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<br />BOULDER AND FLOODS <br />Boulder has a propensity for, but not a <br />frequency ot flooding. <br /> <br />Why: <br />We stand at the base of the foothills: <br />. 13 creeks cross our city. <br />. 150/0 is in floodplain <br />. More than 4,000 structures are affected <br /> <br />It has happened before: <br />. Boulder Creek 1894, then 1914, 1919, 1921, <br />1938 and 1969 <br />. Twomile Canyon Creek 1909, then again in fall <br />1933 <br />. South Boulder Creek 1938, then 1958 and 1969 <br />(with Bear Canyon Creek and Viele) <br /> <br />We have seen great regional floods: <br />. Big Thompson 1976 (140 fatalities, creation of <br />warning signs) <br />. Forth Collins 1997 (5 fatalities outside of <br />defined floodplain) <br />