Water Supply Forecast Listing

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Click here for Next Water Year's forecast (2027)

Summary for Water Year (2026)

Ensemble Date: 2026-08-25 Issued Date: 2026-08-25

#	ID	Servicing WFO	Forecast Period	Name	90% Exceedence KAF	50% Exceedence KAF	% Normal	10% Exceedence KAF	30 Year Normal
1	ABBM8	MSO	APR-SEP	CLARK FORK - ABOVE BLACKFOOT	522	527	77	531	680
2	ABOM8	MSO	APR-SEP	CLARK FORK - ABOVE MISSOULA	1412	1416	90	1422	1571
3	ALFW1	OTX	APR-SEP	PEND OREILLE - ALBENI FALLS DAM	11340	11359	85	11408	13347
4	AMFI1	PIH	APR-SEP	SNAKE - AT AMERICAN FALLS DAM	635	645	25	673	2624
5	ANTI1	PIH	APR-SEP	HENRYS FORK - AT ST. ANTHONY	405	412	52	425	794
6	ARAI1	BOI	APR-SEP	SF BOISE - ANDERSON RANCH DAM	309	310	63	311	495
7	ARDQ2	OTX	APR-SEP	COLUMBIA - ARROW LAKES (HUGH KEENLEYSIDE DAM)	24199	24365	101	24589	24059
8	BELM8	MSO	APR-SEP	CLARK FORK - BELOW MISSOULA	2550	2557	88	2566	2893
9	BEUO3	BOI	APR-SEP	NF MALHEUR - AT BEULAH	16.89	16.89	28	16.89	59.29
10	BFEI1	OTX	APR-SEP	KOOTENAI - AT BONNERS FERRY	8283	8299	98	8404	8463
11	BIRQ2	CAN	APR-SEP	COLUMBIA - AT BIRCHBANK	41482	41681	98	42047	42578
12	BITM8	MSO	APR-SEP	BITTERROOT - NEAR MISSOULA	1191	1192	93	1196	1289
13	BONM8	MSO	APR-SEP	BLACKFOOT - NEAR BONNER	889	890	100	890	891
14	BONO3	PQR	APR-SEP	COLUMBIA - BONNEVILLE DAM	76153	76329	80	76843	95202
15	BRNI1	BOI	APR-SEP	SNAKE - BROWNLEE DAM	4220	4234	66	4319	6398
16	BUMW1	PDT	APR-SEP	BUMPING - BELOW BUMPING DAM	70.57	70.67	57	70.93	125
17	BUSO3	BOI	APR-SEP	SILVIES - NEAR BURNS	14.27	14.35	20	14.63	71.47
18	CABI1	OTX	APR-SEP	CLARK FORK - CABINET GORGE DAM	10232	10245	88	10262	11639
19	CASW1	PQR	APR-SEP	COWLITZ - AT CASTLE ROCK	1568	1580	63	1620	2504
20	CFMM8	MSO	APR-SEP	FLATHEAD - AT COLUMBIA FALLS	5230	5231	93	5240	5634
21	CHDW1	OTX	APR-SEP	CHELAN - LAKE CHELAN DAM	847	848	74	855	1139
22	CHEI1	PIH	APR-SEP	FALL RIVER - NEAR CHESTER	192	194	52	200	377
23	CIBW1	OTX	APR-SEP	COLUMBIA - AT INTL BOUNDARY	53509	53702	94	54168	56951
24	CLDI1	OTX	APR-SEP	ST JOE - AT CALDER	787	788	69	788	1138
25	CLEW1	PDT	APR-SEP	CLE ELUM - NEAR ROSLYN	186	186	44	192	419
26	COEI1	OTX	APR-SEP	COEUR D ALENE - COEUR D ALENE LAKE	1357	1357	54	1358	2504
27	CONW1	SEW	APR-SEP	SKAGIT - NEAR CONCRETE	3988	4016	67	4186	5955
28	CSCI1	BOI	APR-SEP	NF PAYETTE - CASCADE DAM	332	334	69	342	487
29	DARM8	MSO	APR-SEP	BITTERROOT - NEAR DARBY	474	476	92	477	519
30	DCDQ2	CAN	APR-SEP	DUNCAN - DUNCAN DAM	2344	2363	106	2382	2224
31	DONO3	BOI	APR-SEP	DONNER UND BLITZEN - NR FRENCHGLEN	25.7	25.74	41	25.86	62.51
32	DRBI1	BOI	APR-SEP	DEADWOOD - BELOW DEADWOOD RES	102	102	76	102	135
33	DRSW1	SEW	APR-SEP	DUNGENESS - NEAR SEQUIM	66.78	66.98	46	69	145
34	DWRI1	MSO	APR-SEP	NF CLEARWATER - DWORSHAK DAM	1928	1932	74	1936	2620
35	EASI1	OTX	APR-SEP	MOYIE - AT EASTPORT	310	310	79	311	395
36	EGCO3	BOI	APR-SEP	EAGLE CREEK - ABOVE SKULL CK	93.24	93.25	54	93.28	174
37	EMMI1	BOI	APR-SEP	PAYETTE - NEAR EMMETT	1215	1217	92	1221	1325
38	ENVI1	OTX	APR-SEP	NF COEUR D ALENE - AT ENAVILLE	371	372	50	372	743
39	ESTO3	PQR	APR-SEP	CLACKAMAS - AT ESTACADA	394	397	54	405	733
40	FCFM8	MSO	APR-SEP	NF FLATHEAD - NEAR COLUMBIA FALLS	1675	1675	96	1676	1750
41	GCDW1	OTX	APR-SEP	COLUMBIA - GRAND COULEE DAM	55649	55835	91	56305	61483
42	GIBO3	PDT	APR-SEP	UMATILLA - NEAR GIBBON	54.21	54.26	66	54.34	82.43
43	GREW4	RIW	APR-SEP	GREYS - AB RES NR ALPINE	230	231	62	232	371
44	HALI1	PIH	APR-SEP	BIG WOOD - AT HAILEY	176	177	69	177	257
45	HCDI1	PDT	APR-SEP	SNAKE - AT HELLS CANYON DAM	4322	4336	64	4421	6725
46	HEII1	PIH	APR-SEP	SNAKE - NEAR HEISE	2745	2752	71	2772	3849
47	HHWM8	MSO	APR-SEP	SF FLATHEAD - HUNGRY HORSE DAM	1944	1945	93	1952	2088
48	HLKW1	PDT	APR-SEP	YAKIMA - NEAR HORLICK	483	483	50	491	962
49	HOTI1	BOI	APR-SEP	BRUNEAU - NEAR HOT SPRINGS	32.92	33.2	18	34.09	183
50	HRSI1	BOI	APR-SEP	PAYETTE - NEAR HORSESHOE BEND	1193	1197	75	1208	1597
51	HWRI1	PIH	APR-SEP	BIG LOST - AT HOWELL RANCH NEAR CHILLY	142	142	83	143	172
52	IMNO3	PDT	APR-SEP	IMNAHA - AT IMNAHA	133	133	48	133	277
53	JDAO3	PDT	APR-SEP	COLUMBIA - JOHN DAY DAM	77095	77266	84	77771	92354
54	JLKW4	RIW	APR-SEP	SNAKE - JACKSON LAKE AT DAM	625	626	74	630	849
55	KACW1	PDT	APR-SEP	KACHESS - NEAR EASTON	51.84	52.04	46	53.64	114
56	KEEW1	PDT	APR-SEP	YAKIMA - NEAR MARTIN	79.35	79.73	62	83.73	129
57	KERM8	MSO	APR-SEP	FLATHEAD - SELI’Š KSANKA QLISPE’ DAM	6082	6084	93	6093	6577
58	KIOW1	PDT	APR-SEP	YAKIMA - AT KIONA	690	692	60	699	1149
59	LAUW1	OTX	APR-SEP	KETTLE - AT LAURIER	1026	1028	53	1039	1954
60	LEOI1	OTX	APR-SEP	KOOTENAI - AT LEONIA	7671	7687	99	7793	7803
61	LGDW1	OTX	APR-SEP	SNAKE - LOWER GRANITE DAM	15578	15602	70	15706	22232
62	LGNO3	PDT	APR-SEP	GRANDE RONDE - NEAR PERRY	51.13	51.28	29	51.68	176
63	LLKW1	OTX	APR-SEP	SPOKANE - AT LONGLAKE	1652	1653	57	1654	2901
64	LSTO3	PDT	APR-SEP	LOSTINE - NR LOSTINE	67.04	67.2	58	68.55	116
65	LUCI1	BOI	APR-SEP	BOISE - LUCKY PEAK DAM	809	810	61	813	1329
66	LYDM8	MSO	APR-SEP	KOOTENAI - LIBBY DAM	6755	6771	105	6869	6429
67	MACI1	PIH	APR-SEP	BIG LOST - MACKAY RESERVOIR NEAR MACKAY	100	101	74	101	136
68	MADO3	BOI	APR-SEP	MALHEUR - NEAR DREWSEY	12.68	12.69	20	12.85	64.84
69	MAGI1	PIH	APR-SEP	BIG WOOD - MAGIC DAM	92.21	92.71	39	94.21	240
70	MCDQ2	CAN	APR-SEP	COLUMBIA - MICA DAM	12897	13024	106	13122	12296
71	MCDW1	PDT	APR-SEP	COLUMBIA - MCNARY DAM	75377	75549	81	76051	92790
72	MEHO3	PQR	APR-SEP	NORTH SANTIAM - AT MEHAMA	427	430	50	444	855
73	MEWW1	PQR	APR-SEP	LEWIS - MERWIN DAM	603	606	56	631	1082
74	MODO3	PDT	APR-SEP	DESCHUTES - AT MOODY NR BIGGS	1431	1431	75	1432	1902
75	MONO3	PDT	APR-SEP	NF JOHN DAY - AT MONUMENT	210	210	37	211	564
76	MYDW1	PQR	APR-SEP	COWLITZ - MAYFIELD RESERVOIR	1099	1109	59	1134	1864
77	NACW1	PDT	APR-SEP	NACHES - NEAR NACHES	486	488	60	491	807
78	NITW1	OTX	APR-SEP	SIMILKAMEEN - NEAR NIGHTHAWK	979	981	72	987	1366
79	ORFI1	MSO	APR-SEP	CLEARWATER - AT OROFINO	3482	3485	75	3494	4632
80	OWYO3	BOI	APR-SEP	OWYHEE - OWYHEE DAM	75.31	76.43	23	79.04	336
81	PALI1	PIH	APR-SEP	SNAKE - NEAR IRWIN	2606	2613	73	2634	3577
82	PARI1	BOI	APR-SEP	BOISE - NEAR PARMA	385	386	66	387	584
83	PARW1	PDT	APR-SEP	YAKIMA - NEAR PARKER	952	954	50	967	1899
84	PATW1	OTX	APR-SEP	METHOW - NEAR PATEROS	825	826	86	826	965
85	PDTO3	PDT	APR-SEP	UMATILLA - AT PENDLETON	105	106	67	106	158
86	PESW1	OTX	APR-SEP	WENATCHEE - AT PESHASTIN	970	970	65	971	1496
87	PLNM8	MSO	APR-SEP	CLARK FORK - NEAR PLAINS	9839	9850	93	9866	10574
88	PRDW1	OTX	APR-SEP	COLUMBIA - BLO PRIEST RAPIDS DAM	60463	60654	89	61147	68162
89	PRTI1	OTX	APR-SEP	PRIEST - NEAR PRIEST RIVER	441	443	53	447	843
90	QBYQ2	CAN	APR-SEP	KOOTENAI - KOOTENAY L AT QUEENS BAY	15174	15197	96	15346	15842
91	REVQ2	CAN	APR-SEP	COLUMBIA - REVELSTOKE DAM	17995	18124	105	18302	17242
92	REXI1	PIH	APR-SEP	HENRYS FORK - AT REXBURG	863	870	51	883	1710
93	RIMW1	PDT	APR-SEP	TIETON - AT TIETON DAM	139	141	63	142	225
94	RIRI1	PIH	APR-SEP	WILLOW CREEK - NEAR RIRIE	8.68	9.02	15	9.42	60.33
95	RISW1	OTX	APR-SEP	COLUMBIA - BLO ROCK ISLAND DAM	59628	59819	89	60313	67524
96	RYGO3	MFR	APR-SEP	ROGUE - AT RAYGOLD	443	444	53	450	831
97	SALW4	RIW	APR-SEP	SALT - ABV PALISADES RES NR ETNA	164	165	45	168	368
98	SERO3	PDT	APR-SEP	JOHN DAY - AT SERVICE CK	274	274	34	276	798
99	SFLN2	PIH	APR-SEP	SALMON FALLS CREEK - NR SAN JACINTO	10.48	10.63	16	11.07	67.85
100	SHYI1	PIH	APR-SEP	SNAKE - NEAR SHELLEY	3105	3121	64	3158	4905
101	SKHI1	BOI	APR-SEP	SNAKE - AT KING HILL	2369	2380	70	2461	3412
102	SLCQ2	CAN	APR-SEP	SLOCAN - NEAR CRESCENT VALLEY	1743	1745	90	1794	1933
103	SLMO3	PQR	APR-SEP	WILLAMETTE - AT SALEM	2594	2614	55	2701	4754
104	SMKQ2	CAN	APR-SEP	SIMILKAMEEN - NEAR HEDLEY	702	704	70	710	1004
105	SMNI1	MSO	APR-SEP	SALMON - AT SALMON	740	742	80	746	929
106	SPDI1	OTX	APR-SEP	CLEARWATER - AT SPALDING	5496	5503	74	5517	7481
107	SPOW1	OTX	APR-SEP	SPOKANE - AT SPOKANE	1440	1441	56	1441	2587
108	SRGM8	MSO	APR-SEP	CLARK FORK - AT ST REGIS	3347	3354	89	3363	3771
109	STHW1	OTX	APR-SEP	STEHEKIN - AT STEHEKIN	601	601	74	606	814
110	SWAI1	BOI	APR-SEP	SNAKE - BELOW SWAN FALLS	1980	1990	61	2062	3258
111	TDAO3	PDT	APR-SEP	COLUMBIA - THE DALLES DAM	77483	77654	82	78159	94166
112	TEAI1	PIH	APR-SEP	TETON - NEAR ST. ANTHONY	279	280	63	284	447
113	TONW1	OTX	APR-SEP	OKANOGAN - NEAR TONASKET	1043	1046	61	1055	1720
114	TOPI1	PIH	APR-SEP	PORTNEUF - AT TOPAZ	42.7	43.19	60	43.94	72.20
115	TRYO3	PDT	APR-SEP	GRANDE RONDE - TROY	649	650	49	651	1331
116	UNYO3	PDT	APR-SEP	BURNT - Unity Dam & Burnt RVR NR Hereford	6.22	6.32	20	6.62	31.00
117	VIDO3	PQR	APR-SEP	MCKENZIE - NEAR VIDA	810	811	68	825	1195
118	WDHN2	LKN	APR-SEP	OWYHEE - WILDHORSE DAM	-4.15	-4.05	-25	-3.85	15.92
119	WEII1	BOI	APR-SEP	SNAKE - AT WEISER	4043	4058	68	4142	5956
120	WGCM8	MSO	APR-SEP	MF FLATHEAD - NEAR WEST GLACIER	1650	1650	97	1651	1697
121	WHBI1	MSO	APR-SEP	SALMON - AT WHITEBIRD	4843	4847	79	4853	6158
122	WODI1	PIH	APR-SEP	LITTLE WOOD - NEAR CAREY	39.46	39.66	52	40.26	76.59
123	WSRI1	BOI	APR-SEP	WEISER - NEAR WEISER	268	269	69	269	389
124	WTLO3	PQR	APR-SEP	SOUTH SANTIAM - AT WATERLOO	293	294	50	308	590

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