Floodplain Administration

City of Tucson Flood and Erosion Hazard Mitigation Projects (Being Updated)



 Project Status


Existing Conditions & Alternatives Reports completed. Alamo Wash report is being finalized this summer. Letter of Map Revision has been processed and information regarding flood limit changes have been mailed to affected residents. The adoption of this watershed management plan will go to Mayor & Council in winter 2020.

Arroyo Chico

Tucson Arroyo - Arroyo Chico Phase 2B Increment-  is nearing completion of design. High School Wash improvements will be completed as part of the Downtown Links Construction project. Work should begin August 2020.


El Con detention project identified as a key project. Feasibility study for potential projects in this watershed will begin soon with FEMA grant funding.

Flowing Wells Pima County Regional Flood Control District is studying Wilson Wash , Navajo Wash, and Bronx Wash on behalf of the City of Tucson.


Ruthrauff Basin Management Plan Approved by Mayor & Council Oct. 24, 2017. One of the approved alternative projects is underway near the Gardner Lane area.

Santa Cruz Santa Cruz River Management Plan Lower Santa Cruz River master planning underway. Silvercroft Watershed is being assessed for the Lower Santa Cruz master plan (by Pima County Regional Flood Control District). Floodwall for TEP substation feasibility study underway by FEMA, through a grant.


El Rio Golf Flood Mitigation Project - detention facilities are complete. Golf course sod repair in progress.


Tucson Floodplain Management Plan and Updated Floodplain Ordinance


Public Hearing for the Tucson Floodplain Management Plan 2020 Update, Floodplain Ordinance Revisions, and new Tucson Levee Manual

Five committee meetings have been held March through June of this year. In August 2020, two public meetings were held virtually to summarize the proposed changes. Recorded Public Meetings are provided below. The public meeting was held on Tuesday December 8, 2020. At the meeting the City of Tucson Mayor and Council adopted the three documents. 

In order to participate in the National Flood Insurance Program Community Rating System, the City of Tucson is obligated to periodically update the floodplain ordinance to reflect current procedures as well as any State and Federal regulations. Some of the changes include:

  •  "Critical facility" definition was updated to include new regulatory language as to the minimum elevation and access requirements for new or substantially improved requirements. The purpose of the update is to apply a more stringent requirement to the construction of these facilities.
  •  "Repetitive Loss Property" definition was added based on guidance from the National Flood Insurance Program and to increase opportunity for certain flood-loss claim benefits for City of Tucson property owners.
  • Development for placement and elevation of a building’s service equipment in relation to the regulatory flood elevation.
  • The minimum setback to the listed regional watercourses is proposed to be updated based on currently FEMA published and approved flood data. The option to reduce the stated erosion hazard setbacks for the corresponding regional watercourse can now only be processed through the variance process. The purpose of this requirement is to apply a higher level of scrutiny to new development where there is no, or insufficient, existing bank protection, and no bank improvements are proposed.
  • Tucson Flood, Stormwater and Erosion Hazard Management Code changes 

  • Tucson Floodplain Management Plan - 2020 Update 

  • Tucson Levee Manual 

  • Comments and Responses 

Monday, August 17 at 5:30 p.m. 


Tuesday, August 18 at Noon  

Tucson Flood or Erosion Questions?