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 back the energy of uncounted high flows.
Now, it is failing.
Drop Structure Above Native Undisturbed Eroded Downstream Upstream Undisturbed
“Gullying and erosion of “…just upstream from Bitter Creek would be the diversion … appears much worse if it were to be in danger of not for the diversion washing out. If this structure for Pierotto occurs, a head cut will Ditch ….” erode back up the stream. This could further damage the watershed, as well as the (railroad) and (bridges).”
Endangered Rock Springs Flood Plain Species Rail Road Roadways Tracks Weeds Coal Mine Flaming Grazing Gorge
About ½ Mile
U.P. Railroad About 50 ft .
1999 2013
• Do Nothing • Replace Structure (Same Location) • New Structure (New Location) • ?
Failing Drop Structure Proposed new drop structure
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