Lower Colorado River Basin SNOTEL Snow/Precipitation Update Report

Lower Colorado 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 Monday, May 19, 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
CHUSKA MOUNTAINS
Beaver Spring	9240	0.1	0.0₍₁₁₎	*	10.7	17.3₍₁₁₎	62
Navajo Whiskey Ck	9050	0.0	0.0₍₁₂₎	*	10.6	13.8₍₁₂₎	77
Basin Index (%)		*			68
LITTLE COLORADO - SOUTHERN HEADWATERS
Baker Butte	7360	0.1	0.0	*	-M	19.1	*
Baker Butte Smt	7720	0.3	0.0₍₁₂₎	*	11.6	18.0₍₁₂₎	64
Baldy	9210	0.0	0.0	*	7.1	14.9	48
Heber	7650	0.0	0.0	*	9.8	19.2	51
Maverick Fork	9210	0.2	0.0	*	5.3	15.8	34
Promontory	7930	-M	0.0	*	10.5	25.8	41
Basin Index (%)		*			47
VIRGIN RIVER BASIN
Gardner Peak	8320	0.0	0.0₍₁₆₎	*	13.6	17.4₍₁₆₎	78
Gutz Peak	6800	0.0	0.0₍₁₆₎	*	11.4	19.8₍₁₆₎	58
Harris Flat	7800	0.0	0.0	*	8.3	13.0	64
Kolob	9250	0.8	0.0	*	16.2	23.8	68
Little Grassy	6060	0.0	0.0	*	11.4	16.3	70
Long Flat	7990	0.0	0.0	*	10.6	14.2	75
Long Valley Jct	7460	0.0	0.0	*	9.7	13.8	70
Midway Valley	9830	0.4	7.2	6	17.1	24.1	71
Webster Flat	9150	0.0	0.0	*	15.8	20.4	77
Basin Index (%)		17*			70
VERDE RIVER BASIN
Baker Butte	7360	0.1	0.0	*	-M	19.1	*
Baker Butte Smt	7720	0.3	0.0₍₁₂₎	*	11.6	18.0₍₁₂₎	64
Bar M	6380	0.0	N/A	*	12.5	N/A	*
Chalender	7020	0.0	0.0₍₁₂₎	*	6.5	12.6₍₁₂₎	52
Fort Valley	7360	0.0	0.0₍₁₂₎	*	9.0	11.4₍₁₂₎	79
Fry	7220	0.1	0.0	*	10.4	17.8	58
Happy Jack	7520	0.0	0.0₍₂₁₎	*	11.2	N/A	*
Mormon Mountain	7490	0.2	0.0	*	-M	19.8	*
Mormon Mtn Summit	8450	0.2	0.0₍₁₂₎	*	15.0	21.6₍₁₂₎	69
White Horse Lake	7190	0.0	0.0	*	10.7	15.7	68
Basin Index (%)		*			65
CENTRAL MOGOLLON RIM
Baker Butte	7360	0.1	0.0	*	-M	19.1	*
Baker Butte Smt	7720	0.3	0.0₍₁₂₎	*	11.6	18.0₍₁₂₎	64
Heber	7650	0.0	0.0	*	9.8	19.2	51
Promontory	7930	-M	0.0	*	10.5	25.8	41
Basin Index (%)		*			51
UPPER SALT RIVER BASIN / WHITE MOUNTAINS
Baldy	9210	0.0	0.0	*	7.1	14.9	48
Beaver Head	8070	-M	0.0₍₂₇₎	*	3.5	N/A	*
Coronado Trail	8400	0.0	0.0	*	3.8	11.4	33
Hannagan Meadows	9030	0.0	0.0	*	5.8	17.6	33
Hawley Lake	8290	0.0	N/A	*	9.6	N/A	*
Maverick Fork	9210	0.2	0.0	*	5.3	15.8	34
Nutrioso	8550	0.0	0.0₍₁₂₎	*	4.2	7.5₍₁₂₎	56
Wildcat	7850	0.0	0.0	*	3.8	13.0	29
Workman Creek	7030	0.1	0.0	*	8.8	23.6	37
Basin Index (%)		*			37
SAN FRANCISCO RIVER BASIN
Beaver Head	8070	-M	0.0₍₂₇₎	*	3.5	N/A	*
Coronado Trail	8400	0.0	0.0	*	3.8	11.4	33
Frisco Divide	8010	0.0	0.0	*	3.6	9.6	38
Hannagan Meadows	9030	0.0	0.0	*	5.8	17.6	33
Nutrioso	8550	0.0	0.0₍₁₂₎	*	4.2	7.5₍₁₂₎	56
Silver Creek Divide	9080	0.0	0.0	*	5.8	17.6	33
Basin Index (%)		*			36
UPPER GILA RIVER BASIN
Lookout Mountain	8510	0.0	0.0	*	4.1	9.0	46
Signal Peak	8390	0.0	0.0	*	3.9	12.4	31
Silver Creek Divide	9080	0.0	0.0	*	5.8	17.6	33
Basin Index (%)		*			35

-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.