FLOOD06979

• Designation Number: 373
• County: Clear Creek
• Community: Georgetown
• Basin: South Platte
• Title: Flood Insurance Study - Georgetown, CO, Clear Creek County
• Date: 6/1/1989
• Designation Date: 9/1/1994
• Floodplain - Doc Type: Floodplain Report/Masterplan

The headwaters of South Clear Creek basin are located near the
Continental Divide with the highest point in the basin at
13,850 feet NGVD (Mount Edwards). South Clear Creek flows
northerly from its headwaters to its confluence with Clear Creek
within the Georgetown corporate limits. South Clear Creek has one
major tributary, Leavenworth Creek, which meets South Clear Creek
approximately one mile upstream from Georgetown I s upstream
corporate limit.

The temperature in Georgetown varies considerably, with an average
monthly low of -26oF in January and an average monthly high of
920F during June and July. Winters are long and cold with mean
daily temperatures near 300F from November to March. The normal
average precipitation in the area is approximately 16 inches
(Reference 2).

2.3 Principal Flood Problema

Major flooding has occurred throughout the area studied by
detailed methods in Georgetown. A flood occurred along Clear
Creek at Roae and 10th Streets on June 9, 1864. A levee was
constructed the following day to keep the stream within its limit
(Reference 3). This levee is no longer in existence. Another
flood occurred following three days of heavy rainfall ending on
July 23, 1965, when water spilled out of its bank at three
locations along South Clear Creek and an area from Main to Rose
and 8th and 11th Streets was inundated (Reference 3). A snowmelt
flood occurred along Clear and South Clear Creeks in June 1983.

Flooding in Georgetown
snowmelt or snowmelt in
to the usual pattern of
hailstorms occasionally
paths and create some
mentioned date.

is primarily caused by either spring
conjunction with rainfall. An exception
flooding occurred on July 23, 1965. Heavy
cause drifts of hail that' block drainage
flooding, which occurred on the afore-

2.4 Flood Protection Measures

There are no existing flood control structures in the study area
which could reduce the present flood hazard.

3.0 ENGINEERING METHODS

For the flooding sources studied by detailed methods in the community,
standard hydrologic and hydraulic study methods were used to determine
the flood hazard data required for this study. Flood events of a
magnitude which are expected to he equaled or exceeded once on the
average during any 10-, 50-, 100-, and 500-year floods, have a 10-, 2-,

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