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<br />1.3 Authority and Acknowledgments
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<br />The source of authority for this Flood Insurance Study is the
<br />National Flood Insurance Act of 1968, as amended.
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<br />The hydrologic and hydraulic analyses for this study were performed
<br />by Gingery Associates, Inc., for the Federal Insurance Administra-
<br />tion, under Contract No. H3716. This work, which was completed in
<br />August 1976, covered all flooding sources affecting the unincor-
<br />porated areas of Adams County, Colorado. Approximate flood boundaries
<br />for standing bodies of water greater than 25 acres were arbitrarily
<br />determined in February 1977, by Dames & Moore, under contract to the
<br />Federal Insurance Administration.
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<br />2.0 AREA STUDIED
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<br />2.1 Scope of Study
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<br />This Flood Insurance Study covers the unincorporated areas of Adams
<br />County, Colorado. Excluded from this study are the incorporated
<br />Cities of Broomfield, Brighton, Westminster, Thornton, Arvada,
<br />Northglenn, Aurora, and Commerce City; the Towns of Federal Heights
<br />and Bennett; and the Rocky Mountain Arsenal. The area of study is
<br />shown on the Vicinity Map (Figure 1).
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<br />Floods caused by the overflow of the South Platte River, Big Dry
<br />Creek, Little Dry Creek, Little Comanche Creek, Niver Creek, North-
<br />field Creek, and portions of Box Elder Creek and Comanche Creek were
<br />studied in detail.
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<br />Streams studied using approximate methods include First, Second, and
<br />Third Creeks, West Box Elder Creek, Kiowa Creek, Wolf Creek, West
<br />Bijou Creek, Middle Bijou Creek, East Bijou Creek, Muddy Creek,
<br />Brantner Gulch, Grange Hall Creek, Todd Creek, Lost Creek, and
<br />portions of Box Elder Creek, Wolf Creek, and Comanche Creek. Clear
<br />Creek, originally studied in detail, has been mapped as an approxi-
<br />mate study area pending revision of elevations and delineations.
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<br />In general, areas that are developed
<br />through 1981 were studied in detail.
<br />studied by approximate methods.
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<br />or are expected to be developed
<br />The remaining areas w~re
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<br />2..2 Community Description
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<br />Adams County is located in central Colorado, just north and east of
<br />Denver, the state capital. The general shape of the physical boundary ~
<br />resembles a rectangle that is 18 miles wide by 72 miles long.
<br />Extending from near the foothills of the Rocky Mountains easterly to
<br />the open plains of the state, Adams County covers approximately 1240 .
<br />square miles. It is bordered on the north by Morgan and Weld Counties,
<br />on the east by Washington County, on the south by Arapahoe and ~
<br />Denver Counties, and on the west by Jefferson and Boulder Counties.
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