Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

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Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment Arizona Congressional Representatives at Time of Plan Development: Senate: John McCain, U.S. Senator 241 Russell Senate Office Building Washington, D.C. 20510 (202) 224-2235 Jeff Flake, U.S. Senator B85 Russell Senate Office Building Washington, DC 20515 (202) 224-4521 House of Representatives: David Schweikert, U.S. Congressman 1205 Longworth House Office Building Washington, D.C. 20510 (202) 255-2190 USDA- NRCS Page i January 2013 Kimley-Horn and Associates, Inc.
Powerline Flood Retarding Structure Pinal County, AZ Draft Supplemental Watershed Plan and Environmental Assessment Draft Supplemental Watershed Plan and Environmental Assessment for the Powerline Flood Retarding Structure Pinal County, Arizona Prepared by: East Maricopa Natural Resource Conservation District and Flood Control District of Maricopa County 2801 W. Durango Street, Phoenix, Arizona 85009 Assisted by: United States Department of Agriculture Natural Resources Conservation Service AUTHORITY The original watershed work plan was prepared, and works of improvement have been installed, under the authority of the Watershed Protection and Flood Prevention Act of 1954 (Public Law 83-566) as amended. This Supplemental Watershed Plan and Environmental Assessment is authorized under Public Law 83-566 (as amended), and as further amended by Section 313 of Public Law 106-472 and in accordance with Section 102(2)c of the National Environmental Policy Act of 1969, Public Law 91-190, amended (42 USC 4321 et seq). ABSTRACT The Powerline Flood Retarding Structure (FRS) was constructed by the Soil Conservation Service (now the Natural Resources Conservation Service – NRCS) in 1968 as part of the Apache Junction-Gilbert Watershed Protection and Flood Prevention Project. The FRS is operated and maintained by the Flood Control District of Maricopa County (District). The 2.5 mile long, 21 foot high earth dam provides flood protection to downstream residents, structures, and infrastructure. The FRS has developed safety deficiencies and is approaching the original 50-year project lifetime. In May 2007, an earth fissure was identified in close proximity to the downstream toe of the dam. In light of the proximity of this earth fissure to the Powerline embankment, and the presence of other documented earth fissures in the general vicinity of the dam, the Arizona Department of Water Resources (ADWR) classifies Powerline FRS as being in an “unsafe, nonemergency, elevated risk” condition. As such, the Powerline FRS is one of ADWR’s highest priority unsafe dams in the state. The District is currently constructing the Powerline Interim Dam Safety Measure (IDSM). The IDSM consists of a new alignment for a portion of the Powerline FRS based on the results of past investigations indicating a high probability of an earth fissure beneath the existing embankment. In 2009, the District requested Federal planning and implementation assistance for long-term solutions to the identified dam safety deficiencies. This Supplemental Watershed Plan and Environmental Assessment (Plan/EA) determines the feasibility of decommissioning the FRS and replacing the FRS with a constructed channel to provide for continued flood protection while meeting current applicable local, State, and Federal regulations. COMMENTS AND INQUIRIES Comments and inquiries must be received by March 12, 2013. Submit comments and inquiries to: Keisha L. Tatem, State Conservationist, USDA, Natural Resources Conservation Service, 230 North First Avenue, Suite 509, Phoenix, Arizona, 85003 (Telephone: (602) 280-8801). The U.S. Department of Agriculture (USDA) prohibits discrimination against its customers. If you believe you experienced discrimination when obtaining services from USDA, participating in a USDA program, or participating in a program that receives financial assistance from USDA, you may file a complaint with USDA. Information about how to file a discrimination complaint is available from the Office of the Assistant Secretary for Civil Rights. USDA prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex (including gender identity and expression), marital status, familial status, parental status, religion, sexual orientation, political beliefs, genetic information, reprisal, or because all or part of an individual's income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) USDA- NRCS Page ii January 2013 Kimley-Horn and Associates, Inc.
Page 1: DRAFT SUPPLEMENTAL WATERSHED PLAN A
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Powerline Flood Retarding Structure
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Signal Butte Rd Meridian Rd Ironwoo
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POWERLINE FRS TYPICAL SECTION
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Figure 22 Figure 21 - Conceptual Mu
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Exhibit A-2 - Emergency Spillway Di
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Price Price Price Dobson Alma Schoo
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Powerline Plan and Environ. Assessment Jan. 2013 - Flood Control ...

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