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<br />OCcurs. More than 75 residential and commercial buildings are flooded. Colorado <br />Avenue intercepts the floodwaters and conducts them eastward. This decreases the <br />width of the floodplain. Downstream of Colorado Avenue, a broad floodplain <br />occurs near the creek's confluence with Bear Creek. Although the floodplain is <br />at places more than 1500 feet wide, a small amount of damage results as this is a <br />very sparsely developed area. <br /> <br />Gregory Creek <br /> <br />The floodplain for Gregory Canyon Creek is significantly affected by the streets <br />within the drainage basin. Street flow occurs when the floodplain intersects a <br />street and floodwaters are then carried off down the street. <br /> <br />Bluebell Canyon Creek <br /> <br />The floodplain is basically narrow between the upstream study limit and College <br />Avenue. However, street flow results in shallow flooding in areas along Baseline <br />Road, Willow Street (north and south of the creek), Gilbert Street and Rose Hill <br />Dri ve. The streets genera lly do not overflow onto adjacent a rea s. Property <br />damage is moderate within this section of the creek as 13 residential buildings <br />are flooded. <br /> <br />The Bluebell Canyon Creek Floodplain is narrow and well confined in its upstream <br />reaches and is dominated by the street pattern over its lower reaches. From the <br />upstream study limit to 15th Street, the floodplain is narrow (about 50 feet <br />wide) within Bluebell Canyon. <br /> <br />Downstream, from 15 th Street to the creek' s con fl uence with Skunk Creek, the <br />floodplain is basically determined through shallow street flooding. Mariposa <br />Avenue conveys floodwaters to Broadway. At 20th Street, floodwaters travel <br />northward and then eastward on Baseline Road. Twenty-first Street is also flooded <br />between Columbine and Baseline. Flood damage is generally light within the <br />street flooding area. However, approximately 12 buildings are affected by <br />overland flooding between 15th and 19th Streets. <br /> <br />Between College Avenue and the stream's confluence with Boulder Creek the <br />floodplain becomes wider and continues to be affected by street flows. The <br />floodplain is 300 feet wide between College and Pleasant Avenues. Rose Hill <br />Drive conveys floodwaters across Arapahoe Road and into Boulder Creek. As the <br />floodplain intersects Pleasant Avenue on the east side of the creek, floodwaters <br />travel eastward along the street and overflow the street creating a shallow <br />flooding zone between Pleasant Avenue and University Avenue. Floodwaters reach <br />9th Street and travel northward on 9th Street north of University Avenue. The <br />floodplain downstream of Arapahoe Avenue is approximately 400 feet wide. <br />Property damage within this downstream portion of the creek is heavy. More than <br />50 residential and commercial buildings are flooded. <br /> <br />Kings Gulch <br /> <br />Kings Gulch has a flooding pattern similar to Bluebell Canyon Creek. A narrow <br />floodplain exists in the mountainous upstream portions of the basin. Approximately <br />800 feet downstream of the upstream study limit overland flooding occurs eastward <br />from the storm channel. Floodwaters travel down East Belleview Drive to 15th <br />Street. Two buildings are flooded. At 15th Street, the floodplain is 200 feet <br />wide. <br /> <br />Sunshine Canyon Gulch and Sunshine Canyon Tributary <br /> <br />From 15th Street, floodwaters flow down King Avenue to Skunk Creek. Between 15th <br />and 17th Streets, overland flow affects 7 buildings. At 17th Street, the flood- <br />plain is 450 feet wide. Overland shallow flooding covers the half block area <br />between 17th and 18th Streets. Floodwaters reach Bluebell Avenue and travel to <br />Skunk Creek. Property damage to the downstream sections of the basins is very <br />light. <br /> <br />The upstream floodplain of Sunshine Canyon Gulch and its tributary are very <br />similar. This portion of the stream flows from the upstream study limit to <br />Sunshine Canyon Road near Memorial Hospital. Both floodplains are narrow and <br />follow the creek beds within their steep channels. Damage is very light within <br />the floodplain as few buildings are present within the upstream reaches. <br /> <br />The floodplain between Sunshine Canyon Road and Spruce Street, range in width <br />from less than 5D feet, near Sunshine Canyon Road, to more than 300 feet at <br />Spruce Street. Eight buildings are flooded north of Spruce Street. Shallow <br /> <br />2.7 <br />