Colorado SNOTEL Precipitation Summary Update Report

Colorado SNOTEL Precipitation Summary 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 Monday, July 20, 2020

Basin Site Name	Elev (ft)
Basin Site Name	Elev (ft)	Month to Date Precipitation (in)	Median Monthly Total (in)	Pct of Monthly Total	Water Year to Date Precipitation (in)	Median Annual Total (in)	Pct of Annual Total
GUNNISON RIVER BASIN
Butte	10200	0.6	1.7	35	18.0	26.8	67
Cochetopa Pass	10061	0.8	3.4₍₁₆₎	24	9.7	17.6₍₁₆₎	55
Columbine Pass	9171	0.0	1.2	0	18.2	34.1	53
Idarado	9812	0.8	2.4	33	21.0	31.6	66
Mc Clure Pass	8774	1.0	1.6	62	22.9	32.5	70
Mesa Lakes	10168	0.7	1.4	50	19.0	33.8	56
Overland Res.	9893	1.9	2.8	68	16.7	29.8	56
Park Cone	9621	1.0	1.8	56	14.3	20.0	72
Park Reservoir	9987	1.0	1.7	59	24.2	39.8	61
Porphyry Creek	10788	0.4	1.7	24	22.9	26.6	86
Red Mountain Pass	11080	0.1	2.6	4	28.5	41.4	69
Sargents Mesa	11499	0.9	3.4₍₁₂₎	26	17.1	24.1₍₁₂₎	71
Schofield Pass	10653	0.0	2.2	0	33.9	46.8	72
Slumgullion	11560	0.5	2.2	23	15.6	24.2	64
Upper Taylor	10717	0.6	2.6₍₁₁₎	23	21.2	30.8₍₁₁₎	69
Wager Gulch	11132	0.8	N/A	*	16.8	N/A	*
Basin Index (%)		31			66
UPPER COLORADO RIVER BASIN
Arapaho Ridge	10976	0.1	1.8₍₁₈₎	6	28.7	37.3₍₁₈₎	77
Bear River	9112	0.5	1.9₍₁₆₎	26	18.5	24.7₍₁₆₎	75
Beaver Ck Village	8565	0.3	1.5₍₁₇₎	20	19.0	27.0₍₁₇₎	70
Berthoud Summit	11314	0.0	2.4	0	34.3	40.4	85
Bison Lake	10964	0.3	1.4	21	27.9	41.0	68
Buffalo Park	9249	0.0	1.0₍₂₅₎	0	24.8	25.0₍₂₅₎	99
Chapman Tunnel	10100	0.7	2.7₍₁₃₎	26	23.2	31.5₍₁₃₎	74
Columbine	9167	0.3	1.3	23	35.7	37.4	95
Copper Mountain	10523	0.0	1.7	0	23.2	29.3	79
Elliot Ridge	10549	1.1	N/A	*	27.6	N/A	*
Fool Creek	11156	0.7	N/A	*	27.6	N/A	*
Fremont Pass	11326	0.6	2.0	30	22.8	29.3	78
Grizzly Peak	11139	0.0	2.0	0	25.8	30.8	84
High Lonesome	10638	0.5	N/A	*	27.2	N/A	*
Hoosier Pass	11611	0.4	2.2	18	22.9	29.6	77
Independence Pass	10598	0.6	2.0	30	23.9	30.0	80
Ivanhoe	10541	0.3	1.6₍₂₉₎	19	29.8	35.4₍₂₉₎	84
Jones Pass	10426	0.7	2.4₍₂₁₎	29	26.5	34.2₍₂₁₎	77
Kiln	9624	0.3	1.5	20	20.1	24.0	84
Lake Irene	10682	0.3	1.8	17	30.5	35.0	87
Lynx Pass	8919	0.5	1.5	33	17.9	23.2	77
Mc Clure Pass	8774	1.0	1.6	62	22.9	32.5	70
Mccoy Park	9516	0.4	1.6₍₁₈₎	25	20.7	28.8₍₁₈₎	72
Mesa Lakes	10168	0.7	1.4	50	19.0	33.8	56
Middle Fork Camp	8969	0.6	1.6₍₁₉₎	38	20.1	25.7₍₁₉₎	78
Nast Lake	8731	1.4	1.4	100	19.8	20.6	96
North Lost Trail	9219	0.0	2.0	0	22.7	35.4	64
Overland Res.	9893	1.9	2.8	68	16.7	29.8	56
Park Reservoir	9987	1.0	1.7	59	24.2	39.8	61
Phantom Valley	9045	0.2	2.1	10	19.4	24.4	80
Schofield Pass	10653	0.0	2.2	0	33.9	46.8	72
Stillwater Creek	8880	0.2	0.9	22	15.3	18.8	81
Summit Ranch	9371	0.0	1.4	0	17.3	24.4	71
Vail Mountain	10310	0.7	1.5	47	22.9	34.6	66
Willow Creek Pass	9523	0.4	1.4	29	19.3	26.2	74
Basin Index (%)		26			76
SOUTH PLATTE RIVER BASIN
Bear Lake	9522	0.6	2.0	30	28.9	33.8	86
Berthoud Summit	11314	0.0	2.4	0	34.3	40.4	85
Black Mountain	8980	0.1	2.2₍₁₀₎	5	21.4	27.6₍₁₀₎	78
Buckskin Joe	11166	1.2	2.7₍₂₁₎	44	21.5	28.8₍₂₁₎	75
Copeland Lake	8555	0.3	1.9	16	20.6	27.2	76
Deadman Hill	10239	0.0	1.6	0	25.8	30.6	84
Echo Lake	10694	0.7	3.4₍₂₂₎	21	16.0	26.3₍₂₂₎	61
Hoosier Pass	11611	0.4	2.2	18	22.9	29.6	77
Hourglass Lake	9417	0.5	2.2₍₁₂₎	23	20.2	25.0₍₁₂₎	81
Jackwhacker Gulch	11054	0.8	2.3₍₂₂₎	35	26.3	30.6₍₂₂₎	86
Joe Wright	10158	0.6	1.8	33	37.1	43.6	85
Lake Eldora	9728	0.0	1.6	0	26.6	30.1	88
Lake Irene	10682	0.3	1.8	17	30.5	35.0	87
Long Draw Resv	10008	0.3	2.1₍₁₁₎	14	26.2	28.4₍₁₁₎	92
Loveland Basin	11427	0.8	2.2₍₂₈₎	36	23.9	33.4₍₂₈₎	72
Michigan Creek	10702	0.5	2.4₍₂₂₎	21	22.1	28.3₍₂₂₎	78
Niwot	9979	0.6	2.0	30	25.0	30.4	82
Rough And Tumble	10432	0.9	1.8₍₂₂₎	50	12.4	20.1₍₂₂₎	62
Sawtooth	9676	0.7	N/A	*	36.9	N/A	*
University Camp	10360	0.1	2.2	5	28.2	36.2	78
Wild Basin	9439	0.2	2.3₍₁₅₎	9	24.6	30.6₍₁₅₎	80
Willow Park	10732	0.2	2.0	10	32.0	37.3	86
Basin Index (%)		20			81
LARAMIE AND NORTH PLATTE RIVER BASINS
Arapaho Ridge	10976	0.1	1.8₍₁₈₎	6	28.7	37.3₍₁₈₎	77
Blackhall Mtn	9839	0.0	1.1₍₁₁₎	0	35.8	43.9₍₁₁₎	82
Columbine	9167	0.3	1.3	23	35.7	37.4	95
Deadman Hill	10239	0.0	1.6	0	25.8	30.6	84
Joe Wright	10158	0.6	1.8	33	37.1	43.6	85
Never Summer	10323	0.5	2.0₍₁₈₎	25	23.6	32.6₍₁₈₎	72
Rawah	9069	0.2	1.5₍₁₈₎	13	21.8	28.4₍₁₈₎	77
Roach	9740	0.0	1.5	0	25.5	32.8	78
Tower	10620	0.3	1.5	20	52.5	58.4	90
Whiskey Park	9020	0.2	1.1	18	37.9	42.6	89
Willow Creek Pass	9523	0.4	1.4	29	19.3	26.2	74
Zirkel	9338	0.3	1.6₍₁₈₎	19	38.1	43.3₍₁₈₎	88
Basin Index (%)		16			84
YAMPA AND WHITE RIVER BASINS
Battle Mountain	7498	0.7	0.6	117	19.0	24.0	79
Bear River	9112	0.5	1.9₍₁₆₎	26	18.5	24.7₍₁₆₎	75
Bison Lake	10964	0.3	1.4	21	27.9	41.0	68
Buffalo Park	9249	0.0	1.0₍₂₅₎	0	24.8	25.0₍₂₅₎	99
Burro Mountain	9317	0.3	1.3	23	21.7	31.9	68
Columbine	9167	0.3	1.3	23	35.7	37.4	95
Crosho	8973	0.1	1.0	10	22.5	26.4	85
Divide Peak	8730	0.2	0.7	29	26.9	32.0	84
Dry Lake	8271	0.1	1.0	10	30.9	37.9	82
Elk River	8739	0.2	1.3	15	22.7	31.2	73
Elkhead Divide	8800	0.1	N/A	*	26.2	N/A	*
Little Snake River	8928	0.0	1.0₍₁₆₎	0	39.1	47.4₍₁₆₎	82
Lost Dog	9327	0.2	1.2₍₂₂₎	17	28.5	37.6₍₂₂₎	76
Lynx Pass	8919	0.5	1.5	33	17.9	23.2	77
Old Battle	9860	0.3	1.2	25	36.9	50.2	74
Rabbit Ears	9411	0.2	1.0	20	37.7	45.2	83
Ripple Creek	10350	0.0	1.0	0	31.2	39.1	80
Sage Creek Basin	7850	0.1	0.6₍₁₉₎	17	16.1	22.4₍₁₉₎	72
Sandstone RS	8152	0.0	0.8	0	20.1	27.6	73
Tower	10620	0.3	1.5	20	52.5	58.4	90
Trapper Lake	9759	0.1	1.2	8	24.0	32.0	75
Whiskey Park	9020	0.2	1.1	18	37.9	42.6	89
Basin Index (%)		19			80
ARKANSAS RIVER BASIN
Apishapa	10027	0.7	3.0	23	9.4	26.0	36
Brumley	10594	0.1	1.4	7	19.8	23.7	84
Fremont Pass	11326	0.6	2.0	30	22.8	29.3	78
Glen Cove	11391	2.7	4.1₍₁₆₎	66	18.7	30.0₍₁₆₎	62
Hayden Pass	10699	0.2	2.3₍₁₃₎	9	15.9	27.6₍₁₃₎	58
Medano Pass	9668	0.1	2.2₍₂₅₎	5	9.8	23.8₍₂₅₎	41
Porphyry Creek	10788	0.4	1.7	24	22.9	26.6	86
Saint Elmo	10450	0.5	2.5₍₁₃₎	20	16.5	24.7₍₁₃₎	67
South Colony	10868	0.5	4.1₍₂₉₎	12	24.0	42.5₍₂₉₎	56
Ute Creek	10734	1.5	3.5₍₂₀₎	43	16.7	30.2₍₂₀₎	55
Whiskey Ck	10290	2.1	3.6	58	16.0	32.8	49
Basin Index (%)		31			61
UPPER RIO GRANDE BASIN
Beartown	11600	0.0	2.6	0	22.9	39.0	59
Cochetopa Pass	10061	0.8	3.4₍₁₆₎	24	9.7	17.6₍₁₆₎	55
Culebra #2	10562	1.1	2.6	42	14.7	27.2	54
Cumbres Trestle	10035	0.5	2.2	23	21.1	38.7	55
Grayback	11626	0.8	3.8₍₁₆₎	21	16.1	32.6₍₁₆₎	49
Hayden Pass	10699	0.2	2.3₍₁₃₎	9	15.9	27.6₍₁₃₎	58
Lily Pond	11069	0.5	2.4	21	13.3	31.6	42
Medano Pass	9668	0.1	2.2₍₂₅₎	5	9.8	23.8₍₂₅₎	41
Middle Creek	11269	1.4	2.6	54	19.0	39.4	48
Moon Pass	11128	1.8	3.6₍₁₂₎	50	10.7	19.8₍₁₂₎	54
North Costilla	10598	1.2	2.6	46	13.4	27.5	49
San Antonio Sink	9143	0.4	N/A	*	8.1	N/A	*
Sargents Mesa	11499	0.9	3.4₍₁₂₎	26	17.1	24.1₍₁₂₎	71
Shuree	10092	2.6	3.5₍₁₀₎	74	13.5	19.8₍₁₁₎	68
Slumgullion	11560	0.5	2.2	23	15.6	24.2	64
Trinchera	10922	0.4	1.8	22	13.3	22.6	59
Upper Rio Grande	9379	2.0	1.6	125	14.8	19.0	78
Ute Creek	10734	1.5	3.5₍₂₀₎	43	16.7	30.2₍₂₀₎	55
Wager Gulch	11132	0.8	N/A	*	16.8	N/A	*
Wolf Creek Summit	10957	0.2	1.9	11	25.7	49.8	52
Basin Index (%)		34			55
SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS
Beartown	11600	0.0	2.6	0	22.9	39.0	59
Black Mesa	11564	0.5	N/A	*	23.5	N/A	*
Cascade	8880	0.3	2.4	12	18.6	32.3	58
Cascade #2	9012	0.8	2.1	38	18.6	31.4	59
Columbine Pass	9171	0.0	1.2	0	18.2	34.1	53
Columbus Basin	10781	0.0	3.8₍₂₆₎	0	25.4	43.2₍₂₆₎	59
El Diente Peak	10217	0.0	1.8	0	19.0	32.4	59
Lizard Head Pass	10193	0.0	2.8	0	17.1	27.6	62
Lone Cone	9755	0.0	2.4	0	15.5	34.1	45
Mancos	10044	1.1	2.9₍₂₆₎	38	14.3	30.7₍₂₆₎	47
Mineral Creek	10046	0.1	2.2	5	18.8	30.6	61
Molas Lake	10631	0.2	2.2	9	20.2	33.9	60
Red Mountain Pass	11080	0.1	2.6	4	28.5	41.4	69
Scotch Creek	9195	0.5	2.4	21	16.8	28.3	59
Sharkstooth	10747	0.4	4.5₍₁₆₎	9	21.4	39.4₍₁₆₎	54
Spud Mountain	10674	0.1	2.0	5	27.2	45.4	60
Stump Lakes	11248	0.1	3.0	3	21.0	35.1	60
Upper San Juan	10140	0.0	2.0	0	28.1	51.0	55
Vallecito	10782	0.2	2.2	9	19.5	30.9	63
Weminuche Creek	10749	0.9	3.2₍₁₀₎	28	25.6	41.5₍₁₀₎	62
Wolf Creek Summit	10957	0.2	1.9	11	25.7	49.8	52
Basin Index (%)		10			58

-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.

The % Monthly Total represents the precipitation accumulated from the 1st day of the current
month through the current day found at selected SNOTEL sites in or near the basin compared
to the Median (or Average) total precipitation for the current month for those sites.

The % Annual Total represents the precipitation accumulated from the start of the water year
(Oct 1) through the current day found at selected SNOTEL sites in or near the basin compared
to the Median (or Average) total precipitation for the entire water year for those sites.

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.

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