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<br />SURFACE WATER SUPPLY <br /> <br />Former Water District No.9 comprises a 261 square mile area <br /> <br />and has a mean annual water yield of 45,665 ac-ft (1950-72) or 3.3 inches <br /> <br />of surface runoffl. Estimated mean annual precipitation for the district is <br /> <br />18 inches. Late spring and early summer snowmelt is a significant contri- <br /> <br />butor to runoff as 30 to 40% of the annual discharge measured at Morrison <br /> <br />occurs in the months of May and June. One-third of the land area in the <br /> <br />Bear Creek drainage bas in is above 9,000 feet elevation and almost two- <br /> <br />thirds of the area is above 7,000 feet. <br /> <br />Gaqinq Stations <br /> <br />There are presently two stream gaging stations in operation in <br /> <br />former Water District No.9. One station is located 1.3 miles upstream from <br /> <br />the mouth of Bear Creek and is referred to in water resources data publica- <br /> <br />tions as "Bear Creek at Mouth at Sheridan, Colorado". This station has <br /> <br />a contributing drainage area of 260 square miles and a period of record of <br /> <br />April to November 1914 and March 1927 to current year. Altitude of the gage <br /> <br />is 5,295 feet. Extremes for the period of record are: <br /> <br />Maximum Discharge - 8150 cfs (May 7, 1969) <br />Minimum Discharge - No flow (July 13, 1954) <br /> <br />The average discharge for 45 years of record (1927-72) is 36.5 cfs or 26,440 <br /> <br />ac-ft per year. There are approximately 9,000 irrigated acres above the <br /> <br />station. <br /> <br />1 Mean of the annual Bear Creek discharge at mouth at Sheridan plus the <br />consumptive use of all diversions. <br /> <br />-20- <br /> <br />~'. "::"..:.-.,-:.-' . <br /> <br />"''''<~''''''''''.-....-.:.:''''t._~~ :.. ,l',,'::-'_f'.." .._~...c..- ~':'I.7.-!....L''''~~' <br /> <br />-.--.,-- ":"",,""._~,...,,,...'t" ...,+ <br />