 214, , 218
ESP10, 271, 293, 358, 406, 461, 216, , 220
ESP10, 258, 280, 346, 405, 456, 218, , 222
ESP10, 244, 272, 336, 397, 448, 220, , 224
ESP10, 243, 272, 336, 402, 448, 222, , 226
ESP10, 251, 280, 345, 408, 459, 225, , 229
ESP10, 241, 269, 334, 402, 452, 227, , 231
ESP10, 236, 266, 326, 398, 446, 229, , 233
ESP10, 244, 285, 334, 405, 454, 231, , 235
ESP10, 246, 295, 336, 405, 454, 233, , 237
ESP10, 251, 297, 340, 406, 455, 235, , 239
ESP10, 255, 296, 337, 403, 450, 237, , 241
ESP10, 261, 301, 350, 410, 453, 239, , 243
ESP10, 268, 306, 355, 420, 458, 241, , 245
ESP10, 269, 304, 355, 421, 457, 243, , 247
ESP10, 265, 300, 353, 417, 453, 245, , 249
ESP10, 265, 303, 354, 416, 452, 248, , 252
ESP10, 269, 304, 360, 415, 452, 250, , 254
ESP10, 273, 308, 365, 419, 459, 252, , 256
ESP10, 271, 302, 359, 414, 456, 254, , 258
ESP10, 277, 304, 360, 414, 457, 256, , 260
ESP10, 285, 310, 363, 417, 461, 258, , 262
ESP10, 284, 313, 367, 415, 461, 260, , 264
ESP10, 284, 304, 360, 408, 455, 262, , 266
ESP10, 282, 303, 360, 407, 453, 264, , 268
ESP10, 281, 307, 357, 404, 451, 266, , 270
ESP10, 279, 313, 354, 402, 449, 268, , 272
ESP10, 279, 315, 354, 403, 449, 270, , 274
ESP10, 283, 319, 355, 407, 450, 273, , 277
ESP10, 286, 326, 363, 411, 452, 275, , 279
ESP10, 290, 329, 365, 412, 451, 277, , 281
ESP10, 293, 335, 366, 418, 451, 279, , 283
ESP10, 302, 343, 369, 418, 452, 281, , 285
ESP10, 303, 343, 371, 421, 452, 283, , 287
ESP10, 304, 342, 372, 420, 451, 285, , 289
ESP10, 311, 346, 380, 428, 454, 287, , 291
ESP10, 314, 346, 380, 428, 454, 289, , 293
ESP10, 311, 342, 379, 425, 451, 291, , 295
ESP10, 319, 347, 384, 431, 455, 293, , 297
ESP10, 326, 347, 385, 432, 458, 296, , 300
ESP10, 327, 351, 387, 433, 462, 298, , 302
ESP10, 325, 355, 385, 436, 461, 300, , 304
ESP10, 329, 358, 387, 438, 463, 302, , 306
ESP10, 330, 359, 388, 440, 463, 304, , 308
ESP10, 331, 360, 390, 441, 463, 306, , 310
ESP10, 331, 363, 391, 442, 463, 308, , 312
ESP10, 331, 365, 392, 443, 464, 310, , 314
ESP10, 332, 365, 394, 445, 464, 312, , 316
ESP10, 334, 365, 395, 444, 463, 314, , 318
ESP10, 334, 370, 399, 445, 463, 316, , 320
ESP10, 339, 373, 402, 448, 464, 318, , 322
ESP10, 342, 374, 405, 450, 465, 321, , 325
ESP10, 340, 372, 402, 448, 463, 323, , 327
ESP10, 341, 374, 403, 450, 465, 325, , 329
ESP10, 337, 369, 397, 445, 460, 327, , 331
ESP10, 338, 368, 399, 443, 460, 329, , 333
ESP10, 343, 372, 403, 446, 464, 331, , 335
ESP10, 349, 383, 415, 451, 469, 333, , 337
ESP10, 351, 381, 412, 447, 466, 335, , 339
ESP10, 350, 380, 418, 444, 463, 337, , 341
ESP10, 352, 377, 415, 441, 463, 339, , 343
ESP10, 352, 377, 414, 441, 460, 341, , 345
ESP10, 353, 377, 412, 442, 462, 344, , 348
ESP10, 357, 380, 417, 445, 464, 346, , 350
ESP10, 361, 387, 418, 446, 467, 348, , 352
ESP10, 366, 392, 422, 450, 474, 350, , 354
ESP10, 365, 391, 421, 454, 474, 352, , 356
ESP10, 358, 383, 412, 449, 472, 354, , 358
ESP10, 359, 385, 413, 448, 473, 356, , 360
ESP10, 346, 370, 405, 437, 462, 358, , 362
ESP10, 362, 387, 419, 450, 477, 360, , 364
ESP10, 365, 389, 420, 451, 476, 362, , 366
ESP10, 371, 391, 423, 453, 476, 364, , 368
ESP10, 379, 400, 429, 460, 483, 366, , 370
ESP10, 376, 396, 425, 456, 480, 369, , 373
ESP10, 376, 396, 430, 455, 478, 371, , 375
ESP10, 376, 396, 428, 454, 477, 373, , 377
ESP10, 382, 402, 434, 461, 482, 375, , 379
ESP10, 375, 397, 431, 454, 476, 377, , 381
ESP10, 370, 394, 428, 451, 472, 379, , 383
ESP10, 369, 393, 428, 452, 471, 381, , 385
ESP10, 381, 399, 435, 460, 475, 383, , 387
ESP10, 384, 402, 437, 462, 476, 385, , 389
ESP10, 385, 401, 439, 460, 476, 387, , 391
ESP10, 384, 401, 433, 460, 470, 389, , 393
ESP10, 393, 409, 438, 464, 475, 392, , 396
ESP10, 393, 412, 438, 463, 475, 394, , 398
ESP10, 395, 412, 437, 464, 474, 396, , 400
ESP10, 393, 410, 439, 462, 474, 398, , 402
ESP10, 396, 414, 439, 464, 476, 400, , 404
ESP10, 405, 422, 448, 473, 483, 402, , 406
ESP10, 403, 420, 446, 471, 485, 404, , 408
ESP10, 394, 412, 439, 463, 477, 406, , 410
ESP10, 409, 428, 451, 476, 489, 408, , 412
ESP10, 411, 430, 453, 478, 491, 410, , 414
ESP10, 412, 430, 455, 479, 490, 412, , 416
ESP10, 414, 431, 460, 480, 489, 414, , 418
ESP10, 412, 427, 457, 477, 485, 417, , 421
ESP10, 418, 432, 460, 480, 490, 419, , 423
ESP10, 431, 439, 466, 486, 495, 421, , 425
ESP10, 432, 443, 466, 488, 495, 423, , 427
ESP10, 432, 446, 469, 488, 495, 425, , 429
ESP10, 435, 454, 471, 491, 498, 427, , 431
ESP10, 432, 454, 472, 491, 496, 429, , 433
ESP10, 419, 444, 461, 479, 485, 431, , 435
ESP10, 415, 441, 460, 475, 482, 433, , 437
ESP10, 423, 446, 464, 478, 484, 435, , 439
ESP10, 419, 441, 461, 474, 484, 437, , 441
ESP10, 423, 442, 462, 474, 484, 440, , 444
ESP10, 426, 445, 468, 477, 488, 442, , 446
ESP10, 425, 449, 467, 477, 488, 444, , 448
ESP10, 424, 449, 468, 478, 487, 446, , 450
ESP10, 426, 449, 470, 478, 487, 448, , 452
ESP10, 429, 448, 469, 479, 486, 450, , 454
ESP10, 438, 454, 474, 486, 492, 452, , 456
ESP10, 436, 451, 470, 484, 491, 454, , 458
ESP10, 435, 452, 471, 484, 492, 456, , 460
ESP10, 435, 451, 469, 483, 490, 458, , 462
ESP10, 439, 458, 475, 486, 493, 460, , 464
ESP10, 432, 449, 466, 479, 487, 462, , 466
ESP10, 440, 456, 473, 486, 493, 465, , 469
ESP10, 441, 459, 472, 485, 492, 467, , 471
ESP10, 432, 453, 468, 477, 484, 469, , 473
ESP10, 430, 451, 467, 476, 484, 471, , 475
ESP10, 424, 442, 457, 467, 476, 473, , 477
ESP10, 429, 449, 461, 469, 477, 475, , 479
ESP10, 428, 452, 463, 469, 478, 477, , 481
ESP10, 427, 452, 461, 469, 478, 479, , 483
ESP10, 426, 451, 463, 469, 477, 481, , 485
ESP10, 427, 447, 459, 466, 474, 483, , 487
ESP10, 425, 447, 458, 465, 473, 485, , 489
ESP10, 424, 446, 456, 463, 471, 488, , 492
ESP10, 424, 447, 458, 465, 472, 490, , 494
ESP10, 436, 452, 464, 469, 476, 492, , 496
ESP10, 444, 457, 469, 475, 480, 494, , 498
ESP10, 444, 459, 470, 477, 481, 496, , 500
ESP10, 446, 460, 470, 479, 483, 498, , 502
ESP10, 446, 461, 469, 477, 481, 500, , 504
ESP10, 443, 460, 467, 475, 479, 502, , 506
ESP10, 450, 464, 470, 478, 481, 504, , 508
ESP10, 450, 464, 471, 479, 481, 506, , 510
ESP10, 449, 464, 470, 478, 480, 508, , 512
ESP10, 450, 464, 470, 479, 482, 510, , 514
ESP10, 450, 464, 471, 479, 482, 513, , 517
ESP10, 450, 465, 471, 479, 483, 515, , 519
ESP10, 452, 466, 472, 479, 483, 517, , 521
ESP10, 453, 466, 471, 478, 482, 519, , 523
ESP10, 454, 467, 472, 478, 481, 521, , 525
ESP10, 447, 461, 467, 472, 476, 523, , 527
ESP10, 448, 461, 467, 472, 474, 525, , 529
ESP10, 443, 457, 463, 469, 471, 527, , 531
ESP10, 445, 459, 464, 471, 472, 529, , 533
ESP10, 444, 457, 462, 469, 470, 531, , 535
ESP10, 450, 459, 465, 471, 472, 533, , 537
ESP10, 453, 460, 466, 471, 472, 536, , 540
ESP10, 453, 460, 465, 469, 471, 538, , 542
ESP10, 452, 460, 465, 468, 470, 540, , 544
ESP10, 452, 460, 464, 467, 468, 542, , 546
ESP10, 453, 461, 465, 466, 467, 544, , 548
ESP10, 452, 459, 464, 465, 466, 546, , 550
ESP10, 452, 460, 464, 465, 466, 548, , 552
ESP10, 451, 459, 464, 465, 466, 550, , 554
ESP10, 452, 460, 464, 465, 466, 552, , 556
ESP10, 453, 461, 464, 465, 466, 554, , 558
ESP10, 453, 459, 464, 465, 466, 556, , 560
ESP10, 452, 458, 462, 464, 464, 558, , 562
ESP10, 454, 461, 463, 464, 465, 561, , 565
ESP10, 455, 460, 462, 463, 464, 563, , 567
ESP10, 454, 458, 459, 460, 460, 565, , 569
ESP10, 450, 452, 452, 453, 454, 567, , 571
ESP10, 450, 452, 452, 453, 454, 569, , 573
ESP10, 450, 451, 452, 453, 453, 571, , 575
ESP10, 449, 450, 451, 452, 453, 573, , 577
ESP10, 449, 450, 451, 452, 452, 575, , 579
ESP10, 449, 450, 451, 452, 452, 577, , 581
ESP10, 449, 450, 451, 451, 452, 579, , 583
ESP10, 448, 449, 450, 451, 452, 581, , 585
ESP10, 447, 449, 450, 450, 451, 584, , 588
ESP10, 447, 449, 450, 450, 451, 586, , 590
ESP10, 448, 449, 450, 450, 451, 588, , 592
ESP10, 448, 449, 450, 450, 451, 590, , 594
ESP10, 448, 449, 450, 450, 451, 592, , 596
ESP10, 447, 448, 449, 450, 450, 594, , 598
ESP10, 447, 448, 449, 450, 450, 596, , 600
ESP10, 447, 447, 449, 449, 449, 598, , 602
ESP10, 447, 448, 449, 449, 450, 600, , 604
ESP10, 447, 448, 449, 449, 449, 602, , 606
ESP10, 447, 447, 449, 449, 449, 604, , 608
ESP10, 447, 447, 448, 449, 449, 607, , 611
ESP10, 447, 447, 448, 449, 449, 609, , 613
ESP10, 446, 447, 448, 448, 449, 611, , 615
ESP10, 447, 447, 448, 448, 449, 613, , 617
ESP10, 443, 444, 445, 445, 445, 615, , 619
ESP10, 443, 444, 445, 445, 445, 617, , 621
ESP10, 443, 443, 444, 445, 445, 619, , 623
ESP10, 443, 443, 444, 444, 445, 621, , 625
ESP10, 442, 443, 444, 444, 444, 623, , 627
ESP10, 442, 442, 443, 444, 444, 625, , 629
ESP10, 442, 442, 443, 443, 444, 627, , 631
ESP10, 442, 442, 443, 443, 444, 629, , 633
ESP10, 442, 442, 443, 443, 444, 632, , 636
ESP10, 441, 441, 442, 443, 443, 634, , 638
ESP10, 439, 439, 440, 441, 441, 636, , 640
ESP10, 438, 439, 440, 440, 440, 638, , 642
ESP10, 438, 438, 439, 439, 440, 640, , 644
ESP10, 438, 439, 440, 440, 440, 642, , 646
ESP10, 440, 440, 441, 441, 442, 644, , 648
ESP10, 440, 440, 441, 441, 442, 646, , 650
ESP10, 440, 440, 441, 442, 442, 648, , 652
ESP10, 440, 440, 441, 442, 442, 650, , 654
ESP10, 440, 440, 441, 442, 442, 652, , 656
ESP10, 440, 441, 441, 442, 442, 655, , 659
ESP10, 440, 441, 441, 442, 442, 657, , 661
ESP10, 440, 441, 441, 442, 442, 659, , 663
ESP10, 440, 441, 442, 442, 442, 661, , 665
ESP10, 440, 441, 441, 442, 442, 663, , 667
ESP10, 441, 441, 442, 442, 442, 665, , 669
ESP10, 440, 441, 441, 442, 442, 667, , 671
ESP10, 440, 441, 441, 442, 442, 669, , 673
ESP10, 440, 441, 441, 441, 442, 671, , 675
ESP10, 440, 441, 441, 442, 442, 673, , 677
ESP10, 440, 441, 441, 442, 442, 675, , 679
ESP10, 440, 441, 441, 442, 442, 677, , 681
ESP10, 440, 441, 441, 442, 442, 680, , 684
ESP10, 440, 441, 441, 442, 442, 682, , 686
ESP10, 440, 441, 442, 442, 442, 684, , 688
ESP10, 440, 441, 442, 442, 442, 686, , 690
ESP10, 440, 441, 442, 442, 442, 688, , 692
ESP10, 441, 441, 442, 442, 442, 690, , 694
ESP10, 440, 441, 441, 442, 442, 692, , 696
ESP10, 440, 441, 441, 442, 442, 694, , 698
ESP10, 440, 441, 442, 442, 442, 696, , 700
ESP10, 441, 441, 442, 442, 442, 698, , 702
ESP10, 441, 441, 442, 442, 442, 700, , 704
ESP10, 441, 441, 442, 442, 442, 703, , 707
ESP10, 441, 441, 442, 442, 442, 705, , 709
ESP10, 441, 441, 442, 442, 442, 707, , 711
ESP10, 441, 441, 442, 442, 442, 709, , 713
ESP10, 441, 441, 442, 442, 442, 711, , 715
ESP10, 441, 442, 442, 442, 442, 713, , 717
ESP10, 441, 441, 442, 442, 442, 715, , 719
ESP10, 441, 441, 442, 442, 442, 717, , 721
ESP10, 441, 442, 442, 442, 442, 719, , 723
ESP10, 441, 442, 442, 442, 442, 721, , 725
ESP10, 441, 441, 442, 442, 442, 723, , 727
ESP10, 441, 441, 442, 442, 442, 725, , 729
ESP10, 441, 441, 442, 442, 442, 728, , 732
ESP10, 441, 442, 442, 442, 442, 730, , 734
ESP10, 441, 442, 442, 442, 442, 732, , 736
ESP10, 441, 442, 442, 442, 442, 734, , 738
Max Scale
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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|2026-08-16
ARKI1N_SQIN.ESPF10.csv|2026-08-16
ARKI1N_SQIN.ESPFM.csv|2026-08-16
APR-SEP
BOISE - ARROWROCK DAM
(
ARKI1
)
Forecasts for Water Year
2027
Natural Forecast
ESP with 10 Days QPF
Ensemble:
2026-08-16
Issued:
2026-08-16
Hide Forecast
Forecast
Period
Forecasts Are in KAF
30 Year
Average
(1991-2020)
90 %
50 %
%
Average
10 %
APR-SEP
583
1058
87
2000
1212
APR-JUL
522
974
87
1858
1121
APR-AUG
554
1020
87
1939
1170
JAN-SEP
727
1237
84
2313
1479
JAN-JUL
673
1156
83
2163
1388
OCT-SEP
846
1385
85
2456
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|2026-08-16
ARKI1N_SQIN.ESPF10.csv|2026-08-16
ARKI1N_SQIN.ESPFM.csv|2026-08-16
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
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