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Project Name: White Tanks FRS No. 4 Rehabilitation


Project Manager: Dave Degerness
Contact by phone at (602) 506-4730 or by email

Project is in Supervisor District:

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

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Project Type: Engineering/Design

Project Description:

The Flood Control District of Maricopa County (District), in conjunction with the Natural Resources Conservation Service (NRCS), is in the process of rehabilitating White Tanks Flood Retarding Structure (FRS) No.4 to extend its useful life and maintain the flood control benefits to downstream property owners. The modified structure will provide a minimum of 100-year flood protection.

Phase 1 of the project replaced the existing central filter with an engineered filter meeting current design standards. A central filter is essentially a zone of sand material built into the dam in order to prevent the dam from failing due to embankment cracking.

Phase 2 of the project will extend the dam embankment to the north across Roosevelt Street to close off the left emergency spillway from operation. The right emergency spillway will be widened to accommodate the loss of the left emergency spillway. A west dam extension will also be constructed to contain the flood pool on the west side of the structure. The flood pool will be graded to remove the ADOT borrow pit and allow for positive drainage of the impoundment area. Two existing corrugated metal pipe (CMP) outlets will be removed or abandoned and a new Natural Resources Conservation Service (NRCS)-specification concrete riser will be constructed at the southeast corner of the dam. There will be two embankment repair sections and the height of the dam will also be increased for dam safety purposes.

When both phases are completed, the rehabilitated White Tanks FRS No.4 will meet or exceed all dam safety requirements for the Arizona Department of Water Resources (ADWR), the regulating agency for the design project.

Last Updated: 2/23/2021 1:45:21 PM

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