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FLOOD11712
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Last modified
1/26/2010 10:23:49 AM
Creation date
5/14/2008 12:23:17 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
354.12
County
Boulder
Community
Longmont
Basin
South Platte
Title
FIS - Longmont
Date
1/1/1977
Prepared For
Boulder County
Prepared By
FEMA
Floodplain - Doc Type
Historic FEMA Regulatory Floodplain Information
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<br />2.0 AREA STuDIED <br /> <br />2.1 Scope 0= Study <br /> <br />This Flood Insurance Study encompasses the limits of the <br />Prime Urbanized Area of the City of Longmont as described <br />in The St. Vrain Comprehensive Plan (Reference 1). The <br />area of the study is shown on the Vicinity Map <br />(Figure 1). <br /> <br />In addition to the St. Vrain Creek, the four tributary <br />streams included in this study are Dry Creek, Left Hand <br />Creek, Spring Gulch (The Slough), and Loomiller Basin. <br />Dry Creek, Spring Gulch, and Left Hand Creek originate <br />outside the Priffie Urbanized Area of Longmont in the Rocky <br />Mountain foothills and follow generally easterly courses <br />through the city. Spring Gulch consists of an improved <br />cha~nel which starts south of East 15th Avenue and con- <br />tinues as a concrete lined channel through Spring Gulch <br />Li~ear Park to 3rd Avenue, then down to the St. Vrain <br />Creek. The Loomi11er Basin is a depression oriented in <br />a northwest-southeast direction through the center of <br />Long~ont. Flood waters accumulate in the depression and <br />subsequently drain into Spring Gulch Basin near Third <br />Avenue and Atwood Street. A large portion of the area <br />within the Prime Urbanized Area limits and adjoining <br />the streams is fully developed. All of the defined <br />streams were chosen with consideration given to existing <br />hazards and forecasted development and construction <br />through 1980. <br /> <br />The limits of detailed study in the Prime Urbanized <br />Area City of Longmont were determined by the Federal <br />Emergency Xanagement Agency after consultation with the <br />co~~unity and the Study Contractor. In general, those <br />areas that are currently developed, or are expected to <br />be developed within the next 5 years, were studied by <br />detailed methods. <br /> <br />2.2 Co~~unity Description <br /> <br />The City of Longmont is located about 38 miles north of <br />Denver, the state capital. The recorded history of the <br />Longmont area dates back to the summer of 1820 when <br />Longmont's namesake, Major Stephen H. Long and his troop <br />of nineteen soldiers explored the St. Vrain Valley. <br />Prior to Long's arrival the Ute and Arapahoe Indians were <br />the valley's only inhabitants. In the 1830s fur trappers <br />came into the area and built numerous trading posts and <br />forts along the South Platte River east of Longmont. <br /> <br />3 <br />
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