Water Supply Forecast Listing

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Summary for Water Year (2026)

Ensemble Date: 2026-09-03 Issued Date: 2026-09-03

#	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	530	532	78	535	680
2	ABOM8	MSO	APR-SEP	CLARK FORK - ABOVE MISSOULA	1425	1426	91	1430	1571
3	ALFW1	OTX	APR-SEP	PEND OREILLE - ALBENI FALLS DAM	11351	11368	85	11421	13347
4	AMFI1	PIH	APR-SEP	SNAKE - AT AMERICAN FALLS DAM	662	671	26	707	2624
5	ANTI1	PIH	APR-SEP	HENRYS FORK - AT ST. ANTHONY	440	446	56	453	794
6	ARAI1	BOI	APR-SEP	SF BOISE - ANDERSON RANCH DAM	309	309	63	310	495
7	ARDQ2	OTX	APR-SEP	COLUMBIA - ARROW LAKES (HUGH KEENLEYSIDE DAM)	24368	24478	102	24618	24059
8	BELM8	MSO	APR-SEP	CLARK FORK - BELOW MISSOULA	2562	2565	89	2573	2893
9	BEUO3	BOI	APR-SEP	NF MALHEUR - AT BEULAH	17.04	17.04	29	17.04	59.29
10	BFEI1	OTX	APR-SEP	KOOTENAI - AT BONNERS FERRY	8320	8333	98	8381	8463
11	BIRQ2	CAN	APR-SEP	COLUMBIA - AT BIRCHBANK	41770	41905	98	42096	42578
12	BITM8	MSO	APR-SEP	BITTERROOT - NEAR MISSOULA	1191	1192	92	1196	1289
13	BONM8	MSO	APR-SEP	BLACKFOOT - NEAR BONNER	894	894	100	895	891
14	BONO3	PQR	APR-SEP	COLUMBIA - BONNEVILLE DAM	76134	76291	80	76534	95202
15	BRNI1	BOI	APR-SEP	SNAKE - BROWNLEE DAM	4147	4156	65	4211	6398
16	BUMW1	PDT	APR-SEP	BUMPING - BELOW BUMPING DAM	70.68	70.68	57	71.32	125
17	BUSO3	BOI	APR-SEP	SILVIES - NEAR BURNS	14.42	14.46	20	14.62	71.47
18	CABI1	OTX	APR-SEP	CLARK FORK - CABINET GORGE DAM	10232	10243	88	10274	11639
19	CASW1	PQR	APR-SEP	COWLITZ - AT CASTLE ROCK	1523	1527	61	1560	2504
20	CFMM8	MSO	APR-SEP	FLATHEAD - AT COLUMBIA FALLS	5235	5239	93	5260	5634
21	CHDW1	OTX	APR-SEP	CHELAN - LAKE CHELAN DAM	846	847	74	856	1139
22	CHEI1	PIH	APR-SEP	FALL RIVER - NEAR CHESTER	202	203	54	206	377
23	CIBW1	OTX	APR-SEP	COLUMBIA - AT INTL BOUNDARY	53794	53929	95	54128	56951
24	CLDI1	OTX	APR-SEP	ST JOE - AT CALDER	788	788	69	788	1138
25	CLEW1	PDT	APR-SEP	CLE ELUM - NEAR ROSLYN	191	191	45	194	419
26	COEI1	OTX	APR-SEP	COEUR D ALENE - COEUR D ALENE LAKE	1350	1350	54	1350	2504
27	CONW1	SEW	APR-SEP	SKAGIT - NEAR CONCRETE	3978	3996	67	4147	5955
28	CSCI1	BOI	APR-SEP	NF PAYETTE - CASCADE DAM	334	336	69	342	487
29	DARM8	MSO	APR-SEP	BITTERROOT - NEAR DARBY	477	478	92	479	519
30	DCDQ2	CAN	APR-SEP	DUNCAN - DUNCAN DAM	2342	2357	106	2368	2224
31	DONO3	BOI	APR-SEP	DONNER UND BLITZEN - NR FRENCHGLEN	25.92	25.93	41	26.16	62.51
32	DRBI1	BOI	APR-SEP	DEADWOOD - BELOW DEADWOOD RES	102	102	76	102	135
33	DRSW1	SEW	APR-SEP	DUNGENESS - NEAR SEQUIM	67.16	67.33	46	69.46	145
34	DWRI1	MSO	APR-SEP	NF CLEARWATER - DWORSHAK DAM	1929	1931	74	1936	2620
35	EASI1	OTX	APR-SEP	MOYIE - AT EASTPORT	309	309	78	310	395
36	EGCO3	BOI	APR-SEP	EAGLE CREEK - ABOVE SKULL CK	93.03	93.04	53	93.05	174
37	EMMI1	BOI	APR-SEP	PAYETTE - NEAR EMMETT	1175	1176	89	1179	1325
38	ENVI1	OTX	APR-SEP	NF COEUR D ALENE - AT ENAVILLE	372	372	50	372	743
39	ESTO3	PQR	APR-SEP	CLACKAMAS - AT ESTACADA	398	401	55	408	733
40	FCFM8	MSO	APR-SEP	NF FLATHEAD - NEAR COLUMBIA FALLS	1675	1675	96	1677	1750
41	GCDW1	OTX	APR-SEP	COLUMBIA - GRAND COULEE DAM	55845	55981	91	56180	61483
42	GIBO3	PDT	APR-SEP	UMATILLA - NEAR GIBBON	54.17	54.2	66	54.26	82.43
43	GREW4	RIW	APR-SEP	GREYS - AB RES NR ALPINE	231	231	62	233	371
44	HALI1	PIH	APR-SEP	BIG WOOD - AT HAILEY	176	176	69	177	257
45	HCDI1	PDT	APR-SEP	SNAKE - AT HELLS CANYON DAM	4259	4268	63	4323	6725
46	HEII1	PIH	APR-SEP	SNAKE - NEAR HEISE	2759	2763	72	2788	3849
47	HHWM8	MSO	APR-SEP	SF FLATHEAD - HUNGRY HORSE DAM	1949	1951	93	1958	2088
48	HLKW1	PDT	APR-SEP	YAKIMA - NEAR HORLICK	482	482	50	492	962
49	HOTI1	BOI	APR-SEP	BRUNEAU - NEAR HOT SPRINGS	33.33	33.51	18	34.17	183
50	HRSI1	BOI	APR-SEP	PAYETTE - NEAR HORSESHOE BEND	1198	1202	75	1209	1597
51	HWRI1	PIH	APR-SEP	BIG LOST - AT HOWELL RANCH NEAR CHILLY	143	143	83	143	172
52	IMNO3	PDT	APR-SEP	IMNAHA - AT IMNAHA	132	132	48	132	277
53	JDAO3	PDT	APR-SEP	COLUMBIA - JOHN DAY DAM	77181	77340	84	77579	92354
54	JLKW4	RIW	APR-SEP	SNAKE - JACKSON LAKE AT DAM	626	627	74	631	849
55	KACW1	PDT	APR-SEP	KACHESS - NEAR EASTON	52.49	52.59	46	53.87	114
56	KEEW1	PDT	APR-SEP	YAKIMA - NEAR MARTIN	79.23	79.43	62	82.89	129
57	KERM8	MSO	APR-SEP	FLATHEAD - SELI’Š KSANKA QLISPE’ DAM	6092	6098	93	6122	6577
58	KIOW1	PDT	APR-SEP	YAKIMA - AT KIONA	695	696	61	699	1149
59	LAUW1	OTX	APR-SEP	KETTLE - AT LAURIER	1029	1031	53	1042	1954
60	LEOI1	OTX	APR-SEP	KOOTENAI - AT LEONIA	7706	7719	99	7766	7803
61	LGDW1	OTX	APR-SEP	SNAKE - LOWER GRANITE DAM	15508	15526	70	15588	22232
62	LGNO3	PDT	APR-SEP	GRANDE RONDE - NEAR PERRY	52.01	52.17	30	52.51	176
63	LLKW1	OTX	APR-SEP	SPOKANE - AT LONGLAKE	1643	1644	57	1645	2901
64	LSTO3	PDT	APR-SEP	LOSTINE - NR LOSTINE	68.1	68.22	59	69.32	116
65	LUCI1	BOI	APR-SEP	BOISE - LUCKY PEAK DAM	809	810	61	812	1329
66	LYDM8	MSO	APR-SEP	KOOTENAI - LIBBY DAM	6789	6802	106	6847	6429
67	MACI1	PIH	APR-SEP	BIG LOST - MACKAY RESERVOIR NEAR MACKAY	102	102	75	103	136
68	MADO3	BOI	APR-SEP	MALHEUR - NEAR DREWSEY	12.7	12.71	20	12.92	64.84
69	MAGI1	PIH	APR-SEP	BIG WOOD - MAGIC DAM	92.54	93.04	39	94.08	240
70	MCDQ2	CAN	APR-SEP	COLUMBIA - MICA DAM	13032	13115	107	13215	12296
71	MCDW1	PDT	APR-SEP	COLUMBIA - MCNARY DAM	75470	75627	82	75870	92790
72	MEHO3	PQR	APR-SEP	NORTH SANTIAM - AT MEHAMA	437	440	51	454	855
73	MEWW1	PQR	APR-SEP	LEWIS - MERWIN DAM	616	618	57	641	1082
74	MODO3	PDT	APR-SEP	DESCHUTES - AT MOODY NR BIGGS	1421	1421	75	1421	1902
75	MONO3	PDT	APR-SEP	NF JOHN DAY - AT MONUMENT	210	210	37	210	564
76	MYDW1	PQR	APR-SEP	COWLITZ - MAYFIELD RESERVOIR	1043	1046	56	1064	1864
77	NACW1	PDT	APR-SEP	NACHES - NEAR NACHES	488	489	61	492	807
78	NITW1	OTX	APR-SEP	SIMILKAMEEN - NEAR NIGHTHAWK	978	979	72	983	1366
79	ORFI1	MSO	APR-SEP	CLEARWATER - AT OROFINO	3499	3501	76	3514	4632
80	OWYO3	BOI	APR-SEP	OWYHEE - OWYHEE DAM	76.44	77.12	23	78.95	336
81	PALI1	PIH	APR-SEP	SNAKE - NEAR IRWIN	2619	2623	73	2648	3577
82	PARI1	BOI	APR-SEP	BOISE - NEAR PARMA	392	392	67	394	584
83	PARW1	PDT	APR-SEP	YAKIMA - NEAR PARKER	938	940	49	954	1899
84	PATW1	OTX	APR-SEP	METHOW - NEAR PATEROS	823	823	85	824	965
85	PDTO3	PDT	APR-SEP	UMATILLA - AT PENDLETON	106	106	67	106	158
86	PESW1	OTX	APR-SEP	WENATCHEE - AT PESHASTIN	968	968	65	969	1496
87	PLNM8	MSO	APR-SEP	CLARK FORK - NEAR PLAINS	9854	9864	93	9895	10574
88	PRDW1	OTX	APR-SEP	COLUMBIA - BLO PRIEST RAPIDS DAM	60646	60783	89	60989	68162
89	PRTI1	OTX	APR-SEP	PRIEST - NEAR PRIEST RIVER	440	441	52	444	843
90	QBYQ2	CAN	APR-SEP	KOOTENAI - KOOTENAY L AT QUEENS BAY	15187	15207	96	15304	15842
91	REVQ2	CAN	APR-SEP	COLUMBIA - REVELSTOKE DAM	18151	18222	106	18347	17242
92	REXI1	PIH	APR-SEP	HENRYS FORK - AT REXBURG	872	876	51	887	1710
93	RIMW1	PDT	APR-SEP	TIETON - AT TIETON DAM	139	140	62	141	225
94	RIRI1	PIH	APR-SEP	WILLOW CREEK - NEAR RIRIE	9.07	9.27	15	9.67	60.33
95	RISW1	OTX	APR-SEP	COLUMBIA - BLO ROCK ISLAND DAM	59815	59952	89	60159	67524
96	RYGO3	MFR	APR-SEP	ROGUE - AT RAYGOLD	450	452	54	459	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	275	34	276	798
99	SFLN2	PIH	APR-SEP	SALMON FALLS CREEK - NR SAN JACINTO	10.7	10.85	16	11.04	67.85
100	SHYI1	PIH	APR-SEP	SNAKE - NEAR SHELLEY	3160	3170	65	3204	4905
101	SKHI1	BOI	APR-SEP	SNAKE - AT KING HILL	2381	2388	70	2446	3412
102	SLCQ2	CAN	APR-SEP	SLOCAN - NEAR CRESCENT VALLEY	1750	1763	91	1809	1933
103	SLMO3	PQR	APR-SEP	WILLAMETTE - AT SALEM	2621	2640	56	2729	4754
104	SMKQ2	CAN	APR-SEP	SIMILKAMEEN - NEAR HEDLEY	702	703	70	707	1004
105	SMNI1	MSO	APR-SEP	SALMON - AT SALMON	746	747	80	750	929
106	SPDI1	OTX	APR-SEP	CLEARWATER - AT SPALDING	5521	5526	74	5546	7481
107	SPOW1	OTX	APR-SEP	SPOKANE - AT SPOKANE	1431	1432	55	1432	2587
108	SRGM8	MSO	APR-SEP	CLARK FORK - AT ST REGIS	3354	3357	89	3366	3771
109	STHW1	OTX	APR-SEP	STEHEKIN - AT STEHEKIN	599	599	74	605	814
110	SWAI1	BOI	APR-SEP	SNAKE - BELOW SWAN FALLS	1949	1955	60	2005	3258
111	TDAO3	PDT	APR-SEP	COLUMBIA - THE DALLES DAM	77578	77736	83	77975	94166
112	TEAI1	PIH	APR-SEP	TETON - NEAR ST. ANTHONY	280	281	63	286	447
113	TONW1	OTX	APR-SEP	OKANOGAN - NEAR TONASKET	1043	1045	61	1054	1720
114	TOPI1	PIH	APR-SEP	PORTNEUF - AT TOPAZ	42.87	43.15	60	43.9	72.20
115	TRYO3	PDT	APR-SEP	GRANDE RONDE - TROY	651	651	49	652	1331
116	UNYO3	PDT	APR-SEP	BURNT - Unity Dam & Burnt RVR NR Hereford	6.1	6.2	20	6.44	31.00
117	VIDO3	PQR	APR-SEP	MCKENZIE - NEAR VIDA	811	814	68	825	1195
118	WDHN2	LKN	APR-SEP	OWYHEE - WILDHORSE DAM	-4.37	-4.37	-27	-4.23	15.92
119	WEII1	BOI	APR-SEP	SNAKE - AT WEISER	3984	3992	67	4049	5956
120	WGCM8	MSO	APR-SEP	MF FLATHEAD - NEAR WEST GLACIER	1650	1651	97	1660	1697
121	WHBI1	MSO	APR-SEP	SALMON - AT WHITEBIRD	4844	4846	79	4854	6158
122	WODI1	PIH	APR-SEP	LITTLE WOOD - NEAR CAREY	41.07	41.27	54	41.65	76.59
123	WSRI1	BOI	APR-SEP	WEISER - NEAR WEISER	270	270	69	271	389
124	WTLO3	PQR	APR-SEP	SOUTH SANTIAM - AT WATERLOO	294	296	50	311	590

Link to main Northwest River Forecast Center (NWRFC) web site

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