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Li A #Miress Correctim R""Ited THIRD-CLASS BULK RATE 001807 UNITED STATES DEPARTMENT OF AGRICULTURE SOIL CONSERVATION SERVICE POSTAGE AND FEES PAID United States SNOW SURVEY UNIT D partment Of 2490 WEST 26TH AVE. USDA-SCS e DENVER,COLORADO-80211 Agriculture OFFICIAL BUSINESS DENVER,COLORADO COLORADO A D PENALTY FOR PRIVATE USE,S3W PERMIT NO.G-267 Soil Conservation S*rvio* Denver, Colorado NEW M,,, EXIC 0 WA.,,, TE R S UPPL Y 0 U TL 00 K STREAMFLOW FORECAST AS OF 111111111111 GREEN M ANY MAY 1, 1934 I 1 1984 INfli-I P-1 R CONSERVATION BOARD :t X:j 'K, ,0,011 �Rl R-04 �F- f%v�1,! EP iv 511A Imp 7" �S . F, ",05 7 - , , "; -,,, , `� " , m 3 1 v? J'A F RK "'M V J*'! LEGEND A Forecast Point Watershed Boundaries 'J STREAMFLOW FORECASTS k Percent of 1961 Av e 010 �q 410 erag _% W - 130% Vlr� Ove, A 110-130% 90-110% 70- 90% V Under 70% f" 111MN 7 N M"M ",; N 7 The map on this page indicates the most probable water supply as of the date of this report. Estimates assume average conditions of snow fall., precipitation and other factors from this date to the end of the fore— �.....----- cast period. As the season progresses accuracy of estimates improve. Iri addition to expected strearnflow, reservoir storage, soil moisture in irrigated areas, and other factors are considered in estimating water sup— Ply. Estimates app!y to irrigated areas along the main streams and may riot indicate conditions on small tributaries. WATER SUPPLY CONDITIONS MAY 1, 1984 Date: May 1, 1984 ABOVE NORMAL PRECIPITATION HAS OCCURRED THROUGHOUT COLORADO AND NORTHERN SURFACE WATER SUPPLY INDEX NEW MEXICO DURING APRIL, INCREASING THE SNOWPACK AVERAGES FOR MAY FIRST. LOWER ELEVATION PRECIPITATION AT NATIONAL WEATHER SERVICE STATIONS REPORTED ABOVE YAMPA-WHITE N. PLATTE SOUTH PLATTE AVERAGE ACCUMULATIONS IN APRIL AS WELL. WITH RESERVOIRS CONTAINING ADEQUATE STORAGE LEVELS, EXCELLENT WATER SUPPLIES ARE EXPECTED FOR THE COMING SUMMER LEGEND _.-major rivers MONTHS. THE MAJORITY OF THE STREAMFLOW FORECASTS ARE CURRENTLY PROJECTING ABOVE basin boundaries Fit.71 Surface Water AVERAGE TO MUCH ABOVE AVERAGE FLOWS FOR THE SUMER FORECAST PERIOD.L ALL Supply Index SCALE FORECASTS ARE A JOINT EFFORT OF THE SOIL CONSERVATION SERVICE AND THE NATIONAL COLORADO +4-- WEATHER SERVICE- obuiidwt supply +2-- noof nomal COLORADO THE CENTRAL AND NORTHERN PORTIONS OF COLORADO HAS RECEIVED GUNNISON mo"rW# drftqht 3 r—sevoro drmqht A LARGE INCREASE IN SNOWPACK. AN INCREASE OF 22% HAS BROUGHT THE -4 extreme drought ARKANSAS STATEWIDE FIGURE TO 149% OF AVERAGE. THE ARKANSAS BASIN HAS THE HIGHEST SNOWPACK AT 191% OF AVERAGE. THE COLORADO RIVER BASIN I ilk R GRANDE S ALSO WELL ABOVE AVERAGE AT 169% OF AVERAGE, FOLLOWED CLOSELY BY THE GUNNISON BASIN AT 162%. NEARLY 40% OF THE 12.7 1 SNOW COURSE MEASUREMENTS MADE IN THE COLORADO AND GUNNISON RIVER DRAINAGES SET NEW RECORDS FOR MAY FIRST. STREAMFLOW FORECASTS ARE FOR MUCH ABOVE AVERAGE SAN JU4N DOLORES ON THE ARKANSAS, COLORADO, AND GUNNISON RIVERS. RESERVOIR STORAGE FOR COLORADO COLORADO IS CURRENTLY AT 146% OF AVERAGE. W mEXICO ALTHOUGH LOW ELEVATION PRECIPITATION HAS BEEN ABOVE The Surface Water Supply Index (SWSI) is a weighted value derived for each major basin which generally expresses the potential availability of the "q AVERAGE IN MANY LOCATIONS IN NORTHERN NEW MEXICO, SNOWPACK AVERAGES forthcoming season's water supply. The components used in computing the DECREASED 8% DURING THE MONTH TO 22% ABOVE AVERAGE DUE TO MELTING. STREAMFLOW index are reservoir storage, snowpack water equivalent, and precipitation. The SWSI number for each basin ranges from a -4.00 (prospective water supplies extremely poor) to a +4.00 (prospective water supplies plentiful). FORECASTS RANGE FROM A LOW OF 95% OF AVERAGE ON THE JEMEZ RIVER TO A HIGH ON The SWSI number is only a general indicator of surface water supply condi- SEVERAL MAJOR DRAINAGES NEAR 150% OF AVERAGE. RESERVOIR STORAGE IS CURRENTLY tions. Further data analyses may be required in specific situations to more fully understand the impacts of abnormally dry or wet conditions suggested by the SWSI- Development of the SWSI has been a cooperative effort between 248% OF AVERAGE AND 13% ABOVE LAST YEAR. the Colorado State Engineers' Office. and the Soil Conservation Service. ' The Conservation of Water begins with the Snow Survey" rof I M UWA WS PMLAM.OR,1211