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FLOOD08149
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Last modified
1/29/2010 10:12:02 AM
Creation date
10/5/2006 3:25:32 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
155
County
Adams
Jefferson
Community
Arvada
Stream Name
Clear Creek
Basin
South Platte
Title
FHAD - Clear Creek, Adams County and Jefferson County, Colorado
Date
11/1/1979
Designation Date
1/1/1980
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />business operations and some private residences are located in <br />the 100-year floodplain between Federal Boulevard and Sheridan <br />Boulevard. The major crossings in this reach are the Denver and <br />Rio Grande Western Railroad, Lowell Boulevard, Tennyson Street and <br />Sheridan Boulevard. The Denver and Rio Grande Western Railroad <br />causes Federal Boulevard overflows during the 100-year event, as <br />described above. Lowell Boulevard and Tennyson Street would also <br />spillover during this flood event. The Sheridan Boulevard crossing <br />does have 100-year capacity. <br />The 100-year floodplain from Sheridan Boulevard to the upstream <br />study limit can be separated into three reaches. The first reach <br />beginning at Sheridan Boulevard and ending at West 44th Avenue is <br />entirely within Jefferson County, except for a small segment of the <br />Creek in Denver County. This segment in Denver County starts at <br />approximately West 52nd Avenue and continues about 2,000 feet up- <br />stream to the Jefferson County corporate limits. The other two <br />reaches, from West 44th Avenue to the second 1-70 crossing, and <br />from this point to the study limit are entirely within Jefferson <br />County. <br />The floodplain immediately upstream from Sheridan Boulevard <br />is approximately 1,400 feet wide. This large, floodprone area is <br />due primarily to backwater behind the Sheridan Boulevard bridge. <br />The 100-year floodplain inundates several private residences and <br />commercial buildings in this area. From this backwater area up- <br />stream to Carr Street, the floodplain is essentially undeveloped <br />with only a few buildings in the floodprone area. From Carr Street <br />to the West 44th Avenue bridge, the floodplain is approximately <br />1,000 feet wide. This area (Sheet 12) is highly developed with <br />many single family residences in the 100-year floodplain. Major <br />road crossings in this reach include West 52nd Avenue, Marshall <br />Street, 1-70 East and 1-70 West, Wadsworth Boulevard and West 44th <br />Avenue. Only West 52nd Avenue and Wadsworth Boulevard crossings <br />have less than 100-year capacity. <br />The second reach in Jefferson County is from West 44th Avenue <br />to the second 1-70 crossing. Backwater areas behind West 44th Ave- <br />nue and Kipling Street are the primary cause of flooding in this <br />reach. The only other structures affected are those that border <br />the Creek on Pierson Street. There are also some large sump areas <br /> <br />Flood magnitudes greater than the 100-year magnitude can <br />and will occur. Land improvements adjacent to the 100-year flood- <br />plain limits should also consider the chance for possible flood <br />damage. <br /> <br />Flooded Areas <br /> <br />The 100-year floodplain limits and water surface profiles are <br />shown on the attached Flood Hazard Area Delineation maps and pro- <br />files (Sheets 1-29). The computed elevations at each reference <br />point are tabulated in Tables I and II. A description of the ex- <br />tent of flooding is discussed in the following paragraphs. <br />The flooding along the lower part of Clear Creek in Adams <br />County from the South Platte River to 1-25 is confined to the <br />lowlands and gravel pits between 1-76 and Colorado Highway 224. <br />No residential areas or commercial establishments, except for the <br />gravel mining operations, are threatened in this reach. Road <br />crossings in this reach include York Street, Washington Street, <br />the 1-76 to 1-25 access ramp and two 1-25 bridges. Each of these <br />crossings has a 100-year capacity. <br />In the reach between 1-25 and Federal Boulevard, the flood- <br />plain remains undeveloped except for the numerous gravel mining <br />operations. Water topping Pecos Street south of West 64th Avenue <br />will enter a large pit and probably be confined to this area. A <br />possible overflow area is shown on the Flood Hazard Area Delinea- <br />tion maps (Sheet 4) to indicate an area which may be flooded if <br />the flood peak is sufficiently long to fill the pit. The major <br />crossings in this reach include Broadway; Pecos Street, the Colorado <br />and Southern Railroad, and Federal Boulevard. These stream cross- <br />ings all have spill across the roadway or railroad tracks during <br />a 100-year event. <br />The remaining reach in Adams County between Federal Boulevard and <br />Sheridan Boulevard consists of a wide floodplain with low velocities. <br />Backwater behind the Denver and Rio Grande Western Railroad will <br />overtop Federal Boulevard and pond in the area east of Federal <br />Boulevard to an elevation of 5214.0 feet m.s.l. A small amount <br />of water would flow down Federal Boulevard and spill to the east <br />before reaching Clear Creek. An area of shallow flooding has been <br />indicated on the Flood Hazard Area Delineation maps. A number of <br /> <br />-6- <br />
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