FLOOD04800

• County: El Paso
• Community: Colorado Springs
• Stream Name: Cottonwood Creek
• Basin: Arkansas
• Title: Engineering Study of Cottonwood Creek Drainage Basin
• Date: 8/7/1979
• Prepared For: Colorado Springs
• Prepared By: Lincoln Devore
• Floodplain - Doc Type: Floodplain Report/Masterplan

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many, if not most, of the culverts beneath road sections are under-

sized, COQbined with some areas of high road embankments, these

points become dams, in effect, This effect was considered in the

flow of the upper basin by increasing the time of peak flow slightly,

The stockponds will generally not affect the flow except by slight

increase in the length of time to peak, For the purposes of this

study, these stockponds were assumed to be at spillway level at

the beginning of the storm,

The western (closely studied) portion

of the basin contains a number of structures, both major and minor,

These are of variable age, with the oldest being the masonry arches

along the old A, T, & S, F, Railroad right of way, West of the

Woodmen Road bridge noted above, the first major structure along

Cottonwood Creek is a large box culvert structure at Academy Boule-

vard. This structure is too small and should be increased in size,

West of this, a series of three structures exists, The first is

the old railroad arch; the second is a 1930 style concrete bridge

on Old Highway 85-87; the third is a double bridge concrete struc-

ture at Interstate 25, The open area for the channel is adequate

in all three cases, The concrete apron beneath the bridge on the

Interstate 25 is being eroded and should be repaired.

The south Sub-basin 23 contains a

number of existing drainage structures--most of which are recent.

A 5 by 10 concrete box exists at Tuckerman Street, at the end of

a mid-sized concrete lined ditch, This box is slightly too small

but is best corrected by improving the inlet and increasing the

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