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Sweetwater County, Wyoming Pierotto Diversion Structure 2,200 sq. - - PowerPoint PPT Presentation
Sweetwater County, Wyoming Pierotto Diversion Structure 2,200 sq. - - PowerPoint PPT Presentation
Sweetwater County, Wyoming Pierotto Diversion Structure 2,200 sq. miles Largest Ephemeral Drainage in U.S. 830 sq. miles 1370 sq. miles After a long and useful service, it is time to retire the Pierotto Diversion Structure. It has held
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2,200 sq. miles Largest Ephemeral Drainage in U.S.
830 sq. miles 1370 sq. miles
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After a long and useful service, it is time to retire the Pierotto Diversion Structure.
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It has held back the energy of uncounted high flows.
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Now, it is failing.
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Drop Structure Above Native Undisturbed Eroded Downstream Upstream Undisturbed
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“Gullying and erosion of Bitter Creek would be much worse if it were not for the diversion structure for Pierotto Ditch ….” “…just upstream from the diversion … appears to be in danger of washing out. If this
- ccurs, a head cut will
erode back up the
- stream. This could
further damage the watershed, as well as the (railroad) and (bridges).”
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Endangered Species Rock Springs Flood Plain Rail Road Tracks Roadways Weeds Coal Mine Flaming Gorge Grazing
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About ½ Mile
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About 50 ft.
U.P. Railroad
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1999 2013
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- Do Nothing
- Replace Structure (Same Location)
- New Structure (New Location)
- ?
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Proposed new drop structure Failing Drop Structure
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