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Last modified
1/26/2010 10:09:33 AM
Creation date
10/5/2006 4:26:24 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
281
County
Boulder
Community
Boulder
Stream Name
Boulder and Adjacent Boulder County Drainageways
Basin
South Platte
Title
Flood Hazard Area Delineation - Boulder and Adjacent County Drainageways
Date
5/1/1987
Designation Date
10/1/1987
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />Between Lehigh Street and Broadway, the floodplain generally follows the exterior <br />boundaries of Table Mesa Drive. The floodplain widens at cross streets with <br />Table Mesa. This is caused by the culverts built for those streets. As the <br />creek approaches Broadway, the floodplain becomes wider. Downstream from <br />Gillaspie Drive, the floodplain extends eastward as the terrain starts to flatten <br />out. Commercial development also increases in this area. The floodplain crosses <br />approximately 450 feet of Broadway. Again damages are not heavy, as only 2 <br />buildings are within the floodplain. <br /> <br />south of Arapahoe Road. The floodplain is a fairly uniform 75 feet in width for <br />750 feet downstream of Mohawk Drive. As the stream approaches Foothills Parkway <br />and the Skunk Creek floodplain, the Bear Creek floodplain widens on the west side <br />of the creek. On the east side of the creek, the floodplain extends to within <br />100 feet of Hancock Drive near Foothills Parkway. The flood profiles and flood- <br />plain delineation immediately upstream of Arapahoe have been revised to reflect <br />the installation of larger culverts by the Highway Department and overbank <br />grading by a developer. North of Arapahoe Road to the creek's confluence with <br />Boulder Creek, a broad area is flooded to approximately 1 foot of depth. The <br />widest area of the floodplain extends approximately 200 feet on the east side of <br />the creek. Property damage is light in this downstream portion of the creek, as <br />only 3 small buildings are within the floodplain. <br /> <br />Downstream from Broadway, the wide floodplain intersects Eastman Avenue on the <br />west side of the stream. Eastman conveys its water to 35th Street, and 35th <br />Street carries the water down to Martin Drive. Between Martin Drive and Highway <br />36, a continuous floodplain boundary lies to the east of the creek. This <br />boundary is 250 feet east of the creek at Martin Drive. It follows along the <br />western half of Chase Circle and returns very close to the creek at Moorhead <br />Avenue. The floodplain on the west side of the creek between Martin Drive and <br />Highway 36 is not continuous. Three-fourths of the area west of the creek and <br />between Martin and Berkeley Avenue is not flooded. Immediately downstream from <br />this area, a residential area which is built around Berkeley Avenue is flooded. <br />Twenty homes are effected by the floodplain in this area. <br /> <br />Skunk Creek <br /> <br />The floodplain upstream from the Kings Gulch confluence with Skunk Creek ranges <br />from narrow and confined in steep channel banks to wide where overland shallow <br />flooding occurs within Green Mountain Cemetery. Street flooding occurs near the <br />upstream study limit. <br /> <br />Downstream of Highway 36 broad, shallow flooding occurs to Baseline Road. <br />The floodplain approaches 1300 feet in width at its widest point. Only a <br />commercial building is located within the floodplain near Baseline Road. North <br />of Baseline Road, the floodplain becomes narrow as the creek's channel is larger <br />and street flow occurs along Gilpin Drive. <br /> <br />The floodplain maintains a fairly uniform width of about 200 feet as it enters <br />Green Mountain Cemetery. However, about halfway through the cemetery, the land <br />slopes off to the north. This results in shallow overland flooding which flows <br />northward from the cemetery. Some of the flow returns to the floodplain while <br />the rest of the flow enters Kings Avenue east of 21st Street. North of the Kings <br />Gulch confluence with Skunk Creek, the floodplain is approximately 1700 feet <br />wide. This width is maintained as the floodplain crosses Broadway. Property <br />damages are moderately heavy in this area as 27 buildings are flooded. <br /> <br />The floodplain is narrow along the creek bed and Gilpin Drive, leaving most <br />of the area between the creek and the street dry. Floodwaters from Gilpin Drive <br />flow onto Inca Parkway and then onto Mohawk Drive. A large amount of property <br />damage occurs as a result of this flooding pattern. Twenty-two residential <br />buildings incur shallow flooding. <br /> <br />Between Broadway and 30th Streets, the floodplain ranges from 1700 feet to 100 <br />feet. The floodplain is restricted as it passes through large culverts, notably, <br />the culverts at U.S. 36 and Baseline Road. Some street flow occurs down 29th <br />Street to Bixby. All of the water returns to the channel. Property damage <br />remains moderately heavy upstream of U.S. 36, but becomes light downstream of <br />U.S. 36. From 30th Street where the floodplain is 500 feet wide, to Colorado <br />Avenue where the floodplain is 2000 feet wide, a large amount of property damage <br /> <br />From Mohawk Drive to the creek's confluence with Boulder Creek, the floodplain <br />ranges from being narrow to very extensive. The width of the floodplain is <br />influenced by Skunk Creek, which flows into Bear Creek approximately 530 feet <br /> <br />26 <br />
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