Project Details

Powerline/Vineyard Road/Rittenhouse FRS Rehabilitation or Replacement

Public Meetings

Currently there are no public meetings scheduled for this project.

Past Public Meetings

• 2/12/2013
• 2/1/2011
• 11/4/2010
Project Contact: Felicia Terry
Region: SE
District: 1 - Denny Barney
Phase: Design & Engineering
Description:

The Powerline, Vineyard Road, and Rittenhouse (PVR) Flood Retarding Structures (FRS) 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. Per its agreements with the Soil Conservation Service (now Natural Resources Conservation Service, or NRCS), the District operates and maintains the structures. The FRS protect approximately 72 square miles of residential, commercial, and agricultural land in Maricopa and Pinal counties from being flooded, and protect structures such as the CAP canal, Phoenix-Mesa Gateway Airport, and the Loop 202 Santan Freeway.

The Arizona Department of Water Resources reclassified the PVR FRS as "high hazard potential structures” meaning they protect substantial amounts of infrastructure and a large population. In July 2002, the District prepared a Final Failure Mode Analysis Report, Structures Assessment Program Phase I (FFMA) that identified defects in the structures due to the age of the structures, proximity to earth fissures, land subsidence of the area, and cracking caused by drying shrinkage. The FFMA recommended rehabilitation of the structures which could include structural improvements to the dam or replacement of the dams with channels, basins or other flood control facilities.

A planning study was started in 2009 to evaluate alternatives for the rehabilitation of the structures. During the planning study, the alternative selected was to replace the Powerline FRS with a channel that flows into the Vineyard Road FRS floodpool, convert Rittenhouse FRS to a levee that discharges into Vineyard Road FRS floodpool, and then to raise and rehabilitate Vineyard Road FRS. However during the design phase, it was determined that the Rittenhouse Levee would not function properly so Rittenhouse FRS will remain a dam. Therefore, the selected design project is for the Powerline FRS to be replaced with a channel and the Vineyard Road and Rittenhouse FRSs raised and rehabilitated.

Status:

Due to funding from NRCS becoming available, the Powerline Channel and the Vineyard Road FRS raise and rehabilitation needs to be designed and constructed by September 30, 2018. The Vineyard Road FRS construction is a Construction Manager at Risk (CMAR) project. A CMAR has been contracted to help with the design and phasing of construction to complete the project by September 2018. The Powerline Channel will eventually be advertised as a bid, build project. Currently there is no funding for the rehabilitation of the Rittenhouse FRS construction. The design is underway for the Powerline Channel which should be completed by Summer of 2017. The Vineyard Road FRS Rehabilitation will be constructed in 3 phases. Phase 1 is currently being constructed and Ph. 2 is completing design.

The 5.5 mile long Vineyard Road FRS construction will involve an upstream filter, raising the embankment approximately 12 feet, new foundation, reconstruction of 2 earthen emergency spillways with concrete structures, and a new principal outlet.

Contact the Project Manager for additional information, Felicia Terry, P.E., CFM, 602-506-8111 or fet@mail.maricopa.gov

Available Documents

Document Name Type Size
2015-01 Powerline FRS Environmental Assessment - Final PDF 4.76 MB
2015-01 Project Fact Sheet PDF 3.55 MB
2015-01 Vineyard and Rittenhouse Environmental Assessment PDF 5.74 MB
Exhibit - Existing Conditions at Each FRS PDF 22.2 MB
Exhibit - Overall Project Area Map PDF 2.28 MB
Exhibit - Regional Context Map PDF 12 MB
Exhibit - Sample Alternative 1 PDF 1.87 MB
Exhibit - Sample Alternative 2 PDF 1.85 MB
Exhibit - Sample Alternative 3 PDF 1.84 MB
Exhibit - Site Analysis PDF 11.7 MB
Project Comment Sheet PDF 241 KB
Project Fact Sheet PDF 3.3 MB
Project Site Map PDF 2.06 MB
Public Meeting 1 Presentation - November 4, 2010 PDF 6.2 MB
Public Meeting 2 Presentation - February 1, 2011 PDF 1.6 MB
Public Meeting 2 Question & Answer Session PDF 228 KB
Public Meeting 3 Presentation - February 12, 2013 PDF 6 MB
Stakeholder Meeting 1 Minutes - August 26, 2010 PDF 61.2 KB
Stakeholder Meeting 1 Presentation - August 26, 2010 PDF 2.46 MB
Stakeholder Meeting 2 Minutes - September 13, 2010 PDF 478 KB
Stakeholder Meeting 2 Presentation - September 13, 2010 PDF 11.5 MB


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