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<br />Executive Summary <br /> <br />. The Town of New Castle reported approximately 1.5 inches in 15 minutes, and a NOAA <br />event record reported one inch in less than 20 minutes. This precipitation event is <br />equivalent to approximately a 100-year frequency event locally. <br /> <br />. No flow data was collected due to the fact that no gauged streams or creeks were directly <br />affected by the rainfall events. <br /> <br />. The heavy rain triggered a massive mudslide that flooded several homes and businesses in New <br />Castle. Total damages were estimated to be $32,000. <br /> <br />. Clearing debris from local roads and storm sewers was the majority of work that resulted from <br />the storm. The storm closed u.s. Highway 6 through town as well as several other local streets. <br />Up to 2 feet of mud and rocks were left behind after the flooding, and it took several days to clear <br />the debris; the cost of these efforts amounted to approximately $85,000. <br /> <br />Palisade/Grand Valley <br /> <br />. On September 13,2001 a slow moving thunderstorm dropped rainfall on the western portion <br />of Mesa County near the Town of Palisade. A NOAA Event Record characterized the <br />rainfall as "heavy," however, the local newspaper reported that 0.07 inch of rain fell within <br />a 12-hour period, less than a 2-year frequency event. <br /> <br />. No flow data was collected due to the fact that no gauged streams or creeks were directly <br />affected by the rainfall events. <br /> <br />. No public or private property damages or expenditures were reported. However, several <br />cleanup activities were required after the storm, including debris removal from the Interstate <br />70-Palisade exchange, reshaping drainage ditches, and cleaning storm sewer structures. <br />CDOT reported no serious traffic delays and 1-70 remained open throughout the entire time <br />period. Flood related damages incurred by CDOT were estimated to total approximately <br />$30,000. <br /> <br />Telluride to Placerville (San Miguel County) <br /> <br />. On August 8, 2001 slow moving thunderstorms over eastern San Miguel County dropped up <br />to 5 inches of rain in a 2-hour period, equivalent to approximately a ISO-year frequency <br />event locally. <br /> <br />. The majority of the effects of the event were in the southeastern portion of San Miguel <br />County between the Towns of Telluride and Placerville. The two watersheds most affected <br />by these flood events were the San Miguel River basin and the Upper Dolores River basin. <br />Several small streams to the north and south of the San Miguel River were also affected. <br /> <br />. According to USGS data, the San Miguel River discharge peaked at approximately 430 cfs, <br />approximately equivalent to a I-year frequency event. However, according to "The <br />Watershed Connection" the San Miguel River peaked well over 2,000 cfs, approximately <br />equivalent to a 5-year frequency event. <br /> <br />. Several smaller streams were more seriously affected, namely Bear Creek, Fall Creek, and <br />Deep Creek. San Miguel County reported that Bear Creek was flowing outside its banks and <br /> <br />URS <br /> <br />T:\PROJ ECTS\6844888 _ CWCB _FLOOD_DOC _RPTS\SUB _00\6.0 _PROJ_DELlV\REPORT\FI NAL REPORT .2. D0Q20-MAR-02\\ E S - 5 <br />