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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF FLOOD-PRONE AREAS
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<br />~ FORT COLLINS 25 M/
<br />~ BERTHOUO 5 MI, ! 492
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<br />The purpose of the flood-prone area maps' is to show to administrators, planners, and
<br />engineers concerned with future land developments those areas that are subject to flooding.
<br />The U.S. Geological Survey was requested by the 89th Congress to prepare these maps as
<br />expressed in House Document 465. The flood.prone areas have been delineated by the
<br />Geological Survey on the basis of readily available information.
<br />Flood-prone area maps were delineated for those areas that meet the following criteria:
<br />(1) Urban areas where the upstream drainage area exceeds 25 square miles, (2) rural areas
<br />in humid regions where the upstream drainage area exceeds 100 square miles, and (3) rural
<br />areas in semiarid regions where the upstream drainage area exceeds 250 square miles.
<br />The flood-prone areas shown on this map have a 1 in 100 chance on the avers4ce of being
<br />inundated during any year. Flood are.s have been delineated without consideration of
<br />present or future flood-control storage that may reduce flood levels.
<br />Flood-hazard reports provide the detailed flood information that is needed for economic
<br />studies, for formulating zoning regulations, and for setting design criteria to minimize
<br />future flood losses. When detailed information, such as that contained in the flood-hazard
<br />reports, is required, contact the U.S. Army, Corps of Engipeers; the U.S. Geological Survey;
<br />or the Tennessee Valley Authority in the areas of their jurisdiction. .
<br />
<br /> , SCALE 12 4000
<br /> , 0
<br />1000 0 1000 2000 3000 4000 500Il
<br />~ - -
<br /> 1 5 0
<br /> - - - - -
<br /> CONTOUR INTER VAL 10 FEET
<br /> DATUM IS MEAN SEA LEVEL
<br />
<br />1 MILE
<br />
<br />6000
<br />
<br />]OIXlFEET
<br />,
<br />
<br />EXPLANATION
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<br />
<br />QUADRANGLE LOCATION
<br />
<br />Flood boundaries were estimated from:
<br />Regional stage-frequency relations.
<br />
<br />, I_KILOMETER
<br />
<br />LONG MONT. COLO,
<br />
<br />Base by U.S. Geological Survey
<br />1968
<br />
<br />1970
<br />
<br />AMS 4964 II NE-SERIES VB77
<br />
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