Water Supply Forecast Listing

Header for Water Supply Period Rankings Page

Summary for Water Year (2027)

Ensemble Date: 2026-10-21 Issued Date: 2026-10-21

#	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	417	709	104	1230	680
2	ABOM8	MSO	APR-SEP	CLARK FORK - ABOVE MISSOULA	946	1435	91	2562	1571
3	ALFW1	OTX	APR-SEP	PEND OREILLE - ALBENI FALLS DAM	8305	11714	88	16648	13347
4	AMFI1	PIH	APR-SEP	SNAKE - AT AMERICAN FALLS DAM	1454	2606	99	5269	2624
5	ANTI1	PIH	APR-SEP	HENRYS FORK - AT ST. ANTHONY	387	671	85	1141	794
6	ARAI1	BOI	APR-SEP	SF BOISE - ANDERSON RANCH DAM	193	394	80	722	495
7	ARDQ2	OTX	APR-SEP	COLUMBIA - ARROW LAKES (HUGH KEENLEYSIDE DAM)	17202	21455	89	26258	24059
8	BELM8	MSO	APR-SEP	CLARK FORK - BELOW MISSOULA	1735	2573	89	4390	2893
9	BEUO3	BOI	APR-SEP	NF MALHEUR - AT BEULAH	17.63	44.33	75	105	59.29
10	BFEI1	OTX	APR-SEP	KOOTENAI - AT BONNERS FERRY	5348	6890	81	9884	8463
11	BIRQ2	CAN	APR-SEP	COLUMBIA - AT BIRCHBANK	27738	36238	85	46324	42578
12	BITM8	MSO	APR-SEP	BITTERROOT - NEAR MISSOULA	812	1171	91	1829	1289
13	BONM8	MSO	APR-SEP	BLACKFOOT - NEAR BONNER	522	742	83	1307	891
14	BONO3	PQR	APR-SEP	COLUMBIA - BONNEVILLE DAM	66758	84813	89	110072	95202
15	BRNI1	BOI	APR-SEP	SNAKE - BROWNLEE DAM	4113	5817	91	10254	6398
16	BUMW1	PDT	APR-SEP	BUMPING - BELOW BUMPING DAM	70.69	107	86	159	125
17	BUSO3	BOI	APR-SEP	SILVIES - NEAR BURNS	10.38	33.74	47	144	71.47
18	CABI1	OTX	APR-SEP	CLARK FORK - CABINET GORGE DAM	7746	10688	92	15457	11639
19	CASW1	PQR	APR-SEP	COWLITZ - AT CASTLE ROCK	1705	2357	94	3133	2504
20	CFMM8	MSO	APR-SEP	FLATHEAD - AT COLUMBIA FALLS	3793	5333	95	7280	5634
21	CHDW1	OTX	APR-SEP	CHELAN - LAKE CHELAN DAM	615	952	84	1494	1139
22	CHEI1	PIH	APR-SEP	FALL RIVER - NEAR CHESTER	204	332	88	559	377
23	CIBW1	OTX	APR-SEP	COLUMBIA - AT INTL BOUNDARY	39674	50066	88	64874	56951
24	CLDI1	OTX	APR-SEP	ST JOE - AT CALDER	641	951	84	1624	1138
25	CLEW1	PDT	APR-SEP	CLE ELUM - NEAR ROSLYN	271	388	93	539	419
26	COEI1	OTX	APR-SEP	COEUR D ALENE - COEUR D ALENE LAKE	1397	2072	83	3444	2504
27	CONW1	SEW	APR-SEP	SKAGIT - NEAR CONCRETE	4081	5532	93	7273	5955
28	CSCI1	BOI	APR-SEP	NF PAYETTE - CASCADE DAM	247	429	88	688	487
29	DARM8	MSO	APR-SEP	BITTERROOT - NEAR DARBY	266	478	92	862	519
30	DCDQ2	CAN	APR-SEP	DUNCAN - DUNCAN DAM	1673	2034	91	2500	2224
31	DONO3	BOI	APR-SEP	DONNER UND BLITZEN - NR FRENCHGLEN	20.92	45	72	105	62.51
32	DRBI1	BOI	APR-SEP	DEADWOOD - BELOW DEADWOOD RES	63.19	109	80	191	135
33	DRSW1	SEW	APR-SEP	DUNGENESS - NEAR SEQUIM	100	140	96	187	145
34	DWRI1	MSO	APR-SEP	NF CLEARWATER - DWORSHAK DAM	1519	2160	82	3100	2620
35	EASI1	OTX	APR-SEP	MOYIE - AT EASTPORT	176	315	80	548	395
36	EGCO3	BOI	APR-SEP	EAGLE CREEK - ABOVE SKULL CK	97	138	80	209	174
37	EMMI1	BOI	APR-SEP	PAYETTE - NEAR EMMETT	628	1049	79	2122	1325
38	ENVI1	OTX	APR-SEP	NF COEUR D ALENE - AT ENAVILLE	401	633	85	975	743
39	ESTO3	PQR	APR-SEP	CLACKAMAS - AT ESTACADA	484	684	93	946	733
40	FCFM8	MSO	APR-SEP	NF FLATHEAD - NEAR COLUMBIA FALLS	1049	1590	91	2297	1750
41	GCDW1	OTX	APR-SEP	COLUMBIA - GRAND COULEE DAM	43676	54344	88	70697	61483
42	GIBO3	PDT	APR-SEP	UMATILLA - NEAR GIBBON	45.14	71.3	86	114	82.43
43	GREW4	RIW	APR-SEP	GREYS - AB RES NR ALPINE	243	342	92	490	371
44	HALI1	PIH	APR-SEP	BIG WOOD - AT HAILEY	115	198	77	417	257
45	HCDI1	PDT	APR-SEP	SNAKE - AT HELLS CANYON DAM	4113	5817	86	10254	6725
46	HEII1	PIH	APR-SEP	SNAKE - NEAR HEISE	2513	3583	93	5751	3849
47	HHWM8	MSO	APR-SEP	SF FLATHEAD - HUNGRY HORSE DAM	1348	1750	84	2469	2088
48	HLKW1	PDT	APR-SEP	YAKIMA - NEAR HORLICK	666	914	95	1243	962
49	HOTI1	BOI	APR-SEP	BRUNEAU - NEAR HOT SPRINGS	53.68	141	77	262	183
50	HRSI1	BOI	APR-SEP	PAYETTE - NEAR HORSESHOE BEND	766	1329	83	2320	1597
51	HWRI1	PIH	APR-SEP	BIG LOST - AT HOWELL RANCH NEAR CHILLY	83.01	143	83	311	172
52	IMNO3	PDT	APR-SEP	IMNAHA - AT IMNAHA	127	221	80	340	277
53	JDAO3	PDT	APR-SEP	COLUMBIA - JOHN DAY DAM	65517	83373	90	108069	92354
54	JLKW4	RIW	APR-SEP	SNAKE - JACKSON LAKE AT DAM	496	701	83	1054	849
55	KACW1	PDT	APR-SEP	KACHESS - NEAR EASTON	71.44	103	90	143	114
56	KEEW1	PDT	APR-SEP	YAKIMA - NEAR MARTIN	86.75	117	91	159	129
57	KERM8	MSO	APR-SEP	FLATHEAD - SELI’Š KSANKA QLISPE’ DAM	4079	5903	90	8353	6577
58	KIOW1	PDT	APR-SEP	YAKIMA - AT KIONA	457	793	69	1389	1149
59	LAUW1	OTX	APR-SEP	KETTLE - AT LAURIER	626	1506	77	2414	1954
60	LEOI1	OTX	APR-SEP	KOOTENAI - AT LEONIA	4903	6392	82	9068	7803
61	LGDW1	OTX	APR-SEP	SNAKE - LOWER GRANITE DAM	12488	18254	82	28956	22232
62	LGNO3	PDT	APR-SEP	GRANDE RONDE - NEAR PERRY	73.76	153	87	327	176
63	LLKW1	OTX	APR-SEP	SPOKANE - AT LONGLAKE	1704	2487	86	3976	2901
64	LSTO3	PDT	APR-SEP	LOSTINE - NR LOSTINE	66.65	104	90	139	116
65	LUCI1	BOI	APR-SEP	BOISE - LUCKY PEAK DAM	566	1143	86	2070	1329
66	LYDM8	MSO	APR-SEP	KOOTENAI - LIBBY DAM	3927	5240	81	7304	6429
67	MACI1	PIH	APR-SEP	BIG LOST - MACKAY RESERVOIR NEAR MACKAY	78.29	136	100	293	136
68	MADO3	BOI	APR-SEP	MALHEUR - NEAR DREWSEY	13.45	37.22	57	122	64.84
69	MAGI1	PIH	APR-SEP	BIG WOOD - MAGIC DAM	62.16	154	64	463	240
70	MCDQ2	CAN	APR-SEP	COLUMBIA - MICA DAM	8483	10489	85	13215	12296
71	MCDW1	PDT	APR-SEP	COLUMBIA - MCNARY DAM	64042	81066	87	105797	92790
72	MEHO3	PQR	APR-SEP	NORTH SANTIAM - AT MEHAMA	524	743	87	1047	855
73	MEWW1	PQR	APR-SEP	LEWIS - MERWIN DAM	688	1040	96	1318	1082
74	MODO3	PDT	APR-SEP	DESCHUTES - AT MOODY NR BIGGS	1715	1800	95	1905	1902
75	MONO3	PDT	APR-SEP	NF JOHN DAY - AT MONUMENT	249	484	86	902	564
76	MYDW1	PQR	APR-SEP	COWLITZ - MAYFIELD RESERVOIR	1286	1787	96	2406	1864
77	NACW1	PDT	APR-SEP	NACHES - NEAR NACHES	466	690	85	956	807
78	NITW1	OTX	APR-SEP	SIMILKAMEEN - NEAR NIGHTHAWK	467	878	64	1589	1366
79	ORFI1	MSO	APR-SEP	CLEARWATER - AT OROFINO	2723	4073	88	5995	4632
80	OWYO3	BOI	APR-SEP	OWYHEE - OWYHEE DAM	109	251	75	675	336
81	PALI1	PIH	APR-SEP	SNAKE - NEAR IRWIN	2320	3305	92	5383	3577
82	PARI1	BOI	APR-SEP	BOISE - NEAR PARMA	278	432	74	1065	584
83	PARW1	PDT	APR-SEP	YAKIMA - NEAR PARKER	1486	1939	102	2459	1899
84	PATW1	OTX	APR-SEP	METHOW - NEAR PATEROS	406	661	68	1170	965
85	PDTO3	PDT	APR-SEP	UMATILLA - AT PENDLETON	78.01	129	82	247	158
86	PESW1	OTX	APR-SEP	WENATCHEE - AT PESHASTIN	858	1353	90	1889	1496
87	PLNM8	MSO	APR-SEP	CLARK FORK - NEAR PLAINS	6878	9411	89	13561	10574
88	PRDW1	OTX	APR-SEP	COLUMBIA - BLO PRIEST RAPIDS DAM	47276	58538	86	77931	68162
89	PRTI1	OTX	APR-SEP	PRIEST - NEAR PRIEST RIVER	363	690	82	857	843
90	QBYQ2	CAN	APR-SEP	KOOTENAI - KOOTENAY L AT QUEENS BAY	9138	13344	84	18540	15842
91	REVQ2	CAN	APR-SEP	COLUMBIA - REVELSTOKE DAM	12022	14992	87	18558	17242
92	REXI1	PIH	APR-SEP	HENRYS FORK - AT REXBURG	858	1297	76	2060	1710
93	RIMW1	PDT	APR-SEP	TIETON - AT TIETON DAM	146	197	88	254	225
94	RIRI1	PIH	APR-SEP	WILLOW CREEK - NEAR RIRIE	8.59	43.52	72	140	60.33
95	RISW1	OTX	APR-SEP	COLUMBIA - BLO ROCK ISLAND DAM	47275	58537	87	77930	67524
96	RYGO3	MFR	APR-SEP	ROGUE - AT RAYGOLD	428	785	94	1181	831
97	SALW4	RIW	APR-SEP	SALT - ABV PALISADES RES NR ETNA	203	342	93	532	368
98	SERO3	PDT	APR-SEP	JOHN DAY - AT SERVICE CK	317	611	77	1288	798
99	SFLN2	PIH	APR-SEP	SALMON FALLS CREEK - NR SAN JACINTO	19.9	53.02	78	116	67.85
100	SHYI1	PIH	APR-SEP	SNAKE - NEAR SHELLEY	2988	4316	88	7157	4905
101	SKHI1	BOI	APR-SEP	SNAKE - AT KING HILL	2175	2586	76	5185	3412
102	SLCQ2	CAN	APR-SEP	SLOCAN - NEAR CRESCENT VALLEY	1144	1715	89	2361	1933
103	SLMO3	PQR	APR-SEP	WILLAMETTE - AT SALEM	2734	4226	89	6132	4754
104	SMKQ2	CAN	APR-SEP	SIMILKAMEEN - NEAR HEDLEY	416	761	76	1202	1004
105	SMNI1	MSO	APR-SEP	SALMON - AT SALMON	577	918	99	1531	929
106	SPDI1	OTX	APR-SEP	CLEARWATER - AT SPALDING	4431	6390	85	9139	7481
107	SPOW1	OTX	APR-SEP	SPOKANE - AT SPOKANE	1453	2158	83	3595	2587
108	SRGM8	MSO	APR-SEP	CLARK FORK - AT ST REGIS	2194	3338	89	5319	3771
109	STHW1	OTX	APR-SEP	STEHEKIN - AT STEHEKIN	471	708	87	990	814
110	SWAI1	BOI	APR-SEP	SNAKE - BELOW SWAN FALLS	2432	2900	89	5430	3258
111	TDAO3	PDT	APR-SEP	COLUMBIA - THE DALLES DAM	65966	83867	89	108645	94166
112	TEAI1	PIH	APR-SEP	TETON - NEAR ST. ANTHONY	278	460	103	668	447
113	TONW1	OTX	APR-SEP	OKANOGAN - NEAR TONASKET	628	1186	69	1976	1720
114	TOPI1	PIH	APR-SEP	PORTNEUF - AT TOPAZ	31.72	56.02	78	95.1	72.20
115	TRYO3	PDT	APR-SEP	GRANDE RONDE - TROY	649	1228	92	1921	1331
116	UNYO3	PDT	APR-SEP	BURNT - Unity Dam & Burnt RVR NR Hereford	5.74	21.56	70	56.2	31.00
117	VIDO3	PQR	APR-SEP	MCKENZIE - NEAR VIDA	815	1141	96	1576	1195
118	WDHN2	LKN	APR-SEP	OWYHEE - WILDHORSE DAM	2.13	13.63	86	45.23	15.92
119	WEII1	BOI	APR-SEP	SNAKE - AT WEISER	3817	5391	91	9554	5956
120	WGCM8	MSO	APR-SEP	MF FLATHEAD - NEAR WEST GLACIER	1316	1796	106	2384	1697
121	WHBI1	MSO	APR-SEP	SALMON - AT WHITEBIRD	2991	5048	82	7559	6158
122	WODI1	PIH	APR-SEP	LITTLE WOOD - NEAR CAREY	23.15	50	65	164	76.59
123	WSRI1	BOI	APR-SEP	WEISER - NEAR WEISER	188	331	85	526	389
124	WTLO3	PQR	APR-SEP	SOUTH SANTIAM - AT WATERLOO	347	599	102	828	590

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

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