Watershed project will reduce flood risk south of Arizona Canal

A reduced threat of flooding and potential flood insurance savings are just two benefits of a project taking place within Scottsdale’s Granite Reef Watershed.

The watershed is generally between the Arizona Canal and the Salt River, Granite Reef Road and Pima Road.

Construction of new storm drains near 86th Street between Jackrabbit and Camelback roads began last October.  Construction of storm drains in Granite Reef Road and Heatherbrae Drive is anticipated to begin in summer 2018.  

The final design phase of new storm drains and detention basins south of Indian School Road is also anticipated to begin this summer. Upon completion, this project will provide 100-year flood protection to all, or nearly all, structures within the watershed.

Staff will apply for a revision to the existing FEMA 100-year floodplain from Thomas to McKellips roads generally along 87th Street and Granite Reef Road upon completion of this project the construction in the northern half of the watershed, between the Arizona Canal and Indian School Road. 

The city anticipates FEMA approval of the first application in the latter half of 2019. The city believes it will result in a much smaller floodplain and eliminate the mandatory flood insurance requirement for hundreds of property owners currently within the floodplain.  The second application will be made upon completion of the improvements south of Indian School Road. The existing FEMA floodplain is about two miles long and encompasses over 600 structures.

Learn more about this project.

 To learn more about the floodplain remapping process, contact Ashley Couch, floodplain administrator at 480-312-4317.


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