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<br />. <br /> <br />> <br /> <br />BOULDER CREEK AT BOULDER <br /> <br /> <br />Discharge profiles for the 500-, 100-, 50-, 25-, and 10-year <br /> <br /> <br />flood events were developed for Boulder Creek from the west end of <br /> <br /> <br />Boulder to the mouth of South Boulder Creek. These profiles were <br /> <br /> <br />developed using the modeling concepts discussed on pages 54 through <br /> <br /> <br />59. A basin description, flood history and the hydrologic studies <br /> <br /> <br />for Boulder Creek are discussed below. Hydrology studies for the <br /> <br />Boulder Creek basin from South Boulder Creek to the mouth are con- <br /> <br /> <br />tinuing and will be available at a later date. <br /> <br />Basin Description. Boulder Creek is a steep mountain stream <br /> <br /> <br />draining a portion of the eastern slope of the Rocky Mountains in <br /> <br /> <br />Boulder County. The creek extends 22 miles eastward from the Con- <br /> <br /> <br />tinental Divide to the mouth of the Canyon at Boulder. After <br /> <br /> <br />passing through Boulder it flows 18 additional miles across the <br /> <br /> <br />high plains to enter St. Vrain Creek 5 miles east of Longmont, <br /> <br /> <br />Colorado. The major tributaries are Fourmile Creek, which drains <br /> <br /> <br />about 25 square miles of mountain area and empties into Boulder <br /> <br /> <br />Creek just aownstream from the mouth of Boulder Canyon; South <br /> <br /> <br />Boulder Creek, which drains about 125 square miles of mostly <br /> <br /> <br />mountain area and joins Boulder Creek near Valmont Street in <br /> <br /> <br />Boulder; and Coal Creek, which drains about 80 square miles of <br /> <br /> <br />mostly high plains area and enters Boulder Creek near the mouth. <br /> <br />The total Boulder Creek basin is about 440 square miles at the <br /> <br /> <br />mouth and about 155 square miles above the mouth of South Boulder <br /> <br /> <br />Creek. Barker Reservoir, located about 12 miles upstream from <br /> <br /> <br />Boulder, provides only incidental flood storage, and the effects <br /> <br /> <br />of this structure on downstream peak flows diminishes rapidly <br /> <br /> <br />with distance from the dam. The basin map is shown on plate 59. <br /> <br />42 <br /> <br />. <br />