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. f71Iq;fi?J(f:;c,. . ~f?;:~: 19~':!t;4 ,1r'Q 'V.</r", !jj;/ . 'II~ <cl? NORTHERN UTAH: Water supply forecasts on May 1 generally indicate 5-rf"P~~Ren rise from those issued last month, ranging from 121 percent on the Logan tounearly three times normal for streams in Utah and Salt Lake Counties. The exception to "his trend was over the Bear and Logan River drainages where there were very slight decreases in the forecasts. However, Parleys, Mill, City and Emigration Creeks in the Salt Lake City area increased 20 to 30 percent. WATER SUPPLY OUTLOOK FOR UTAH .-- 00 1 'I H as of lAay I, 1984 Flood potential continues to increase. May through July forecasts indicate volumetric amounts only slightly less than those received last year. The combination of cool, wet weather, saturated soils and below normal evapora- tion is setting the stage for another rapid rise in streamflow conditions as well as levels or the Great Salt Lake and Utah Lake. The heavy snow pack in the Oquirrh and Lake mountains is expected to add to the high water problems of the Great Salt Lake, Utah Lak~ as well as the flood conditions in the Tooele and Cedar Valleys. April' precipitation west of the Wasatch Front was well above normal ranging from 150 to 200 percent of normal. Over che Bear River, Upper Weber and Provo River Basins amounts ranged from near normal to slightly below normal. Seasonal precipitation (October thru April) over the entire northern portion of the state remains high with amounts reaching 160 percent or higher from Cache County south into southern Utah County. Richmond in Cache County has reported 131 percent of normal. Snow surveys indicate that YBY 1 snowpacks are running well above normal over northemUtah. Bear River drainage - 142%; Logan - 135%; Ogden - 148%; Weber - 144%; Jordan - 176%; Provo - 152%. Reservoir storages throughout Utah are generally below the May 1 normal and in many cases significantly below last years May 1 contents. Observed April streamflow in northern Utah continues to run above normal. April runoff on the Weber River near Oakley was 114% of normal; Big Cottonwood Creek near Salt Lake City, 123%; Logan River near Logan, 136%; and Blacksmith Fork near Hyrum, 136%. The elevation of the Great Salt Lake on May 1st was 4208.10 feet msl, the high- est since 1379 when the Lake also reached 4208.10 feet. This is a rise of 0.75 feet since April 1st. The Lake has risen 3.30 feet since the low point of 4204.30 feet on September 23, 1932 and is 4.60 feet higher than a year ago at this time. During the record year of 1983, the Lake rose 1.30 feet from May 1st to the peak on July 1st. The Lake is expected to rise to a level of 4208.80 to 4209.50 feet by early this summer. This forecast has been raised 0.50 feet due to the extremely wet April in the vicinity of the Lake. NOAA-NATIONAL \VEATHER SERVICE COLORADO BASIN RIVER FORECAST ,CENTER, SALT LAKE CITY, UTAH Gerald Williams, Hydrologist in Charge