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	10190	0.6	1.7	35	18.0	26.8	67
Castle Peak	11500	-M	N/A	*	-M	N/A	*
Cochetopa Pass	10020	0.8	3.4₍₁₆₎	24	9.7	17.6₍₁₆₎	55
Columbine Pass	9160	0.0	1.2	0	18.2	34.1	53
Idarado	9780	0.8	2.4	33	21.0	31.6	66
Mc Clure Pass	8760	1.0	1.6	62	22.9	32.5	70
Mesa Lakes	10160	1.6	1.4	114	19.9	33.8	59
Overland Res.	9890	1.9	2.8	68	16.7	29.8	56
Park Cone	9600	1.0	1.8	56	14.3	20.0	72
Park Reservoir	9990	1.0	1.7	59	24.2	39.8	61
Porphyry Creek	10790	0.4	1.7	24	22.9	26.6	86
Rat Creek	11680	-M	N/A	*	-M	N/A	*
Red Mountain Pass	11050	0.1	2.6	4	28.5	41.4	69
Sargents Mesa	11490	0.9	3.4₍₁₂₎	26	17.1	24.1₍₁₂₎	71
Schofield Pass	10640	0.0	2.2	0	33.9	46.8	72
Slumgullion	11560	0.5	2.2	23	15.6	24.2	64
Upper Taylor	10710	0.6	2.6₍₁₁₎	23	21.2	30.8₍₁₁₎	69
Wager Gulch	11110	0.8	N/A	*	16.8	N/A	*
Basin Index (%)		34			66
UPPER COLORADO RIVER BASIN
Arapaho Ridge	10960	0.1	1.8₍₁₈₎	6	28.7	37.3₍₁₈₎	77
Bear River	9100	0.5	1.9₍₁₆₎	26	18.5	24.7₍₁₆₎	75
Beaver Ck Village	8530	0.3	1.5₍₁₇₎	20	19.0	27.0₍₁₇₎	70
Berthoud Summit	11300	0.0	2.4	0	34.3	40.4	85
Bison Lake	10950	0.3	1.4	21	27.9	41.0	68
Buffalo Park	9240	0.0	1.0₍₂₅₎	0	24.8	25.0₍₂₅₎	99
Castle Peak	11500	-M	N/A	*	-M	N/A	*
Chapman Tunnel	10090	0.7	2.7₍₁₃₎	26	23.2	31.5₍₁₃₎	74
Columbine	9170	0.3	1.3	23	35.7	37.4	95
Copper Mountain	10500	0.0	1.7	0	23.2	29.3	79
Elliot Ridge	10550	1.1	N/A	*	27.6	N/A	*
Fool Creek	11130	0.7	N/A	*	27.6	N/A	*
Fremont Pass	11310	0.6	2.0	30	22.8	29.3	78
Grizzly Peak	11110	0.0	2.0	0	25.8	30.8	84
High Lonesome	10630	0.5	N/A	*	27.2	N/A	*
Hoosier Pass	11600	0.4	2.2	18	22.9	29.6	77
Independence Pass	10570	0.6	2.0	30	23.9	30.0	80
Ivanhoe	10540	0.3	1.6₍₂₉₎	19	29.8	35.4₍₂₉₎	84
Jones Pass	10420	0.7	2.4₍₂₁₎	29	26.5	34.2₍₂₁₎	77
Kiln	9610	0.3	1.5	20	20.1	24.0	84
Lake Irene	10680	0.3	1.8	17	30.5	35.0	87
Lynx Pass	8910	0.5	1.5	33	17.9	23.2	77
Mc Clure Pass	8760	1.0	1.6	62	22.9	32.5	70
Mccoy Park	9500	0.4	1.6₍₁₈₎	25	20.7	28.8₍₁₈₎	72
Mesa Lakes	10160	1.6	1.4	114	19.9	33.8	59
Middle Fork Camp	8960	0.6	1.6₍₁₉₎	38	20.1	25.7₍₁₉₎	78
Nast Lake	8710	1.4	1.4	100	19.8	20.6	96
North Lost Trail	9190	0.0	2.0	0	22.7	35.4	64
Overland Res.	9890	1.9	2.8	68	16.7	29.8	56
Park Reservoir	9990	1.0	1.7	59	24.2	39.8	61
Phantom Valley	9030	0.2	2.1	10	19.4	24.4	80
Schofield Pass	10640	0.0	2.2	0	33.9	46.8	72
Stillwater Creek	8760	0.2	0.9	22	15.3	18.8	81
Summit Ranch	9350	0.0	1.4	0	17.3	24.4	71
Vail Mountain	10290	0.7	1.5	47	22.9	34.6	66
Willow Creek Pass	9520	0.4	1.4	29	19.3	26.2	74
Basin Index (%)		27			76
SOUTH PLATTE RIVER BASIN
Bear Lake	9490	0.6	2.0	30	28.9	33.8	86
Berthoud Summit	11300	0.0	2.4	0	34.3	40.4	85
Black Mountain	8950	0.1	2.2₍₁₀₎	5	21.4	27.6₍₁₀₎	78
Buckskin Joe	11160	1.2	2.7₍₂₁₎	44	21.5	28.8₍₂₁₎	75
Copeland Lake	8570	0.3	1.9	16	20.6	27.2	76
Deadman Hill	10240	0.0	1.6	0	25.8	30.6	84
Echo Lake	10660	0.7	3.4₍₂₂₎	21	16.0	26.3₍₂₂₎	61
Hoosier Pass	11600	0.4	2.2	18	22.9	29.6	77
Hourglass Lake	9380	0.5	2.2₍₁₂₎	23	20.2	25.0₍₁₂₎	81
Jackwhacker Gulch	11030	0.8	2.3₍₂₂₎	35	26.3	30.6₍₂₂₎	86
Joe Wright	10140	0.6	1.8	33	37.1	43.6	85
Lake Eldora	9700	0.0	1.6	0	26.6	30.1	88
Lake Irene	10680	0.3	1.8	17	30.5	35.0	87
Long Draw Resv	9990	0.3	2.1₍₁₁₎	14	26.2	28.4₍₁₁₎	92
Loveland Basin	11410	0.8	2.2₍₂₈₎	36	23.9	33.4₍₂₈₎	72
Michigan Creek	10700	0.5	2.4₍₂₂₎	21	22.1	28.3₍₂₂₎	78
Niwot	9940	0.6	2.0	30	25.0	30.4	82
Rough And Tumble	10420	0.9	1.8₍₂₂₎	50	12.4	20.1₍₂₂₎	62
Sawtooth	9640	0.7	N/A	*	36.9	N/A	*
University Camp	10330	0.1	2.2	5	28.2	36.2	78
Wild Basin	9410	0.2	2.3₍₁₅₎	9	24.6	30.6₍₁₅₎	80
Willow Park	10710	0.2	2.0	10	32.0	37.3	86
Basin Index (%)		20			81
LARAMIE AND NORTH PLATTE RIVER BASINS
Arapaho Ridge	10960	0.1	1.8₍₁₈₎	6	28.7	37.3₍₁₈₎	77
Blackhall Mtn	9830	0.0	1.1₍₁₁₎	0	35.8	43.9₍₁₁₎	82
Columbine	9170	0.3	1.3	23	35.7	37.4	95
Deadman Hill	10240	0.0	1.6	0	25.8	30.6	84
Joe Wright	10140	0.6	1.8	33	37.1	43.6	85
Never Summer	10300	0.5	2.0₍₁₈₎	25	23.6	32.6₍₁₈₎	72
Rawah	9100	0.2	1.5₍₁₈₎	13	21.8	28.4₍₁₈₎	77
Roach	9710	0.0	1.5	0	25.5	32.8	78
Tower	10610	0.3	1.5	20	52.5	58.4	90
Whiskey Park	8950	0.2	1.1	18	37.9	42.6	89
Willow Creek Pass	9520	0.4	1.4	29	19.3	26.2	74
Zirkel	9320	0.3	1.6₍₁₈₎	19	38.1	43.3₍₁₈₎	88
Basin Index (%)		16			84
YAMPA AND WHITE RIVER BASINS
Battle Mountain	7460	0.7	0.6	117	19.0	24.0	79
Bear River	9100	0.5	1.9₍₁₆₎	26	18.5	24.7₍₁₆₎	75
Bison Lake	10950	0.3	1.4	21	27.9	41.0	68
Buffalo Park	9240	0.0	1.0₍₂₅₎	0	24.8	25.0₍₂₅₎	99
Burro Mountain	9290	0.3	1.3	23	21.7	31.9	68
Columbine	9170	0.3	1.3	23	35.7	37.4	95
Crosho	8960	0.1	1.0	10	22.5	26.4	85
Divide Peak	8700	0.2	0.7	29	26.9	32.0	84
Dry Lake	8240	0.1	1.0	10	30.9	37.9	82
Elk River	8710	0.2	1.3	15	22.7	31.2	73
Elkhead Divide	8780	0.1	N/A	*	26.2	N/A	*
Little Snake River	8930	0.0	1.0₍₁₆₎	0	39.1	47.4₍₁₆₎	82
Lost Dog	9340	0.2	1.2₍₂₂₎	17	28.5	37.6₍₂₂₎	76
Lynx Pass	8910	0.5	1.5	33	17.9	23.2	77
Old Battle	9850	0.3	1.2	25	36.9	50.2	74
Rabbit Ears	9390	0.2	1.0	20	37.7	45.2	83
Ripple Creek	10340	0.0	1.0	0	31.2	39.1	80
Sage Creek Basin	7830	0.1	0.6₍₁₉₎	17	16.1	22.4₍₁₉₎	72
Sandstone RS	8150	0.0	0.8	0	20.1	27.6	73
Tower	10610	0.3	1.5	20	52.5	58.4	90
Trapper Lake	9750	0.1	1.2	8	24.0	32.0	75
Whiskey Park	8950	0.2	1.1	18	37.9	42.6	89
Basin Index (%)		19			80
ARKANSAS RIVER BASIN
Apishapa	10000	0.7	3.0	23	9.4	26.0	36
Brumley	10570	0.1	1.4	7	19.8	23.7	84
Fremont Pass	11310	0.6	2.0	30	22.8	29.3	78
Glen Cove	11410	2.7	4.1₍₁₆₎	66	18.7	30.0₍₁₆₎	62
Hayden Pass	10700	0.2	2.3₍₁₃₎	9	15.9	27.6₍₁₃₎	58
Medano Pass	9650	0.1	2.2₍₂₅₎	5	13.0	23.8₍₂₅₎	55
Porphyry Creek	10790	0.4	1.7	24	22.9	26.6	86
Saint Elmo	10420	0.5	2.5₍₁₃₎	20	16.5	24.7₍₁₃₎	67
South Colony	10790	0.5	4.1₍₂₉₎	12	24.0	42.5₍₂₉₎	56
Ute Creek	10730	1.5	3.5₍₂₀₎	43	16.7	30.2₍₂₀₎	55
Whiskey Ck	10260	2.1	3.6	58	16.0	32.8	49
Basin Index (%)		31			62
UPPER RIO GRANDE BASIN
Beartown	11600	0.0	2.6	0	22.9	39.0	59
Cochetopa Pass	10020	0.8	3.4₍₁₆₎	24	9.7	17.6₍₁₆₎	55
Culebra #2	10570	1.1	2.6	42	14.7	27.2	54
Cumbres Trestle	10030	0.5	2.2	23	21.1	38.7	55
Elwood Pass	11680	-M	N/A	*	-M	N/A	*
Grayback	11620	0.8	3.8₍₁₆₎	21	16.1	32.6₍₁₆₎	49
Hayden Pass	10700	0.2	2.3₍₁₃₎	9	15.9	27.6₍₁₃₎	58
Lily Pond	11060	0.5	2.4	21	13.3	31.6	42
Medano Pass	9650	0.1	2.2₍₂₅₎	5	13.0	23.8₍₂₅₎	55
Middle Creek	11260	1.4	2.6	54	19.0	39.4	48
Moon Pass	11110	1.8	3.6₍₁₂₎	50	10.7	19.8₍₁₂₎	54
North Costilla	10570	1.2	2.6	46	13.4	27.5	49
Rat Creek	11680	-M	N/A	*	-M	N/A	*
San Antonio Sink	9120	0.4	N/A	*	8.1	N/A	*
Sargents Mesa	11490	0.9	3.4₍₁₂₎	26	17.1	24.1₍₁₂₎	71
Shuree	10080	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	10850	0.4	1.8	22	13.3	22.6	59
Upper Rio Grande	9370	2.0	1.6	125	14.8	19.0	78
Ute Creek	10730	1.5	3.5₍₂₀₎	43	16.7	30.2₍₂₀₎	55
Wager Gulch	11110	0.8	N/A	*	16.8	N/A	*
Wolf Creek Summit	10930	0.2	1.9	11	25.7	49.8	52
Basin Index (%)		34			56
SAN MIGUEL, DOLORES, ANIMAS AND SAN JUAN RIVER BASINS
Beartown	11600	0.0	2.6	0	22.9	39.0	59
Black Mesa	11580	0.5	N/A	*	23.5	N/A	*
Cascade	8900	0.3	2.4	12	18.6	32.3	58
Cascade #2	8990	0.8	2.1	38	18.6	31.4	59
Columbine Pass	9160	0.0	1.2	0	18.2	34.1	53
Columbus Basin	10780	0.0	3.8₍₂₆₎	0	25.4	43.2₍₂₆₎	59
El Diente Peak	10210	0.0	1.8	0	19.0	32.4	59
Elwood Pass	11680	-M	N/A	*	-M	N/A	*
Lizard Head Pass	10190	0.0	2.8	0	17.1	27.6	62
Lone Cone	9730	0.0	2.4	0	15.5	34.1	45
Mancos	10020	1.1	2.9₍₂₆₎	38	14.3	30.7₍₂₆₎	47
Mineral Creek	10030	0.1	2.2	5	18.8	30.6	61
Molas Lake	10610	0.2	2.2	9	20.2	33.9	60
Red Mountain Pass	11050	0.1	2.6	4	28.5	41.4	69
Scotch Creek	9160	0.5	2.4	21	16.8	28.3	59
Sharkstooth	10730	0.4	4.5₍₁₆₎	9	21.4	39.4₍₁₆₎	54
Spud Mountain	10660	0.1	2.0	5	27.2	45.4	60
Stump Lakes	11230	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	10740	0.2	2.2	9	19.5	30.9	63
Weminuche Creek	10730	0.9	3.2₍₁₀₎	28	25.6	41.5₍₁₀₎	62
Wolf Creek Summit	10930	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.