Vote: approved

Item Text

F-5. SUPPLEMENTAL WATERSHED AGREEMENT NO. 3 FOR THE SPOOKHILL FLOOD RETARDING STRUCTURE REHABILITATION PROJECT Approve the Supplemental Watershed Agreement No. 3 for the Supplemental Watershed Plan for the Buckhorn-Mesa Watershed which is inclusive of the Spook Hill Flood Retarding Structure (FRS). Supplemental Watershed Agreement No. 3 identifies that Spook Hill FRS has been rehabilitated, with a new 100-year life commencing June 25, 2009. A Watershed Agreement is required by the Natural Resources Conservation Service (NRCS) project authorization process at the end of the planning phase of dam rehabilitation projects. The Watershed Agreement is an agreement between NRCS and the District for the specific dam rehabilitation alternative selected for final design and construction. The Watershed Agreement is not, however, a cost share agreement. The Supplemental Watershed Plan outlines the project costs and benefits as well as the measures that differ from the original Watershed Plan. Several non-emergency dam safety deficiencies were identified at Spook Hill FRS and the District, in conjunction with the Arizona Department of Transportation (ADOT), completed studies during the design of the Red Mountain Freeway (State Route 202) which analyzed modification to correct the deficiencies, maintain the flood control benefits to downstream properties, and comply with state dam safety requirements. The engineering design for the modifications was reviewed and approved by NRCS in 2006 and construction of the modifications was completed in 2009. This item impacts Supervisorial District 2. (C-69-12-025-3-00)