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<br />. <br /> <br />Streamflow Records. As shown in table 4, stream gaging <br /> <br /> <br />stations have been maintained on Boulder Creek near Orodell, <br /> <br /> <br />Colorado since 1906, and on South Boulder Creek near Eldorado <br /> <br /> <br />Springs since 1888, with only minor interruptions in the record. <br /> <br /> <br />Both of these stations are located in the mountains. In addition <br /> <br /> <br />to these two long-term stations, there is a short record (1889-1909) <br /> <br /> <br />available from a former gaging station located in Boulder. Peak <br /> <br /> <br />discharge estimates are available at this site for the floods of <br /> <br />1894, 1914 and 1969. <br /> <br />Flood History, Floods in the Boulder Creek basin are pro- <br /> <br /> <br />duced by intense rainfall during either isolated or general storm <br /> <br /> <br />systems. In addition, there is normally an increase in flows <br /> <br /> <br />during the mountain snowmelt period in May and June which is fre- <br /> <br /> <br />quently augmented by rainfall runoff. Large floods in the basin <br /> <br /> <br />were reported in 1864, 1876, 1894, 1914, 1923, 1938 and 1969. <br /> <br /> <br />Descriptions of the last four floods are presented below. <br /> <br />. Flood of 29 May-2 June lB94. Heavy rains fell over the <br /> <br /> <br />mountains extending from the Colorado-Wyoming border southward <br /> <br /> <br />into the Republican and Arkansas River basins. Rainfall over the <br /> <br /> <br />Boulder and South Boulder Creek basins was particularly heavy. <br /> <br /> <br />Rainfall records for a 96-hour period ending at 3:00 a.m. on <br /> <br /> <br />2 June 1894 indicate that the mountain drainage area received from <br /> <br /> <br />4.5 to 6.0 inches of precipitation. Rainfall amounts over the <br /> <br /> <br />high plains gradually decreased from west to east and varied from <br /> <br /> <br />5 inches at Boulder to approximately 2.5 inches at the mouth. The <br /> <br /> <br />mountain rainfall combined with the snowmelt runoff to produce the <br /> <br /> <br />greatest flood known at Boulder, which came roaring down the valley <br /> <br />during the night of 30 May 1894. Buildings. bridges and even long <br /> <br />. <br /> <br />43 <br />