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Historic, Archive Document 

Do not assume content reflects current scientific knowledge, 
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FEDERAL-STATE COOPERATIVE 

SNOW SURVEYS AND IRRIGATION WATER FORECASTsfl 

1 CUHntNT StHl; 



Colorado River Drainage Basin 

By 

Division of Irrigation, Soil Conservation Service 
United States Department of Agriculture 
and 

Colorado Agricultural Experiment Station 



)ata included in this report were obtained by the agencies named above in 
:ooperation with the U. S. Forest Service, National Park Service, State Engi- 
leers of Colorado, Wyoming and New Mexico and other Federal, State and 
Deal organizations. 



I * June w 50 * 



As of 

MAY 1, 1950 



May 1, ly50 
WATER SUPPLY OUTLOOK 
COLORADO RIVER DRAINAGE 



, Snow accumulation on the headwaters of the Upper Colorado 
: River varies from a near all time high of 220% on the Green 
River in Southern Wyoming to very low in Northern New Mexico 
and Southwestern Colorado. Soil moisture conditions follow 
I the same pattern as snow cover. 

I 

i 

I The water supply outlook in Arizona is poor. There has 

j been very little snow during the winter months. Reservoir 

j storage is much below last year and be low normal. Stream- 

! flow is near record low. 



C0L0RA.D0 RIVER AND TRIBUTARIES 
IN COLORADO 

Colorado River (above Glenwood Springs): From the May 1 snow surveys 
the outlook for this section is favorable. The snow accumulation is 105$ 
of average and 110$ of last year. The Roaring Fork fell to slightly below 
normal, being 91% of both normal and last year. Precipitation in this 
area has been about average for April. In the lower elevations the snow 
is melting fast, but at the higher elevations the snow is about normal. 
Ground moisture is reported as fair. 

Gunnison xiiver: The snow accumulation in this area is only about 80;b of 
normal and d$% of last year. On the North Fork and other areas to the 
north of the river the water supply outlook is good, but to the south 
around Marshall Creek Pass and west along the Continental Divide the snow- 
is considerably below normal. There is no point on this drainage where 
the average is above normal to any extent, Storage in Taylor Park reser- 
voir is 75,325 compared to 62,200 a year ago. Soil moisture conditions 
in this area are reported as fair. The precipitation has been about 
50/o of normal. Streamflow is about average. 

Yampa and White Rivers: The Yampa and the White have similar snow accu- 
mulations with the Yampa 113 and the white 115% of normal. The Yampa is 
108% of last year, but the White is only about ?2% of last year. Higher 
elevation snow courses are considerably above normal but the lower courses 
are from slightly below to about normal. Soil moistue, range and crop 
conditions ere described as good. The summer flow of these streams should 
be normal or slightly above. 

Miscellaneous Series Paper No. U6 Q , Colorado Agricultural Experiment Station 



(1) 



WATER CONTENT OF SNOW ON THE WATERSHEDS OF 
PLATTE .ARKANSAS, UPPER COLORADO AND RiO GRANDE BASINS 
BASED ON SNOW SURVEYS MADE APPROXIMATELY FIRST DAY OF MONTH 

In For cent of Normal 
Kay 1, 1950 




Note: The above numbers represent actual snow cover on the sno? courses 
on the watershed in percent of normal May 1, 1950. Those numbers do not 
necessarily coincide with expected summer runoff. 



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Federal - State - Private 
COOPERATIVE SNOW SURVEYS 



Furnishes the basic data 
necessary for forecasting 
water supply for irrigation, 
domestic and municipal water 
supply, hydro-electric power 
generation, navigation, 
mining and industry 



"WATER IS THE WEST'S GREATEST RESOURCE"