Columbia River Basin SNOTEL Snow/Precipitation Update Report

Columbia River Basin SNOTEL Snow/Precipitation Update Report

Based on Mountain Data from NRCS SNOTEL Sites

**Provisional data, subject to revision**

Data based on the first reading of the day (typically 00:00) for Wednesday, April 16, 2025

Basin Site Name	Elev (ft)	Snow Water Equivalent			Water Year-to-Date Precipitation
Basin Site Name	Elev (ft)	Current (in)	Median (in)	Pct of Median	Current (in)	Median (in)	Pct of Median
KOOTENAI RIVER IN MONTANA
Banfield Mountain	5580	15.3	17.2	89	23.1	26.8	86
Bear Mountain	5460	58.6	56.2₍₂₉₎	104	61.4	75.0	82
Garver Creek	4250	8.4	7.9	106	15.5	18.8₍₂₄₎	82
Grave Creek	4350	13.5	12.4	109	29.5	32.8	90
Hand Creek	5040	8.6	9.0	96	16.5	18.2	91
Hawkins Lake	6460	23.3	26.6	88	31.6	32.3	98
Poorman Creek	5050	32.2	35.4₍₂₂₎	91	46.6	58.7₍₂₂₎	79
Stahl Peak	6040	36.0	38.5	94	38.2	41.6	92
Basin Index (%)		96			86
FLATHEAD RIVER BASIN
Ashley Divide	4820	-M	N/A	*	10.0	N/A	*
Badger Pass	6870	25.0	32.1₍₂₉₎	78	25.3	35.2₍₂₉₎	72
Bisson Creek	4880	8.9	9.1₍₂₉₎	98	20.1	18.0₍₂₈₎	112
Blacktail Mtn	5660	7.9	12.3₍₁₀₎	64	13.9	14.8₍₁₀₎	94
Emery Creek	4340	10.0	12.5	80	23.9	26.9	89
Flattop Mtn.	6290	36.9	45.7	81	42.4	54.6	78
Grave Creek	4350	13.5	12.4	109	29.5	32.8	90
Hand Creek	5040	8.6	9.0	96	16.5	18.2	91
Kraft Creek	4760	5.1	8.7	59	27.0	27.8	97
Many Glacier	4930	4.2	10.4	40	23.3	31.0	75
Moss Peak	6760	41.5	39.4	105	43.4	40.0	108
Noisy Basin	6070	51.2	43.4	118	47.6	48.2	99
North Fork Jocko	6110	46.1	42.0	110	44.8	51.6	87
Pike Creek	5930	0.3	N/A	*	26.5	N/A	*
Sleeping Woman	6120	11.6	14.8₍₂₉₎	78	19.4	24.0₍₂₈₎	81
Stahl Peak	6040	36.0	38.5	94	38.2	41.6	92
Stuart Mountain	7270	32.2	34.0₍₂₆₎	95	30.2	33.4₍₂₆₎	90
Basin Index (%)		93			89
UPPER CLARK FORK RIVER BASIN
Barker Lakes	8250	14.4	15.1	95	16.6	16.8	99
Basin Creek	7120	9.4	8.4	112	10.0	10.6	94
Black Pine	7170	9.0	10.4	87	13.5	14.2	95
Combination	5620	0.2	2.6	8	8.2	10.0	82
Copper Bottom	5200	0.0	4.6	0	14.6	16.2	90
Copper Camp	6980	24.6	39.9₍₁₇₎	62	25.3	28.5₍₁₇₎	89
Lubrecht Flume	4690	0.0	0.0	*	9.0	11.4	79
Nevada Ridge	7030	13.7	15.6₍₂₆₎	88	15.0	17.0₍₂₆₎	88
N Fk Elk Creek	6180	10.1	10.6	95	12.8	15.0	85
North Fork Jocko	6110	46.1	42.0	110	44.8	51.6	87
Peterson Meadows	7190	10.8	11.0	98	13.6	14.1₍₂₂₎	96
Rocker Peak	7960	14.2	14.5	98	14.4	14.2	101
Skalkaho Summit	7260	18.5	23.1	80	19.9	23.4	85
Stuart Mountain	7270	32.2	34.0₍₂₆₎	95	30.2	33.4₍₂₆₎	90
Warm Springs	7840	25.4	22.5	113	24.9	24.1	103
Basin Index (%)		90			91
BITTERROOT
Daly Creek	5780	0.0	8.4	0	13.0	14.2	92
Lolo Pass	5280	23.0	27.2	85	32.5	36.0	90
Moose Creek	6170	10.1	14.2	71	17.0	20.6	83
Nez Perce Camp	5670	12.9	12.0	108	20.1	21.8	92
Saddle Mtn.	7890	21.2	24.2	88	18.9	22.8	83
Skalkaho Summit	7260	18.5	23.1	80	19.9	23.4	85
Twelvemile Creek	5530	15.7	12.0	131	33.6	35.8	94
Twin Lakes	6390	38.9	39.2	99	47.2	49.8	95
Basin Index (%)		88			90
LOWER CLARK FORK RIVER BASIN
Hoodoo Basin	6060	37.3	40.2	93	43.9	48.2	91
Humboldt Gulch	4260	9.7	7.1₍₂₉₎	137	29.1	40.4	72
Lolo Pass	5280	23.0	27.2	85	32.5	36.0	90
Lookout	5180	18.8	25.2	75	30.1	39.9	75
Poorman Creek	5050	32.2	35.4₍₂₂₎	91	46.6	58.7₍₂₂₎	79
Sleeping Woman	6120	11.6	14.8₍₂₉₎	78	19.4	24.0₍₂₈₎	81
Stuart Mountain	7270	32.2	34.0₍₂₆₎	95	30.2	33.4₍₂₆₎	90
Sunset	5580	13.9	21.7	64	23.2	36.6	63
Basin Index (%)		87			80
IDAHO PANHANDLE REGION
Bear Mountain	5460	58.6	56.2₍₂₉₎	104	61.4	75.0	82
Bunchgrass Mdw	5020	26.8	28.0	96	34.5	37.6	92
Humboldt Gulch	4260	9.7	7.1₍₂₉₎	137	29.1	40.4	72
Lookout	5180	18.8	25.2	75	30.1	39.9	75
Lost Lake	6090	49.0	53.4	92	55.2	61.8	89
Mica Creek	4480	16.6	18.5	90	36.5	40.5	90
Mosquito Ridge	5270	30.4	33.7₍₂₉₎	90	37.9	47.0	81
Quartz Peak	4710	16.8	17.9	94	38.7	35.2	110
Schweitzer Basin	6090	57.7	49.6	116	44.4	42.2	105
Sherwin	3190	0.0	1.1₍₂₉₎	0	26.4	30.4₍₂₉₎	87
Sunset	5580	13.9	21.7	64	23.2	36.6	63
Basin Index (%)		95			86
COLUMBIA ABOVE METHOW
Bunchgrass Mdw	5020	26.8	28.0	96	34.5	37.6	92
Harts Pass	6490	37.1	46.6	80	31.6	41.2	77
Moses Mtn	5470	17.5	14.6₍₂₉₎	120	22.5	18.4₍₂₉₎	122
Salmon Meadows	4460	3.8	6.5	58	15.1	13.7	110
Basin Index (%)		89			94
CHELAN, ENTIAT, WENATCHEE
Blewett Pass	4240	0.6	7.7	8	24.7	28.5	87
Lyman Lake	5990	42.7	61.3	70	56.4	66.4	85
Park Creek Ridge	4610	30.4	44.6	68	49.4	58.7	84
Pope Ridge	3600	8.1	12.0	68	25.3	28.4	89
Stevens Pass	3940	29.8	35.1	85	60.7	77.0	79
Trough	5480	9.8	8.7	113	22.8	21.3	107
Upper Wheeler	4330	6.9	10.1	68	20.3	20.6	99
Basin Index (%)		71			86
YAKIMA, AHTANUM
Bumping Ridge	4600	24.1	26.0	93	50.6	52.7	96
Fish Lake	3430	13.4	26.0	52	41.5	53.8	77
Green Lake	5930	26.6	24.0	111	31.8	30.7	104
Grouse Camp	5390	11.3	15.7	72	24.9	27.2	92
Lost Horse	5100	9.8	15.2	64	20.3	26.4	77
Morse Lake	5400	59.3	55.0	108	70.3	71.6	98
Sasse Ridge	4340	24.1	30.4	79	41.2	50.2	82
White Pass E.S.	4440	24.5	21.2	116	40.6	38.8	105
Basin Index (%)		90			91
SNAKE ABOVE PALISADES
Base Camp	7040	14.7	15.2	97	20.9	21.1	99
Blind Bull Sum	8880	26.4	24.9	106	18.7	18.2	103
Cottonwood Creek	7710	21.7	20.4	106	28.5	26.2	109
East Rim Divide	8010	6.0	9.7	62	11.6	11.6	100
Granite Creek	6770	14.9	13.0	115	18.3	19.2	95
Grassy Lake	7330	28.9	32.4	89	35.2	36.6	96
Gros Ventre Summit	8760	11.5	13.0	88	13.3	13.0	102
Lewis Lake Divide	7880	30.9	32.3	96	35.7	34.4	104
Loomis Park	8240	12.0	14.6	82	16.9	17.2	98
Phillips Bench	8160	24.3	26.4	92	27.1	27.3	99
Salt River Summit	7630	11.9	11.5	103	14.0	16.7	84
Spring Creek Divide	9020	27.5	25.2	109	25.6	24.4	105
Togwotee Pass	9590	23.5	24.6	96	25.8	25.6	101
Two Ocean Plateau	9240	30.2	31.9	95	25.3	28.1	90
Willow Creek	8060	32.0	28.4	113	36.4	34.5	106
Basin Index (%)		98			100
HENRYS FORK, TETON, WILLOW, BLACKFOOT, PORTNEUF
Black Bear	8160	33.9	39.4	86	35.5	38.2	93
Crab Creek	6870	7.5	11.0	68	12.8	15.6	82
Grassy Lake	7330	28.9	32.4	89	35.2	36.6	96
Island Park	6300	8.3	11.6	72	16.9	18.0	94
Lewis Lake Divide	7880	30.9	32.3	96	35.7	34.4	104
Madison Plateau	7710	22.8	23.2	98	25.8	25.4	102
Phillips Bench	8160	24.3	26.4	92	27.1	27.3	99
Pine Creek Pass	6710	13.1	12.6	104	21.9	22.8	96
Sedgwick Peak	7800	18.0	17.6	102	22.3	21.3	105
Sheep Mtn.	6630	9.3	8.2	113	15.8	16.7	95
Slug Creek Divide	7240	12.1	12.2	99	22.2	22.0	101
Somsen Ranch	6830	8.2	9.1	90	16.8	17.3	97
Whiskey Creek	6790	15.2	15.5	98	21.4	20.8	103
White Elephant	7670	23.7	28.1	84	27.4	29.0	94
Wildhorse Divide	6480	17.8	12.9	138	23.9	20.6	116
Basin Index (%)		94			99
BIG AND LITTLE WOOD BASINS
Camas Creek Divide	5720	8.8	3.6₍₂₈₎	244	19.9	18.2₍₂₈₎	109
Chocolate Gulch	6310	8.4	9.4₍₂₇₎	89	14.3	15.1₍₂₇₎	95
Dollarhide Summit	8390	24.8	23.8	104	19.4	26.0	75
Galena	7470	14.8	15.3	97	17.8	18.3	97
Galena Summit	8780	20.5	20.1	102	21.3	20.8	102
Garfield R.S.	6580	0.0	3.4	0	10.5	12.4	85
Hyndman	7590	8.0	9.1	88	13.3	15.6	85
Lost-Wood Divide	7870	17.2	17.2	100	18.5	20.2	92
Swede Peak	7640	7.6	12.1	63	14.0	16.8	83
Vienna Mine	8930	32.0	33.5	96	30.4	32.4	94
Basin Index (%)		96			92
BIG AND LITTLE LOST BASINS
Bear Canyon	7920	11.3	13.1	86	16.1	17.0	95
Hilts Creek	8090	8.4	11.2	75	10.5	12.8	82
Lost-Wood Divide	7870	17.2	17.2	100	18.5	20.2	92
Meadow Lake	9190	13.4	15.8	85	15.0	18.0	83
Moonshine	7490	7.2	8.0	90	11.2	13.3	84
Stickney Mill	7440	2.5	5.0	50	9.2	11.1	83
Basin Index (%)		85			87
RAFT, GOOSE, SALMON FALLS, BRUNEAU
Bear Creek	8090	15.8	17.2	92	21.9	22.1	99
Big Bend	6890	1.7	0.9	189*	13.0	10.6	123
Bostetter R.S.	7530	14.0	12.2	115	20.7	18.9	110
Howell Canyon	8010	23.2	24.2	96	29.0	28.4	102
Magic Mountain	6940	20.3	15.4	132	22.5	22.6	100
Pole Creek R.S.	8360	21.8	20.0	109	13.1	12.0	109
Seventysix Creek	7360	6.3	4.8	131	15.8	14.2	111
Wilson Creek	7110	5.1	8.6	59	18.5	17.5	106
Basin Index (%)		105			106
WEISER, PAYETTE, BOISE
Atlanta Summit	7570	35.9	28.6	126	33.6	33.0	102
Banner Summit	7040	27.9	25.4	110	33.1	32.1	103
Bear Basin	5350	21.3	15.6	137	28.6	25.2	113
Bear Saddle	6170	29.3	17.2	170	31.2	26.6	117
Big Creek Summit	6560	36.0	31.2	115	36.1	36.8	98
Brundage Reservoir	6280	37.5	28.5	132	42.1	39.2	107
Cozy Cove	5410	-M	8.6	*	24.1	23.3	103
Deadwood Summit	6990	53.4	41.8	128	47.0	44.0	107
Dollarhide Summit	8390	24.8	23.8	104	19.4	26.0	75
Graham Guard Sta.	5680	9.2	7.0	131	25.3	22.8	111
Jackson Peak	7060	32.1	26.6	121	36.9	33.4	110
Mores Creek Summit	6090	33.2	27.2	122	39.9	36.6	109
Prairie	4800	0.1	0.0	*	18.7	15.8	118
Secesh Summit	6520	41.2	28.7	144	41.0	30.7	134
Puhi Flat	6240	34.7	18.6	187	37.5	32.8	114
Trinity Mtn.	7790	39.2	35.8	109	40.2	38.6	104
Vienna Mine	8930	32.0	33.5	96	30.4	32.4	94
West Branch	5590	21.9	17.4	126	38.6	30.8	125
Basin Index (%)		125			108
OWYHEE MALHEUR
Big Bend	6890	1.7	0.9	189*	13.0	10.6	123
Blue Mountain Spring	5880	17.8	11.8	151	31.8	24.9	128
Fawn Creek	7040	12.5	14.6	86	21.7	22.1	98
Jack Creek Upper	7380	15.4	15.3	101	19.9	18.6	107
Jacks Peak	8440	-M	N/A	*	24.2	24.0	101
Lake Creek R.S.	5250	3.8	1.2	317	25.6	17.8	144
Laurel Draw	6680	3.1	3.7	84	21.0	17.4	121
Mud Flat	5750	0.0	0.0	*	11.6	11.2	104
South Mtn.	6650	9.7	8.9	109	30.6	23.8	129
Taylor Canyon	6320	0.0	0.0	*	8.0	8.4	95
Basin Index (%)		113			116
GRAND RONDE, POWDER, BURNT, IMNAHA
Aneroid Lake #2	7430	21.8	24.6	89	32.7	31.8	103
Beaver Reservoir	5140	7.4	4.8	154	22.2	21.2	105
Bourne	5850	13.1	10.6	124	29.6	23.0	129
County Line	4840	1.3	0.0	*	17.2	14.6	118
Eilertson Meadows	5510	8.9	1.4	636	26.7	21.5	124
Gold Center	5400	8.0	0.0	*	26.5	18.8	141
Moss Springs	5760	-M	23.3	*	-M	36.8	*
Mt. Howard	7840	15.5	17.6	88	31.1	29.4	106
Schneider Meadows	5400	41.0	22.2	185	47.9	38.6	124
Taylor Green	5730	24.3	16.5	147	33.7	28.9	117
Wolf Creek	5730	8.6	12.6	68	23.3	21.2	110
Basin Index (%)		136			117
CLEARWATER AND SALMON
Banner Summit	7040	27.9	25.4	110	33.1	32.1	103
Beagle Springs	8880	8.8	10.1	87	9.2	10.6	87
Bear Basin	5350	21.3	15.6	137	28.6	25.2	113
Big Creek Summit	6560	36.0	31.2	115	36.1	36.8	98
Brundage Reservoir	6280	37.5	28.5	132	42.1	39.2	107
Cool Creek	6310	45.4	45.2	100	48.1	55.4	87
Crater Meadows	5960	45.3	46.8	97	50.6	55.5	91
Darkhorse Lake	8930	28.1	30.4	92	27.5	28.2	98
Deadwood Summit	6990	53.4	41.8	128	47.0	44.0	107
Elk Butte	5680	29.3	34.2	86	37.6	44.2	85
Galena	7470	14.8	15.3	97	17.8	18.3	97
Galena Summit	8780	20.5	20.1	102	21.3	20.8	102
Hemlock Butte	5800	48.1	45.0	107	35.8	N/A	*
Hoodoo Basin	6060	37.3	40.2	93	43.9	48.2	91
Lemhi Ridge	8080	9.0	11.0	82	12.4	13.4	93
Lolo Pass	5280	23.0	27.2	85	32.5	36.0	90
Lost Lake	6090	49.0	53.4	92	55.2	61.8	89
Meadow Lake	9190	13.4	15.8	85	15.0	18.0	83
Mill Creek Summit	8790	20.5	20.2₍₂₉₎	101	19.6	19.4	101
Moonshine	7490	7.2	8.0	90	11.2	13.3	84
Moose Creek	6170	10.1	14.2	71	17.0	20.6	83
Morgan Creek	7620	9.7	8.2	118	14.0	15.4	91
Mountain Meadows	6340	23.2	21.6	107	30.9	30.4	102
Nez Perce Camp	5670	12.9	12.0	108	20.1	21.8	92
Saddle Mtn.	7890	21.2	24.2	88	18.9	22.8	83
Savage Pass	6170	22.4	26.2	85	28.8	33.4	86
Secesh Summit	6520	41.2	28.7	144	41.0	30.7	134
Shanghi Summit	4590	15.6	19.6	80	38.6	43.0	90
Sherwin	3190	0.0	1.1₍₂₉₎	0	26.4	30.4₍₂₉₎	87
Puhi Flat	6240	34.7	18.6	187	37.5	32.8	114
Twelvemile Creek	5530	15.7	12.0	131	33.6	35.8	94
Twin Lakes	6390	38.9	39.2	99	47.2	49.8	95
Vienna Mine	8930	32.0	33.5	96	30.4	32.4	94
West Branch	5590	21.9	17.4	126	38.6	30.8	125
Basin Index (%)		104			96
UMATILLA, WALLA WALLA, WILLOW
Arbuckle Mtn	5770	19.3	13.2	146	32.5	26.6	122
Bowman Springs	4540	1.2	0.2	600*	21.3	18.8	113
Emigrant Springs	3780	0.0	0.0	*	24.6	25.2	98
High Ridge	4900	27.8	19.6	142	40.8	40.4	101
Touchet	5520	30.7	27.8	110	42.3	45.9	92
Basin Index (%)		130			103
DESCHUTES, CROOKED, JOHN DAY
Arbuckle Mtn	5770	19.3	13.2	146	32.5	26.6	122
Blue Mountain Spring	5880	17.8	11.8	151	31.8	24.9	128
Cascade Summit	5100	38.4	27.8	138	63.3	53.2	119
Chemult Alternate	4850	3.5	0.0	*	28.4	21.6	131
Derr.	5850	12.5	7.1	176	28.3	21.0	135
Hogg Pass	4800	-M	19.2₍₁₇₎	*	-M	56.5₍₁₇₎	*
Irish Taylor	5540	43.4	33.7	129	-M	54.1	*
Lucky Strike	4970	1.6	0.2	800*	26.6	18.2	146
New Crescent Lake	4910	14.1	0.3	4700*	46.9	32.3	145
Ochoco Meadows	5430	5.0	1.0	500	27.7	18.8	147
Starr Ridge	5240	0.0	0.0	*	19.9	14.6	136
Three Creeks Meadow	5680	10.9	15.2	72	40.4	33.6	120
Tipton	5150	13.8	8.8	157	23.2	16.4	141
Basin Index (%)		151			131
LOWER COLUMBIA, HOOD RIVER
Madison Butte	5150	0.0	0.0	*	13.9	12.6	110
Blazed Alder	3660	17.4	27.2	64	90.8	100.8	90
Clear Lake	3810	3.2	6.6	48	32.2	33.1	97
Greenpoint	3320	10.1	11.6	87	61.1	60.8	100
North Fork	3070	7.3	19.2	38	116.4	125.7	93
Red Hill	4410	42.2	43.7	97	84.8	93.0	91
Basin Index (%)		74			94
WILLAMETTE
Summit Lake	5610	50.1	39.6	127	69.9	58.5	119
Irish Taylor	5540	43.4	33.7	129	-M	54.1	*
Cascade Summit	5100	38.4	27.8	138	63.3	53.2	119
Roaring River	4960	28.4	24.4	116	65.2	55.3	118
Holland Meadows	4930	22.5	15.4	146	67.1	61.8	109
Mckenzie	4770	37.5	35.2	107	80.4	78.0	103
Hogg Pass	4800	-M	19.2₍₁₇₎	*	-M	56.5₍₁₇₎	*
Salt Creek Falls	4220	15.3	15.8	97	67.9	60.4	112
Mud Ridge	4070	18.0	21.3₍₂₉₎	85	54.9	57.2	96
Little Meadows	4020	27.4	23.5	117	98.0	94.0	104
Clear Lake	3810	3.2	6.6	48	32.2	33.1	97
Santiam Jct.	3740	0.0	0.8	0*	66.6	61.2	109
Daly Lake	3690	0.1	5.6	2	69.4	65.4	106
Jump Off Joe	3530	0.0	4.6	0	72.8	66.9	109
Peavine Ridge	3420	0.2	5.2	4	57.1	50.8	112
Clackamas Lake	3400	3.3	4.8	69	43.2	45.6	95
Saddle Mountain	3090	0.0	0.0	*	83.5	77.5	108
Railroad Overpass	2680	0.0	0.0	*	51.3	43.6	118
Marion Forks	2590	0.0	3.4	0	68.2	62.8	109
Seine Creek	2070	0.0	0.0	*	62.1	60.4	103
Miller Woods	420	0.0	0.0₍₁₄₎	*	49.3	47.6₍₁₄₎	104
Basin Index (%)		108			108
LEWIS, COWLITZ
June Lake	3440	42.7	38.2	112	128.4	140.3	92
Lone Pine	3940	45.8	37.8	121	85.8	83.4	103
Paradise	5150	69.7	78.7	89	84.8	98.2	86
Pigtail Peak	5800	53.5	55.0	97	57.9	69.5	83
Potato Hill	4480	34.8	29.5	118	51.3	54.2	95
Sheep Canyon	3990	41.3	35.0	118	135.5	113.6	119
Spencer Meadow	3400	22.8	29.2	78	82.8	85.3	97
Spirit Lake	3520	0.0	0.4	0*	72.4	73.1	99
Lost Horse	5100	9.8	15.2	64	20.3	26.4	77
Surprise Lakes	4280	47.6	47.3	101	82.2	86.8	95
Basin Index (%)		100			96
WHITE, GREEN, CEDAR, SKYKOMISH, SNOQUALMI, BAKER, SKAGIT
Corral Pass	5810	33.0	37.8₍₂₉₎	87	41.0	48.3₍₂₉₎	85
Meadows Pass	3230	14.1	22.8₍₂₇₎	62	67.6	80.0₍₂₇₎	84
Mount Gardner	2930	0.0	10.0₍₂₇₎	0	65.1	82.7₍₂₇₎	79
Tinkham Creek	3000	14.1	24.6₍₂₇₎	57	71.1	87.5₍₂₇₎	81
Cougar Mountain	3210	0.0	11.8	0	61.3	77.0	80
Olallie Meadows	4010	43.1	53.2	81	77.2	103.0	75
Rainy Pass	4880	24.2	37.4	65	33.7	47.6	71
Sawmill Ridge	4640	14.0	39.4₍₁₄₎	36	38.9	59.9₍₁₄₎	65
Stampede Pass	3850	22.6	36.3	62	50.5	70.6	72
Thunder Basin	4310	23.8	28.2	84	47.7	57.4	83
Basin Index (%)		63			78

-M = Missing data.
* = Analysis may not provide a valid measure of conditions.
N/A = Not available.

Footnotes for median and average:
(##) = If less than 30 years are available, this value specifies the number of years used for the median and average calculations.
Sites with less than 10 years available do not have medians or averages.

If the Basin Index (%) percent value is flagged as potentially invalid,
care should be taken to evaluate if the value is representative
of conditions in the basin.

The SNOW WATER EQUIVALENT represents the depth of water in the snowpack, if the
snowpack were melted, expressed in inches.

The WATER YEAR-TO-DATE-PRECIPITATION represents total precipitation since October 1st, expressed in inches.

Contact your state water supply staff for assistance.

Medians and averages are calculated for the period 1991-2020.

Provisional data, subject to revision.

* Site -- Either: (a) the current value is missing; (b) the median or average for the day is not available or is zero; or (c) for snow water equivalent, the median or average for the day is less than 10% of the maximum median or average value for the year.

* Basin - More than half of the stations for a basin with normals report missing or invalid data.

The basin index is calculated as the sum of the valid current values divided by the sum of the corresponding medians or averages and the resulting fraction multiplied by 100.