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Archive:
Water Year
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SF FLATHEAD - HUNGRY HORSE DAM
(
HHWM8
)
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
1939
1939
93
1944
2088
APR-JUL
1853
1853
94
1853
1981
APR-AUG
1905
1905
93
1905
2043
JAN-SEP
2513
2514
107
2518
2343
JAN-JUL
2428
2428
109
2428
2236
OCT-SEP
3040
3041
118
3045
2567
Experimental Water Supply
HEFS with 15 days EQPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
1939
1939
93
1944
2088
APR-JUL
1853
1853
94
1853
1981
APR-AUG
1905
1905
93
1905
2043
JAN-SEP
2513
2514
107
2518
2343
JAN-JUL
2428
2428
109
2428
2236
OCT-SEP
3040
3041
118
3045
2567
Reference
ESP with 0 Days QPF
Ensemble:
2026-08-15
Issued:
2026-08-15
Hide Forecast
APR-SEP
1939
1940
93
1949
2088
APR-JUL
1853
1853
94
1853
1981
APR-AUG
1905
1905
93
1907
2043
JAN-SEP
2513
2514
107
2523
2343
JAN-JUL
2428
2428
109
2428
2236
OCT-SEP
3040
3041
118
3050
2567
Move the mouse over the desired "Forecast Period" to display a graph.
ESP10, 249, 296, 376, 419, 449, 70, , 74
ESP10, 249, 294, 375, 417, 448, 72, , 76
ESP10, 250, 292, 374, 415, 447, 74, , 78
ESP10, 251, 291, 374, 415, 447, 76, , 80
ESP10, 255, 291, 375, 415, 447, 78, , 82
ESP10, 253, 289, 369, 411, 444, 81, , 85
ESP10, 250, 286, 368, 408, 443, 83, , 87
ESP10, 255, 292, 374, 413, 451, 85, , 89
ESP10, 253, 292, 373, 410, 452, 87, , 91
ESP10, 251, 290, 370, 407, 450, 89, , 93
ESP10, 250, 287, 363, 402, 447, 91, , 95
ESP10, 260, 295, 371, 408, 454, 93, , 97
ESP10, 260, 296, 373, 408, 457, 95, , 99
ESP10, 259, 295, 373, 408, 457, 97, , 101
ESP10, 256, 295, 372, 406, 454, 99, , 103
ESP10, 249, 288, 370, 401, 449, 102, , 106
ESP10, 246, 285, 367, 398, 447, 104, , 108
ESP10, 244, 288, 369, 399, 446, 106, , 110
ESP10, 243, 286, 369, 399, 445, 108, , 112
ESP10, 245, 288, 373, 402, 447, 110, , 114
ESP10, 239, 281, 366, 398, 441, 112, , 116
ESP10, 248, 285, 372, 402, 445, 114, , 118
ESP10, 244, 280, 368, 399, 440, 116, , 120
ESP10, 252, 285, 373, 404, 445, 118, , 122
ESP10, 255, 288, 374, 408, 447, 120, , 124
ESP10, 247, 279, 366, 399, 440, 122, , 126
ESP10, 247, 280, 367, 399, 440, 125, , 129
ESP10, 255, 284, 372, 402, 446, 127, , 131
ESP10, 253, 282, 370, 400, 447, 129, , 133
ESP10, 243, 271, 359, 389, 438, 131, , 135
ESP10, 251, 275, 362, 393, 441, 133, , 137
ESP10, 259, 280, 364, 397, 442, 135, , 139
ESP10, 257, 283, 364, 398, 440, 137, , 141
ESP10, 259, 286, 366, 402, 441, 139, , 143
ESP10, 259, 288, 367, 403, 440, 141, , 145
ESP10, 262, 290, 369, 406, 444, 143, , 147
ESP10, 264, 289, 369, 406, 444, 145, , 149
ESP10, 260, 286, 367, 402, 441, 148, , 152
ESP10, 261, 288, 369, 403, 445, 150, , 154
ESP10, 261, 288, 370, 406, 446, 152, , 156
ESP10, 265, 292, 374, 411, 449, 154, , 158
ESP10, 266, 292, 373, 410, 449, 156, , 160
ESP10, 267, 298, 374, 412, 451, 158, , 162
ESP10, 270, 305, 377, 418, 455, 160, , 164
ESP10, 269, 302, 375, 414, 451, 162, , 166
ESP10, 268, 303, 381, 414, 449, 164, , 168
ESP10, 261, 296, 376, 407, 441, 166, , 170
ESP10, 274, 310, 388, 419, 456, 169, , 173
ESP10, 269, 305, 384, 415, 453, 171, , 175
ESP10, 268, 308, 384, 414, 452, 173, , 177
ESP10, 261, 302, 376, 407, 443, 175, , 179
ESP10, 263, 305, 377, 408, 450, 177, , 181
ESP10, 253, 294, 368, 399, 440, 179, , 183
ESP10, 264, 303, 376, 406, 449, 181, , 185
ESP10, 248, 292, 363, 395, 434, 183, , 187
ESP10, 249, 294, 364, 398, 442, 185, , 189
ESP10, 244, 292, 362, 395, 437, 187, , 191
ESP10, 245, 291, 363, 395, 436, 189, , 193
ESP10, 249, 296, 365, 400, 440, 192, , 196
ESP10, 234, 282, 353, 387, 426, 194, , 198
ESP10, 219, 273, 341, 375, 412, 196, , 200
ESP10, 223, 281, 345, 378, 415, 198, , 202
ESP10, 201, 260, 328, 362, 397, 200, , 204
ESP10, 180, 240, 312, 347, 380, 202, , 206
ESP10, 182, 242, 313, 349, 381, 204, , 208
ESP10, 181, 238, 308, 345, 378, 206, , 210
ESP10, 200, 256, 328, 359, 391, 208, , 212
ESP10, 184, 245, 316, 347, 378, 210, , 214
ESP10, 174, 230, 303, 340, 362, 212, , 216
ESP10, 178, 228, 303, 340, 364, 215, , 219
ESP10, 179, 231, 306, 342, 364, 217, , 221
ESP10, 174, 229, 303, 340, 361, 219, , 223
ESP10, 179, 236, 309, 346, 368, 221, , 225
ESP10, 181, 238, 311, 349, 372, 223, , 227
ESP10, 189, 245, 316, 357, 379, 225, , 229
ESP10, 190, 245, 316, 357, 379, 227, , 231
ESP10, 196, 252, 323, 363, 386, 229, , 233
ESP10, 199, 252, 324, 362, 386, 231, , 235
ESP10, 213, 260, 331, 368, 393, 233, , 237
ESP10, 218, 260, 334, 368, 391, 236, , 240
ESP10, 227, 267, 335, 368, 395, 238, , 242
ESP10, 231, 272, 338, 370, 396, 240, , 244
ESP10, 234, 276, 343, 374, 398, 242, , 246
ESP10, 232, 276, 340, 372, 396, 244, , 248
ESP10, 231, 272, 337, 368, 394, 246, , 250
ESP10, 229, 270, 337, 368, 392, 248, , 252
ESP10, 231, 275, 338, 370, 396, 250, , 254
ESP10, 240, 278, 339, 374, 403, 252, , 256
ESP10, 246, 278, 341, 377, 404, 254, , 258
ESP10, 248, 280, 340, 377, 403, 256, , 260
ESP10, 246, 281, 339, 376, 400, 259, , 263
ESP10, 237, 273, 332, 367, 390, 261, , 265
ESP10, 238, 273, 332, 366, 391, 263, , 267
ESP10, 242, 274, 334, 366, 395, 265, , 269
ESP10, 236, 269, 329, 361, 393, 267, , 271
ESP10, 233, 270, 326, 359, 389, 269, , 273
ESP10, 229, 271, 325, 356, 387, 271, , 275
ESP10, 232, 277, 326, 358, 386, 273, , 277
ESP10, 245, 283, 334, 369, 394, 275, , 279
ESP10, 250, 287, 336, 371, 395, 277, , 281
ESP10, 253, 292, 339, 376, 397, 279, , 283
ESP10, 254, 295, 342, 377, 396, 282, , 286
ESP10, 256, 298, 344, 380, 396, 284, , 288
ESP10, 258, 297, 341, 377, 394, 286, , 290
ESP10, 259, 301, 343, 378, 394, 288, , 292
ESP10, 258, 299, 344, 377, 391, 290, , 294
ESP10, 259, 298, 342, 375, 389, 292, , 296
ESP10, 262, 299, 342, 375, 389, 294, , 298
ESP10, 259, 296, 339, 372, 388, 296, , 300
ESP10, 276, 309, 352, 384, 404, 298, , 302
ESP10, 275, 308, 354, 387, 405, 300, , 304
ESP10, 278, 310, 357, 390, 408, 303, , 307
ESP10, 277, 309, 358, 389, 406, 305, , 309
ESP10, 283, 315, 363, 396, 411, 307, , 311
ESP10, 280, 316, 362, 396, 410, 309, , 313
ESP10, 281, 322, 363, 397, 410, 311, , 315
ESP10, 282, 325, 364, 398, 411, 313, , 317
ESP10, 279, 325, 358, 392, 409, 315, , 319
ESP10, 279, 329, 356, 390, 412, 317, , 321
ESP10, 281, 328, 356, 389, 412, 319, , 323
ESP10, 285, 328, 359, 391, 413, 321, , 325
ESP10, 284, 322, 358, 387, 408, 323, , 327
ESP10, 287, 324, 361, 389, 411, 326, , 330
ESP10, 290, 328, 362, 389, 412, 328, , 332
ESP10, 296, 334, 368, 396, 414, 330, , 334
ESP10, 297, 337, 366, 395, 412, 332, , 336
ESP10, 299, 338, 364, 394, 413, 334, , 338
ESP10, 299, 337, 363, 393, 411, 336, , 340
ESP10, 296, 332, 360, 391, 406, 338, , 342
ESP10, 302, 335, 363, 397, 412, 340, , 344
ESP10, 301, 334, 360, 397, 411, 342, , 346
ESP10, 305, 335, 360, 398, 415, 344, , 348
ESP10, 302, 333, 363, 396, 413, 346, , 350
ESP10, 303, 334, 366, 394, 414, 349, , 353
ESP10, 301, 329, 363, 390, 413, 351, , 355
ESP10, 296, 325, 361, 391, 413, 353, , 357
ESP10, 296, 324, 360, 391, 413, 355, , 359
ESP10, 301, 326, 362, 397, 416, 357, , 361
ESP10, 300, 321, 358, 393, 413, 359, , 363
ESP10, 305, 322, 359, 394, 417, 361, , 365
ESP10, 303, 319, 358, 392, 413, 363, , 367
ESP10, 306, 321, 361, 393, 412, 365, , 369
ESP10, 303, 323, 360, 388, 407, 367, , 371
ESP10, 303, 326, 359, 387, 406, 370, , 374
ESP10, 305, 330, 360, 389, 406, 372, , 376
ESP10, 310, 336, 366, 393, 410, 374, , 378
ESP10, 313, 343, 370, 397, 414, 376, , 380
ESP10, 311, 342, 368, 395, 413, 378, , 382
ESP10, 306, 340, 367, 391, 409, 380, , 384
ESP10, 294, 333, 358, 382, 398, 382, , 386
ESP10, 300, 341, 364, 391, 404, 384, , 388
ESP10, 298, 339, 361, 391, 401, 386, , 390
ESP10, 291, 331, 354, 383, 395, 388, , 392
ESP10, 283, 324, 348, 378, 385, 390, , 394
ESP10, 281, 321, 343, 374, 379, 393, , 397
ESP10, 277, 313, 337, 366, 371, 395, , 399
ESP10, 269, 305, 329, 355, 364, 397, , 401
ESP10, 276, 312, 334, 361, 371, 399, , 403
ESP10, 262, 295, 319, 345, 357, 401, , 405
ESP10, 276, 309, 334, 357, 369, 403, , 407
ESP10, 288, 317, 343, 365, 377, 405, , 409
ESP10, 287, 317, 342, 364, 376, 407, , 411
ESP10, 293, 325, 349, 372, 383, 409, , 413
ESP10, 292, 326, 348, 371, 385, 411, , 415
ESP10, 289, 324, 346, 370, 386, 413, , 417
ESP10, 283, 319, 339, 363, 380, 416, , 420
ESP10, 279, 315, 334, 360, 377, 418, , 422
ESP10, 283, 319, 338, 365, 382, 420, , 424
ESP10, 288, 320, 341, 367, 387, 422, , 426
ESP10, 290, 323, 344, 368, 391, 424, , 428
ESP10, 291, 323, 347, 367, 390, 426, , 430
ESP10, 291, 326, 350, 369, 395, 428, , 432
ESP10, 298, 330, 355, 372, 401, 430, , 434
ESP10, 290, 320, 348, 361, 394, 432, , 436
ESP10, 296, 321, 351, 362, 396, 434, , 438
ESP10, 301, 321, 351, 359, 395, 437, , 441
ESP10, 298, 317, 349, 357, 391, 439, , 443
ESP10, 301, 320, 354, 361, 394, 441, , 445
ESP10, 299, 319, 352, 360, 392, 443, , 447
ESP10, 294, 314, 347, 359, 386, 445, , 449
ESP10, 294, 312, 345, 360, 384, 447, , 451
ESP10, 298, 317, 348, 363, 389, 449, , 453
ESP10, 296, 315, 347, 362, 387, 451, , 455
ESP10, 301, 323, 353, 371, 392, 453, , 457
ESP10, 302, 329, 354, 371, 394, 455, , 459
ESP10, 299, 326, 349, 368, 391, 457, , 461
ESP10, 300, 325, 350, 367, 390, 460, , 464
ESP10, 297, 324, 348, 366, 388, 462, , 466
ESP10, 294, 321, 349, 364, 386, 464, , 468
ESP10, 297, 318, 342, 359, 379, 466, , 470
ESP10, 297, 317, 340, 357, 377, 468, , 472
ESP10, 299, 320, 344, 361, 379, 470, , 474
ESP10, 322, 342, 368, 385, 402, 472, , 476
ESP10, 320, 340, 367, 382, 401, 474, , 478
ESP10, 321, 338, 366, 382, 400, 476, , 480
ESP10, 323, 339, 368, 383, 399, 478, , 482
ESP10, 314, 331, 359, 376, 391, 480, , 484
ESP10, 322, 343, 366, 382, 398, 483, , 487
ESP10, 320, 343, 369, 381, 398, 485, , 489
ESP10, 325, 350, 372, 384, 402, 487, , 491
ESP10, 326, 348, 370, 383, 399, 489, , 493
ESP10, 327, 350, 370, 386, 401, 491, , 495
ESP10, 327, 350, 371, 386, 401, 493, , 497
ESP10, 336, 361, 383, 398, 411, 495, , 499
ESP10, 327, 352, 376, 390, 403, 497, , 501
ESP10, 326, 352, 374, 392, 404, 499, , 503
ESP10, 321, 347, 371, 386, 400, 501, , 505
ESP10, 319, 342, 366, 380, 394, 504, , 508
ESP10, 320, 341, 367, 381, 393, 506, , 510
ESP10, 321, 345, 369, 383, 394, 508, , 512
ESP10, 323, 349, 370, 386, 399, 510, , 514
ESP10, 325, 351, 375, 390, 403, 512, , 516
ESP10, 327, 354, 378, 393, 405, 514, , 518
ESP10, 327, 355, 377, 393, 407, 516, , 520
ESP10, 329, 355, 376, 392, 407, 518, , 522
ESP10, 326, 354, 374, 390, 404, 520, , 524
ESP10, 324, 354, 371, 388, 402, 522, , 526
ESP10, 323, 353, 369, 386, 399, 524, , 528
ESP10, 322, 348, 367, 384, 396, 527, , 531
ESP10, 323, 347, 370, 385, 397, 529, , 533
ESP10, 325, 347, 371, 384, 396, 531, , 535
ESP10, 325, 347, 372, 383, 396, 533, , 537
ESP10, 328, 345, 369, 378, 388, 535, , 539
ESP10, 335, 347, 372, 382, 391, 537, , 541
ESP10, 322, 333, 359, 372, 380, 539, , 543
ESP10, 325, 338, 365, 377, 384, 541, , 545
ESP10, 321, 335, 358, 371, 380, 543, , 547
ESP10, 319, 335, 356, 367, 380, 545, , 549
ESP10, 321, 336, 357, 366, 379, 547, , 551
ESP10, 321, 338, 357, 370, 379, 550, , 554
ESP10, 316, 334, 350, 364, 373, 552, , 556
ESP10, 315, 333, 350, 362, 371, 554, , 558
ESP10, 317, 333, 351, 361, 370, 556, , 560
ESP10, 307, 325, 343, 349, 358, 558, , 562
ESP10, 316, 329, 347, 355, 362, 560, , 564
ESP10, 317, 334, 349, 358, 362, 562, , 566
ESP10, 314, 330, 346, 354, 358, 564, , 568
ESP10, 336, 350, 366, 373, 379, 566, , 570
ESP10, 302, 318, 331, 343, 348, 568, , 572
ESP10, 298, 313, 326, 338, 344, 571, , 575
ESP10, 311, 326, 336, 348, 356, 573, , 577
ESP10, 311, 330, 342, 350, 358, 575, , 579
ESP10, 309, 327, 340, 349, 354, 577, , 581
ESP10, 305, 325, 336, 346, 350, 579, , 583
ESP10, 306, 325, 337, 346, 349, 581, , 585
ESP10, 294, 312, 322, 330, 334, 583, , 587
ESP10, 302, 319, 329, 337, 340, 585, , 589
ESP10, 305, 320, 330, 338, 342, 587, , 591
ESP10, 326, 341, 349, 357, 360, 589, , 593
ESP10, 325, 336, 346, 352, 356, 591, , 595
ESP10, 327, 336, 348, 352, 356, 594, , 598
ESP10, 334, 343, 351, 355, 356, 596, , 600
ESP10, 337, 347, 353, 356, 357, 598, , 602
ESP10, 335, 346, 353, 355, 357, 600, , 604
ESP10, 335, 346, 353, 355, 356, 602, , 606
ESP10, 338, 349, 354, 356, 358, 604, , 608
ESP10, 338, 349, 354, 356, 358, 606, , 610
ESP10, 339, 350, 354, 356, 357, 608, , 612
ESP10, 335, 349, 352, 354, 355, 610, , 614
ESP10, 341, 351, 354, 356, 357, 612, , 616
ESP10, 344, 350, 354, 355, 356, 614, , 618
ESP10, 346, 350, 353, 354, 354, 617, , 621
ESP10, 345, 350, 352, 353, 353, 619, , 623
ESP10, 341, 347, 348, 349, 350, 621, , 625
ESP10, 339, 345, 346, 347, 347, 623, , 627
ESP10, 341, 346, 347, 348, 348, 625, , 629
ESP10, 334, 339, 339, 340, 341, 627, , 631
ESP10, 330, 335, 335, 336, 337, 629, , 633
ESP10, 325, 329, 330, 331, 331, 631, , 635
ESP10, 315, 319, 320, 322, 322, 633, , 637
ESP10, 320, 324, 325, 326, 326, 635, , 639
ESP10, 334, 337, 338, 339, 339, 638, , 642
ESP10, 332, 335, 336, 337, 337, 640, , 644
ESP10, 329, 333, 334, 335, 335, 642, , 646
ESP10, 330, 332, 333, 334, 335, 644, , 648
ESP10, 327, 330, 331, 332, 332, 646, , 650
ESP10, 326, 329, 330, 331, 331, 648, , 652
ESP10, 326, 329, 330, 331, 331, 650, , 654
ESP10, 326, 329, 330, 331, 331, 652, , 656
ESP10, 326, 328, 330, 330, 331, 654, , 658
ESP10, 327, 328, 330, 330, 331, 656, , 660
ESP10, 327, 328, 329, 330, 331, 658, , 662
ESP10, 325, 328, 329, 329, 330, 661, , 665
ESP10, 326, 328, 329, 329, 330, 663, , 667
ESP10, 326, 328, 329, 329, 330, 665, , 669
ESP10, 326, 327, 329, 329, 330, 667, , 671
ESP10, 326, 328, 329, 329, 330, 669, , 673
ESP10, 326, 328, 329, 329, 330, 671, , 675
ESP10, 326, 328, 329, 329, 330, 673, , 677
ESP10, 326, 327, 329, 329, 330, 675, , 679
ESP10, 326, 327, 329, 329, 330, 677, , 681
ESP10, 326, 328, 329, 329, 330, 679, , 683
ESP10, 326, 328, 329, 329, 330, 681, , 685
ESP10, 326, 328, 329, 329, 330, 684, , 688
ESP10, 326, 328, 329, 330, 330, 686, , 690
ESP10, 326, 328, 329, 330, 330, 688, , 692
ESP10, 326, 328, 329, 330, 330, 690, , 694
ESP10, 326, 328, 329, 330, 330, 692, , 696
ESP10, 327, 328, 329, 330, 330, 694, , 698
ESP10, 327, 328, 329, 330, 330, 696, , 700
ESP10, 327, 328, 330, 330, 330, 698, , 702
ESP10, 327, 328, 330, 330, 330, 700, , 704
ESP10, 327, 328, 330, 330, 330, 702, , 706
ESP10, 327, 329, 330, 330, 331, 705, , 709
ESP10, 327, 329, 330, 330, 331, 707, , 711
ESP10, 328, 329, 330, 331, 331, 709, , 713
ESP10, 328, 329, 330, 331, 331, 711, , 715
ESP10, 328, 329, 330, 331, 331, 713, , 717
ESP10, 328, 329, 331, 331, 331, 715, , 719
ESP10, 331, 332, 333, 333, 333, 717, , 721
ESP10, 331, 332, 333, 333, 333, 719, , 723
ESP10, 331, 332, 333, 333, 333, 721, , 725
ESP10, 331, 332, 333, 333, 333, 723, , 727
ESP10, 330, 332, 333, 333, 333, 725, , 729
ESP10, 331, 332, 333, 333, 333, 728, , 732
ESP10, 332, 332, 333, 333, 333, 730, , 734
ESP10, 332, 332, 333, 333, 333, 732, , 736
ESP10, 332, 332, 332, 333, 333, 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/HHWM8W_SQIN.ESPF10.csv
HHWM8W_SQIN.ESPF0.csv|2026-08-15
HHWM8W_SQIN.ESPF10.csv|2026-08-15
HHWM8W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
SF FLATHEAD - HUNGRY HORSE DAM
(
HHWM8
)
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
1320
1804
86
2482
2088
APR-JUL
1234
1667
84
2359
1981
APR-AUG
1283
1733
85
2438
2043
JAN-SEP
1452
2060
88
2641
2343
JAN-JUL
1366
1877
84
2518
2236
OCT-SEP
1606
2200
86
2925
2567
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/HHWM8W_SQIN.ESPF10.csv
HHWM8W_SQIN.ESPF0.csv|2026-08-15
HHWM8W_SQIN.ESPF10.csv|2026-08-15
HHWM8W_SQIN.ESPFM.csv|2026-08-15
APR-SEP
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ESP10,ESPM,ESP0
ESP10,ESPM,ESP0
Last Forecast
