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<br />. <br /> <br />. <br /> <br />Floodplain reports for Boulder County have generillly included some <br />historic data. The objective of this study was to tie those data <br />together and discover additional primary historic material that would <br />expand the base of information about floods in Boulder County, <br /> <br />The majority of published hydrologic and engineering reports conducted <br />for Boulder County since the Olmstead report of 1910 were consulted. <br />Government reports since the 1880's were checked as well.2 <br /> <br />The information presented herein illustrates the meteorologic and <br />environmental factors, such as the predominance of rainstorm-caused <br />floods or the geography of the area. Also mentioned are the social <br />conditions, such as the encroachment of settlements on the floodplain <br />which, in turn, caused the floodplains to become larger. These factors <br />have combined to cause severe flood damage in Boulder County since <br />settlements began to develop in the late 1850's. <br /> <br />DRAINAGE BASINS <br /> <br />. <br /> <br />Boulder County's drainage is topographically divided into seven major <br />creek basins, The largest creek in the County is the 51. Vrain. Major <br />tributaries to that creek are North 51. Vrain, South 51. Vrain, <br />Lefthand, Dry Creek No.2, and Boulder Creeks. The major tributary <br />to Lefthand Creek is James Creek. The major tributaries to Boulder <br />Creek are Fourmile Creek. North Boulder Creek, Middle Boulder Creek, <br />South Boulder Creek, and Coal Creek. Rock Creek is a tributary to <br />Coal Creek. The map below illustrates the creek system in Boulder <br />County. <br /> <br />. <br />