FLOOD10395

• County: Larimer
• Community: Wellington
• Stream Name: Boxelder Creek
• Basin: South Platte
• Title: Floodplain Management Study - Boxelder Creek in the Vicinity of the town of Wellington in Larimer County - Supplement No. 1 to the Plan of Work
• Date: 3/1/1982
• Floodplain - Doc Type: Floodplain Report/Masterplan

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INI'RODUCTION

This report evaluates the flood potential along Boxelder Creek from a
point about 12 miles northwest pf Wellington to its point of confluence
with the Cache La Poudre River, southeast of Fort Collins, Larimer
Colmty, Colorado. The evaluation was made wxler present conditions and
future conditions with the proposed five floodwater retarding structures
and one grade stabilizer installed. The proposed structural program
was developed by the Soil Conservation Service wxler the authority of
Public Law 566 Revised. This report is made for the Colorado Water Con-
servation Board to promote the best utilization of the land subject to
overflow. This report is based on historical information, data devel-
oped by use of the computer, and data developed manually using computer
output and other technical data.

This report contains maps, water surface profiles, flood plain cross
section locations, and elevations at all cross sections. Flood risks
my be appraised and the construction of facilities planned to reduce
flood damage. 'Although the flood plain near Fort Collins is not devel-
oped, at this time, it is expected to be urbanized in the near future.
The possibility of a lOO-year flood frequency stonn runoff or greater
occurring definitely exists, and it is important that the probability
of such a flood be anticipated in the planning of flood plain developnent.

SlMtARY OF FLOODS

The portion of Boxelder Creek flood plain that is considered in this
report extends about 23 miles above its JOOuth. Flooding occurs through-
out the flood plain in varying degrees. Local res idents outlined areas
of flooding that have occurred in the past, and flooding occurs on an
average of once every two years. There is no official gaging station
in the, watershed and no known flood flows have been measured.

GENERAL CONDITIOOS AND PAST FLOODS

A map of areas flooded as recalled by local residents is on file with
the Soil Conservation Service, Watershed Planning Staff office. The
mp, technical data and statements from local people obtained in the
field support the high frequency of flooding throughout the flood plain.
ÆThe Town of Wellington is subject to flooding from a combination of
flow from Boxelder Creek and Coal Creek, and there is a good probability
of a mjor stonn causing extensive flooding in Wellington. The area on
either side of Interstate Highway 25 and south of State Highway 14 is
subject to flooding. This area is agricultural now, but is planned for