FLOOD02072

• County: Logan
• Community: Logan County
• Stream Name: Pawnee Creek
• Title: Floodplain Management Study
• Date: 4/1/1992
• Prepared For: Logan County
• Prepared By: USDA Soil Conservation Service
• Floodplain - Doc Type: Floodplain Report/Masterplan

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The ~ike system would prevent flood flows from reaching the
Riverside Cemetery along with the associated overflow into
Sterling and across the highway and railroad in that vicinity.
An additional 2900 ef5, above present conditions, would be forced
through the Pawnee Creek highway and railroad bridges (100 yr).
Approximately 1400 cis would overflow the highway and railroad in
this vicinity that would not occur under present conditions.
There would be an increase in water surface elevation of about
3.1 tt at the Pawnee Creek bridge. An increase of 340 cis from
present conditions would overflow the highway and railroad near
Atwood. This would raise the water surface elevation across the
railroad near Atwood by very little.

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This dike system would benefit the Town of Sterling; however, it
should he understood that a tradeoff would be additional flood
water discharge and depth along the lower reach of Pawnee Creek
to Atwood.

Pawnee Creek Watershed - Oike System Cost

---------------------------------------------------------------
Location Volume Canst Eog proj Land Total 0'"
Fill Cost Cost Admin Right In"t",] il
c, $ $ $ $ $ $
---------------------------------------------------------------
l!
West Dike 14500 70300 9850 11950 12000 104100 ;00
V II
East Dike 15960 557040 78040 94790 12000 741870 6250
South Dike 3374 12680 1770 2150 5000 21600 '00
'1
Total 33834 640020 89660 108890 29000 867570 7150
---------------------------------------------------------------

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~I Includes $16000 for 4 irrigation conduits under the dike
,I Includes 15340 cu yd earthfill and 620 cu yd of reinforced
concrete
11 Includes $5800 for irrigation conduit, $435240 for concrete
wall and $58500 for special structure at highway and railroad
if O&M (annual cost assumed to be) 1 percent of construction cost
2f Includes 620 cu yd of reinforced concrete
Note: Rock rip rap may be needed along the downstream railroad
slope at certain locations. Costs for this are not included
here.

Further project studies will be needed to evaluate economic
feasibility and project effects if this dike system were to be
pursued.

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