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, \. ,. ~'- , - 5 - FLOOD SITUATION HYDROLOGIC DATA l , t Basic data stations that record information on precip- itation, snow depth and stream flow are available in the Breckenridge area. The locations of these stations are shown on Plate 2. The precipitation gage located at Breckenridge is a daily station with records from 1947. The precipitation gage located at Dillon is an hourly recorder with records dating back to 1907. , " i i i Snow course stations are maintained by the U.S. Depart- ment of Agriculture, Soil Conservation Service. The stations measure the snow depth and water content at intervals during the year. There are three such stations in the Breckenridge area with snow depths and water content information extending back 39 years. The U.S. Geological Survey maintains several continuously recording stream gages in the immediate area. The station of primary interest to the Breckenridge study is located down- stream of the town and has been in existence since 1957. Another U.S. Geological Survey gage was located further downstream and was in existence from 1911 to 1960; however, the construction of the Dillon Reservoir required that a new gage be estab- lished at its present location in 1957. From the combined history of the two gages, there are 64 years of stream flow records on the Blue River. FLOOD FLOWS High water resulting from snowmelt is the most prevalent type of flood flow occurring in the Blue River basin. Snow- melt generally begins the first of April and the peak runoff in the Blue River occurs in mid-June. Snowmelt then decreases and the flow of the river recedes the latter part of June and throughout July. ~ Leonard Rice Consulting Water Engineers,lnc.