Water Supply Forecast Listing

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Summary for Water Year (2026)

Ensemble Date: 2026-04-24 Issued Date: 2026-04-24

#	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	449	518	76	774	680
2	ABOM8	MSO	APR-SEP	CLARK FORK - ABOVE MISSOULA	1349	1497	95	1931	1571
3	ALFW1	OTX	APR-SEP	PEND OREILLE - ALBENI FALLS DAM	10426	11425	86	13433	13347
4	AMFI1	PIH	APR-SEP	SNAKE - AT AMERICAN FALLS DAM	581	738	28	1295	2624
5	ANTI1	PIH	APR-SEP	HENRYS FORK - AT ST. ANTHONY	353	421	53	534	794
6	ARAI1	BOI	APR-SEP	SF BOISE - ANDERSON RANCH DAM	182	206	42	260	495
7	ARDQ2	OTX	APR-SEP	COLUMBIA - ARROW LAKES (HUGH KEENLEYSIDE DAM)	26275	27907	116	29485	24059
8	BELM8	MSO	APR-SEP	CLARK FORK - BELOW MISSOULA	2379	2649	92	3285	2893
9	BEUO3	BOI	APR-SEP	NF MALHEUR - AT BEULAH	19.08	19.22	32	23.04	59.29
10	BFEI1	OTX	APR-SEP	KOOTENAI - AT BONNERS FERRY	8205	8936	106	10233	8463
11	BIRQ2	CAN	APR-SEP	COLUMBIA - AT BIRCHBANK	44732	47427	111	50047	42578
12	BITM8	MSO	APR-SEP	BITTERROOT - NEAR MISSOULA	1032	1162	90	1412	1289
13	BONM8	MSO	APR-SEP	BLACKFOOT - NEAR BONNER	882	968	109	1176	891
14	BONO3	PQR	APR-SEP	COLUMBIA - BONNEVILLE DAM	82574	86979	91	94420	95202
15	BRNI1	BOI	APR-SEP	SNAKE - BROWNLEE DAM	4704	4963	78	5438	6398
16	BUMW1	PDT	APR-SEP	BUMPING - BELOW BUMPING DAM	61.73	68.1	54	75.52	125
17	BUSO3	BOI	APR-SEP	SILVIES - NEAR BURNS	10.85	11.32	16	12.63	71.47
18	CABI1	OTX	APR-SEP	CLARK FORK - CABINET GORGE DAM	9536	10517	90	12348	11639
19	CASW1	PQR	APR-SEP	COWLITZ - AT CASTLE ROCK	1532	1792	72	2148	2504
20	CFMM8	MSO	APR-SEP	FLATHEAD - AT COLUMBIA FALLS	4348	4770	85	5536	5634
21	CHDW1	OTX	APR-SEP	CHELAN - LAKE CHELAN DAM	732	799	70	869	1139
22	CHEI1	PIH	APR-SEP	FALL RIVER - NEAR CHESTER	168	196	52	253	377
23	CIBW1	OTX	APR-SEP	COLUMBIA - AT INTL BOUNDARY	56591	59462	104	64037	56951
24	CLDI1	OTX	APR-SEP	ST JOE - AT CALDER	796	860	76	990	1138
25	CLEW1	PDT	APR-SEP	CLE ELUM - NEAR ROSLYN	162	179	43	202	419
26	COEI1	OTX	APR-SEP	COEUR D ALENE - COEUR D ALENE LAKE	1453	1591	64	1917	2504
27	CONW1	SEW	APR-SEP	SKAGIT - NEAR CONCRETE	4206	4506	76	5165	5955
28	CSCI1	BOI	APR-SEP	NF PAYETTE - CASCADE DAM	357	394	81	452	487
29	DARM8	MSO	APR-SEP	BITTERROOT - NEAR DARBY	397	456	88	566	519
30	DCDQ2	CAN	APR-SEP	DUNCAN - DUNCAN DAM	2445	2601	117	2763	2224
31	DONO3	BOI	APR-SEP	DONNER UND BLITZEN - NR FRENCHGLEN	19.12	22.08	35	30.14	62.51
32	DRBI1	BOI	APR-SEP	DEADWOOD - BELOW DEADWOOD RES	98.38	106	78	123	135
33	DRSW1	SEW	APR-SEP	DUNGENESS - NEAR SEQUIM	86.69	96.48	67	109	145
34	DWRI1	MSO	APR-SEP	NF CLEARWATER - DWORSHAK DAM	1984	2116	81	2434	2620
35	EASI1	OTX	APR-SEP	MOYIE - AT EASTPORT	277	307	78	399	395
36	EGCO3	BOI	APR-SEP	EAGLE CREEK - ABOVE SKULL CK	71.59	79.8	46	100	174
37	EMMI1	BOI	APR-SEP	PAYETTE - NEAR EMMETT	1030	1121	85	1315	1325
38	ENVI1	OTX	APR-SEP	NF COEUR D ALENE - AT ENAVILLE	354	390	52	536	743
39	ESTO3	PQR	APR-SEP	CLACKAMAS - AT ESTACADA	407	459	63	540	733
40	FCFM8	MSO	APR-SEP	NF FLATHEAD - NEAR COLUMBIA FALLS	1296	1421	81	1664	1750
41	GCDW1	OTX	APR-SEP	COLUMBIA - GRAND COULEE DAM	59293	62792	102	68247	61483
42	GIBO3	PDT	APR-SEP	UMATILLA - NEAR GIBBON	54.16	54.46	66	68.31	82.43
43	GREW4	RIW	APR-SEP	GREYS - AB RES NR ALPINE	221	245	66	288	371
44	HALI1	PIH	APR-SEP	BIG WOOD - AT HAILEY	186	212	82	257	257
45	HCDI1	PDT	APR-SEP	SNAKE - AT HELLS CANYON DAM	4736	4995	74	5469	6725
46	HEII1	PIH	APR-SEP	SNAKE - NEAR HEISE	2515	2753	72	3199	3849
47	HHWM8	MSO	APR-SEP	SF FLATHEAD - HUNGRY HORSE DAM	1541	1695	81	1971	2088
48	HLKW1	PDT	APR-SEP	YAKIMA - NEAR HORLICK	448	479	50	546	962
49	HOTI1	BOI	APR-SEP	BRUNEAU - NEAR HOT SPRINGS	16.36	19.57	11	43.9	183
50	HRSI1	BOI	APR-SEP	PAYETTE - NEAR HORSESHOE BEND	1129	1203	75	1402	1597
51	HWRI1	PIH	APR-SEP	BIG LOST - AT HOWELL RANCH NEAR CHILLY	114	144	84	207	172
52	IMNO3	PDT	APR-SEP	IMNAHA - AT IMNAHA	113	145	52	210	277
53	JDAO3	PDT	APR-SEP	COLUMBIA - JOHN DAY DAM	81696	86108	93	93481	92354
54	JLKW4	RIW	APR-SEP	SNAKE - JACKSON LAKE AT DAM	596	645	76	744	849
55	KACW1	PDT	APR-SEP	KACHESS - NEAR EASTON	45.92	51.36	45	61.94	114
56	KEEW1	PDT	APR-SEP	YAKIMA - NEAR MARTIN	60.21	68.65	53	84.63	129
57	KERM8	MSO	APR-SEP	FLATHEAD - SELI’Š KSANKA QLISPE’ DAM	4872	5433	83	6487	6577
58	KIOW1	PDT	APR-SEP	YAKIMA - AT KIONA	768	812	71	898	1149
59	LAUW1	OTX	APR-SEP	KETTLE - AT LAURIER	920	1189	61	1610	1954
60	LEOI1	OTX	APR-SEP	KOOTENAI - AT LEONIA	7697	8333	107	9520	7803
61	LGDW1	OTX	APR-SEP	SNAKE - LOWER GRANITE DAM	15559	16725	75	19464	22232
62	LGNO3	PDT	APR-SEP	GRANDE RONDE - NEAR PERRY	70.25	80.12	46	178	176
63	LLKW1	OTX	APR-SEP	SPOKANE - AT LONGLAKE	1784	1933	67	2293	2901
64	LSTO3	PDT	APR-SEP	LOSTINE - NR LOSTINE	50.55	63.16	54	84.06	116
65	LUCI1	BOI	APR-SEP	BOISE - LUCKY PEAK DAM	611	677	51	823	1329
66	LYDM8	MSO	APR-SEP	KOOTENAI - LIBBY DAM	6705	7239	113	8358	6429
67	MACI1	PIH	APR-SEP	BIG LOST - MACKAY RESERVOIR NEAR MACKAY	96.78	126	92	192	136
68	MADO3	BOI	APR-SEP	MALHEUR - NEAR DREWSEY	12.19	12.76	20	15.39	64.84
69	MAGI1	PIH	APR-SEP	BIG WOOD - MAGIC DAM	112	135	56	186	240
70	MCDQ2	CAN	APR-SEP	COLUMBIA - MICA DAM	13671	14397	117	15178	12296
71	MCDW1	PDT	APR-SEP	COLUMBIA - MCNARY DAM	80099	84511	91	91823	92790
72	MEHO3	PQR	APR-SEP	NORTH SANTIAM - AT MEHAMA	443	520	61	650	855
73	MEWW1	PQR	APR-SEP	LEWIS - MERWIN DAM	566	652	60	836	1082
74	MODO3	PDT	APR-SEP	DESCHUTES - AT MOODY NR BIGGS	1553	1555	82	1567	1902
75	MONO3	PDT	APR-SEP	NF JOHN DAY - AT MONUMENT	220	238	42	362	564
76	MYDW1	PQR	APR-SEP	COWLITZ - MAYFIELD RESERVOIR	1128	1316	71	1562	1864
77	NACW1	PDT	APR-SEP	NACHES - NEAR NACHES	490	526	65	577	807
78	NITW1	OTX	APR-SEP	SIMILKAMEEN - NEAR NIGHTHAWK	1048	1172	86	1390	1366
79	ORFI1	MSO	APR-SEP	CLEARWATER - AT OROFINO	3476	3798	82	4586	4632
80	OWYO3	BOI	APR-SEP	OWYHEE - OWYHEE DAM	35.68	41.72	12	99.92	336
81	PALI1	PIH	APR-SEP	SNAKE - NEAR IRWIN	2401	2630	74	3044	3577
82	PARI1	BOI	APR-SEP	BOISE - NEAR PARMA	434	455	78	504	584
83	PARW1	PDT	APR-SEP	YAKIMA - NEAR PARKER	1108	1172	62	1281	1899
84	PATW1	OTX	APR-SEP	METHOW - NEAR PATEROS	751	832	86	920	965
85	PDTO3	PDT	APR-SEP	UMATILLA - AT PENDLETON	108	111	70	155	158
86	PESW1	OTX	APR-SEP	WENATCHEE - AT PESHASTIN	939	996	67	1073	1496
87	PLNM8	MSO	APR-SEP	CLARK FORK - NEAR PLAINS	8432	9294	88	10947	10574
88	PRDW1	OTX	APR-SEP	COLUMBIA - BLO PRIEST RAPIDS DAM	63499	67095	98	72695	68162
89	PRTI1	OTX	APR-SEP	PRIEST - NEAR PRIEST RIVER	321	376	45	536	843
90	QBYQ2	CAN	APR-SEP	KOOTENAI - KOOTENAY L AT QUEENS BAY	15902	16955	107	18951	15842
91	REVQ2	CAN	APR-SEP	COLUMBIA - REVELSTOKE DAM	19196	20245	117	21444	17242
92	REXI1	PIH	APR-SEP	HENRYS FORK - AT REXBURG	702	796	47	997	1710
93	RIMW1	PDT	APR-SEP	TIETON - AT TIETON DAM	164	174	78	189	225
94	RIRI1	PIH	APR-SEP	WILLOW CREEK - NEAR RIRIE	11.5	12.5	21	21.64	60.33
95	RISW1	OTX	APR-SEP	COLUMBIA - BLO ROCK ISLAND DAM	63346	66942	99	72540	67524
96	RYGO3	MFR	APR-SEP	ROGUE - AT RAYGOLD	416	438	53	530	831
97	SALW4	RIW	APR-SEP	SALT - ABV PALISADES RES NR ETNA	167	195	53	243	368
98	SERO3	PDT	APR-SEP	JOHN DAY - AT SERVICE CK	281	301	38	439	798
99	SFLN2	PIH	APR-SEP	SALMON FALLS CREEK - NR SAN JACINTO	10.78	15.12	22	31.97	67.85
100	SHYI1	PIH	APR-SEP	SNAKE - NEAR SHELLEY	2810	3125	64	3737	4905
101	SKHI1	BOI	APR-SEP	SNAKE - AT KING HILL	2327	2488	73	2674	3412
102	SLCQ2	CAN	APR-SEP	SLOCAN - NEAR CRESCENT VALLEY	2013	2251	116	2472	1933
103	SLMO3	PQR	APR-SEP	WILLAMETTE - AT SALEM	2448	2856	60	3746	4754
104	SMKQ2	CAN	APR-SEP	SIMILKAMEEN - NEAR HEDLEY	809	899	90	1017	1004
105	SMNI1	MSO	APR-SEP	SALMON - AT SALMON	812	927	100	1187	929
106	SPDI1	OTX	APR-SEP	CLEARWATER - AT SPALDING	5646	6170	82	7262	7481
107	SPOW1	OTX	APR-SEP	SPOKANE - AT SPOKANE	1509	1657	64	2002	2587
108	SRGM8	MSO	APR-SEP	CLARK FORK - AT ST REGIS	3186	3459	92	4222	3771
109	STHW1	OTX	APR-SEP	STEHEKIN - AT STEHEKIN	572	605	74	659	814
110	SWAI1	BOI	APR-SEP	SNAKE - BELOW SWAN FALLS	2332	2484	76	2643	3258
111	TDAO3	PDT	APR-SEP	COLUMBIA - THE DALLES DAM	82000	86411	92	93792	94166
112	TEAI1	PIH	APR-SEP	TETON - NEAR ST. ANTHONY	241	282	63	363	447
113	TONW1	OTX	APR-SEP	OKANOGAN - NEAR TONASKET	1065	1202	70	1454	1720
114	TOPI1	PIH	APR-SEP	PORTNEUF - AT TOPAZ	35.94	38.03	53	43.11	72.20
115	TRYO3	PDT	APR-SEP	GRANDE RONDE - TROY	638	709	53	1114	1331
116	UNYO3	PDT	APR-SEP	BURNT - Unity Dam & Burnt RVR NR Hereford	4.01	4.71	15	6.15	31.00
117	VIDO3	PQR	APR-SEP	MCKENZIE - NEAR VIDA	742	798	67	862	1195
118	WDHN2	LKN	APR-SEP	OWYHEE - WILDHORSE DAM	1.44	1.88	12	9.14	15.92
119	WEII1	BOI	APR-SEP	SNAKE - AT WEISER	4417	4660	78	5090	5956
120	WGCM8	MSO	APR-SEP	MF FLATHEAD - NEAR WEST GLACIER	1422	1551	91	1839	1697
121	WHBI1	MSO	APR-SEP	SALMON - AT WHITEBIRD	4299	4673	76	5591	6158
122	WODI1	PIH	APR-SEP	LITTLE WOOD - NEAR CAREY	25.04	33.74	44	53.2	76.59
123	WSRI1	BOI	APR-SEP	WEISER - NEAR WEISER	241	261	67	315	389
124	WTLO3	PQR	APR-SEP	SOUTH SANTIAM - AT WATERLOO	293	364	62	500	590

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

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