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<br />1,3 Authority and Acknowledgments
<br />
<br />The source of authority for this Flood Insurance Study is the
<br />National Flood Insurance Act of 196B,! as amended.
<br />
<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. H37l6. This work, which was completed in.
<br />August 1976, covered all flooding so~rces 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, .
<br />
<br />2.0 ~REA STUDIED
<br />
<br />2,1 Scope of Study
<br />
<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, Westm~nster, 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).'
<br />
<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.
<br />
<br />Streams studied using approximate methods include First, Second, and
<br />Third Creeks, West Box Elder Creek, ~iowa 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, pas been mapped as an approxi-
<br />mate study area pending revision of ejlevations and delineations.
<br />i
<br />
<br />In general, areas that are developed pr are expected to be developed
<br />through 19B1 were studied in detail. ! The remaining areas were
<br />studied by approximate methods.
<br />
<br />2.2 Community Description
<br />
<br />Adams County is located in central Colorado, just north and east of
<br />Denver, the state capital. The gene~al shape of the physical boundary
<br />resembles a rectangle that is 18 mile:s wide by 72 miles long.
<br />Extending from near the foothills of ;the Rocky Mountains easterly to
<br />,
<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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