FLOOD05819

• County: Logan
• Community: Sterling
• Basin: South Platte
• Title: City of Sterling Drainage and Flood Control Implementation Plan
• Date: 6/1/1997
• Prepared For: Sterling
• Prepared By: ICON Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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storm events, flood waters overtop the banks of Pawnee Creek and flow into the City of Sterling.
Pawnee Creek has a large drainage basin with an area of approximately 645 square miles. The
drainage basin includes areas in both Logan and Weld Counties. This study includes the reach along
Pawnee Creek from its confluence with the South Platte River 100-year floodplain upstream to CR. 29,
a distance of about 7.5 miles.

Sand Creek is also a left bank tributary to the South Platte River. The Sand Creek watershed area
includes approximately 30 square miles in Logan County. Stormwater from Sand Creek drains west
through Pioneer Park just north of HWY 14 and into the City of Sterling where it is intercepted by the
Pioneer Ditch. The Pioneer Ditch eventually drains into the South Platte River, This study includes
the reach of Sand Creek from its confluence with the Pioneer Ditch upstream, through Pioneer Park to
approximately the Pawnee Ditch.

The Pioneer Ditch is a principle stormwater conveyance for the City of Sterling. The Ditch begins in
the southwest portion of the City of Sterling near Westview and Iris Drive. Generally, the Ditch drains
to the South Platte River along the western and northern edges of the City. The Pioneer Ditch serves as
a drainage conveyance for local flows, as well as the overflows from Pawnee Creek and for Sand Creek
and the Pioneer Park area. The existing conveyance system is in need of repair. This study includes
the reach of Pioneer Ditch from HWY 6 and the BNRR to its upstream limit. Figure 6 presents the
general locations of the streams included in this study.

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