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Wyoming Water Development Commission 
Harry C. LaBonde, Jr., PE, Director 
6920 Yellowtail Rd, Cheyenne, WY 82002 
Phone: 307-777-7626 

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103.PROJECT:Riverton Valley Rehabilitation #2, Phase II
SPONSOR:Riverton Valley Irrigation District
LOCATION:Fremont County

The Riverton Valley Irrigation District has been rehabilitating laterals to continue their conservation program as recommended in the WWDC Level I Report: Wind River Study: Leclair Canal and Riverton Valley (Wyoming No. 2 Canal Rehabilitation), March 1993. Most recently, a WWDC Level II study was just completed (Oct. 2001) which provided cost estimates and conceptual designs for piping the remaining laterals. The district is realizing a 25% increase in efficiency through such improvements.

The district has approached the Commission for continuation of the existing Level II to evaluate the rehabilitation needs and costs of four underflow structures that were not included in the previous Level I study. These 1930's vintage structures handle upstream return flow and flood flow and protect the canal from flood related erosion. The four crossings are in various states of disrepair, with Madden Draw being in the worst condition, as the underflow structure has already partially failed (caved in). Additionally, the corrugated metal pipe utilized at these crossings may not be sized correctly to handle extreme events. Rehabilitation of these crossings would provide protection to the canal during flood flows and ultimately improve the ability and reliability of the system to deliver water to the users.

The WWDC recommends that the project be incorporated in the Rehabilitation Program at Level II with an appropriation of $40,000.

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