Projects

Project Name: Mesa Zone D Flood Delineation Study

Project Manager: Kathryn Gross
Contact by phone at (602) 506-4837 or by email

Project is in Supervisor District:

District 1: False
District 2: True
District 3: False
District 4: False
District 5: False

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Project Type: Study

Project Description:

The study identifies current Special Flood Hazard Areas for a portion of the previously unstudied FEMA Zone D area in the City of Mesa.

The study area is approximately 26.1 square miles and is roughly bounded by The Central Arizona Project (CAP) Canal to the east, US 60 to the north, Ellsworth Road to the west and Williams Filed Road alignment to the south.

The study is divided into 3 phases. Most of the area is listed as Zone D floodplains and Flood Insurance Rate Map panels are not available. Once all three phases are approved by FEMA, FEMA will prepare and publish new FIRM panels reflecting the study results for all three phases.

Phase 1

Phase 1 studied the portion north of Elliot Road to the US 60, from Meridian Road on the east to Ellsworth Road on the west. The study area covers approximately 8.1 square miles.

FEMA has approved the proposed floodplain for the study. The District and City of Mesa are using the information as the best available data for floodplain management purposes until the floodplain is incorporated into the new FIRM panels.

Detailed information for study results can be viewed on the Proposed FEMA Floodplain Map for Mesa Zone D Phase 1.

Phase 2

The Phase 2 study area extends from Elliot Road on the north to Williams Field Road on the south and from the CAP Canal on the east to Signal Butte Road on the west, approximately 13.4 square miles.

The proposed floodplain is ready to submit to FEMA for their review. Impacted property owners will be notified of the floodplain changes for their properties.

Detailed information for study results can be viewed on the Proposed FEMA Floodplain Map for Mesa Zone D Phase 2.

Phase 3

The study is ongoing and in the data collection/modeling phase.

Last Updated: 6/24/2024 8:27:01 AM

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Project Updates

June 2024: Phase 2 Preliminary Results Available for Review
Posted On: 6/24/2024 8:27:01 AM

There are proposed changes to the current flood maps. They will be submitted to FEMA for review in June 2024.

Review these changes here.

The new mapping will include the following flood hazard zones:

Zone AE: An area with a detailed delineation of a floodplain and in which Base Flood Elevations have been determined. A Regulatory Floodway may be part of the delineation.
Zone X (shaded): Areas of 500-year flood; areas of 100-year flood with average depths of less than one foot or with drainage areas less than one square mile; and areas protected by levees from the 100-year flood.
Zone X (unshaded): Areas to be determined outside the 500-year floodplain.

June 2024: Phase 1 Proposed Floodplains Approved
Posted On: 6/24/2024 8:14:37 AM

Phase 1 proposed floodplains have been approved by FEMA and will be incorporated onto the FIRM once all phases are completed.

March 2022: Phase 1 Preliminary Results Available for Review
Posted On: 6/24/2024 8:10:14 AM

There are proposed changes to the current flood maps. They will be submitted to FEMA for review in March 2022.

Review these changes here: https://apps.fcd.maricopa.gov/fcdprojects/downloads/71_FCD%20Mesa%20Zone%20D%20Phase%201%20UnshadedX%20Reduced.pdf

The new mapping will include the following flood hazard zones:

Zone AE: An area with a detailed delineation of a floodplain and in which Base Flood Elevations have been determined. A Regulatory Floodway may be part of the delineation.
Zone AO: An area with Flood depths of one to three feet (usually sheet flow on sloping terrain); average flood depths have been determined. For areas of alluvial fan flooding, velocities may have also been determined.
Zone X (shaded): Areas of 500-year flood; areas of 100-year flood with average depths of less than one foot or with drainage areas less than one square mile; and areas protected by levees from the 100-year flood.
Zone X (unshaded): Areas to be determined outside the 500-year floodplain.

Public Meetings

There are no public meetings scheduled.

Project Documents

Document Name	Description	Document Type	Filesize	Posted On
Phase 1 Proposed FEMA Floodplain Map	Proposed FEMA Floodplain Map for Mesa Zone D Phase 1	PDF	7	6/24/2024 7:47:54 AM	View
Phase 2 Proposed FEMA Floodplain Map	Proposed FEMA Floodplain Map for Mesa Zone D Delineation Study Phase 2	PDF	6.5	6/24/2024 7:49:01 AM	View