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<br />Barker reservoir, located approximately 12 miles upstream of Boulder,
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<br />provides only incidental flood storage, and the effects of this struc-
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<br />ture on downstream peak flows diminishes rapidly with distance from the
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<br />STUDY AREA
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<br />BOULDER
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<br />The study area encompasses Boulder Creek through the City of Boulder
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<br />from 6th Street to 55th Street. The study area is divided into two
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<br />BOULDER
<br />CREEK,","
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<br />Lafayette
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<br />reaches. Reach
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<br />extends from the canyon mouth downstream to 17th
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<br />LoLtisvilte
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<br />Street. Reach II extends from 17th Street downstream to 55th Street.
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<br />CLIMATE
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<br />, BOLlOER
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<br />JEFFERSON
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<br />Boulder has a continental climate, characterized by wide ranges of
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<br />I WESTMINS
<br />.' ARVADA I
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<br />temperature and irregular annual and seasonal precipitation. Westerly
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<br />winds are dominant most of the year, but the Rocky Mountains block
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<br />atmospheric moisture originating from the Pacific Ocean. During the
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<br />spring and early summer months, these westerly winds lose their domi-
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<br />nence and moist air masses push in from the Gulf of Mexico causing
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<br />precipitation.
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<br />(~:';~ Golden .,r~i-"~<l,Tt."..
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<br />/,....). LAKEWOOD} '. j~~, '"
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<br />" " -" - -! Qi:." I HIlls
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<br />Temperatures at Boulder have ranged from 1020F to -330F and average
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<br />50.60F. Precipitation averages about 18 inches per year, with about 9.5
<br />
<br />inches of this total falling in the period from April through July.
<br />
<br />The average annual snowfall is about 6.9 inches.
<br />
<br />VICINITY
<br />
<br />MAP
<br />
<br />FIGURE ll-2
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<br />14
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<br />11,
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