Projects

Project Name: Powerline/Vineyard Road/Rittenhouse FRS Rehab

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Project Manager: Mel Bunkers
Contact by phone at (602) 506-4602 or by email

Project is in Supervisor District:

• District 1: True
• District 2: False
• District 3: False
• District 4: False
• District 5: False

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Project Type: Engineering/Design

Project Description:

Powerline, Vineyard Road and Rittenhouse (PVR) Flood Retarding Structures (FRSs) are located in northwest Pinal County (south of Apache Junction and parallel to the Central Arizona Project (CAP) canal between Baseline Road and Ocotillo Road). The primary function of these structures is to provide flood protection for the downstream benefitted area and to reduce the risk of loss of life and property due to catastrophic dam failure. The three FRSs protect approximately 72 square miles of residential, commercial, and agricultural land in Maricopa and Pinal counties from being flooded.  Including the CAP canal, Phoenix-Mesa Gateway Airport, ASU Polytechnic Campus and the Loop 202 Santan Freeway.  

The PVR FRSs are classified as "high hazard potential structures” which signifies that they protect substantial amounts of downstream infrastructure and a large population.  In July 2002, the District prepared a Final Failure Mode Analysis (FFMA) Report, Structures Assessment Program Phase I that identified defects in the three structures due to the age, proximity to adjacent earth fissures, land subsidence of the area due to groundwater withdrawal, and cracking caused by drying shrinkage. The FFMA recommended rehabilitation of the structures which includes structural improvements to the dams or replacement of the dams with channels, basins or other flood control facilities. The District manages the three structures by agreement with the Natural Resources Conservation Service (NRCS).

The plan for the existing PVR dams is to replace Powerline FRS with Powerline Channel and to raise and rehabilitate Vineyard FRS and Rittenhouse FRS.  The Vineyard FRS must be rehabilitated prior to construction of Powerline Channel and rehabilitation of the Rittenhouse FRS. The Vineyard Rehabilitation Project is currently at the revised 100% design phase.  The Vineyard FRS construction start date is tentatively scheduled for late Fiscal Year 2025.

Last Updated: 7/30/2024 7:56:49 AM