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Final Public Notice: Town of Snowflake, Northern Solution Flood Control Mitigation Project

Release date: 
July 3, 2018
Release Number: 
PDMC-PJ-09-AZ-2016-010

The U.S. Department of Homeland Security’s Federal Emergency Management Agency (FEMA) proposes to provide federal financial assistance under the Hazard Mitigation Grant Program, to the Town of Snowflake in Navajo County, Arizona, to mitigate against recurring flood damage along State Route 277 (proposed action). Pursuant to Executive Order 11988 (Floodplain Management) and FEMA’s implementing regulations at Title 44 of the Code of Federal Regulations Part 9, FEMA hereby provides interested parties with a notice of its final decision and an explanation of the alternatives that were considered.

The purpose of the proposed action is to reduce the impact of flood hazards along State Route 277 approximately 1.5 miles west of the intersection of State Route 277 and State Route 77, by adding new flood control features onto an existing undersized basin. The features consist of: 1) upstream drainage grading; 2) an overflow spillway added to the existing basin; 3) a channel to convey the overflow discharge; 4) a culvert crossing where the channel intersects the future expansion of Industrial Way; and 5) a channel terminus into an existing discharge basin.

The project area is depicted on the FEMA Flood Insurance Rate Map (FIRM), Map Number 04017C4038, effective date September 26, 2008. A portion of the proposed action lies within Zone A and Zone X, an area that has a 1-percent and 0.2-percent probability of flooding every year, respectively.
A map of the project area and its location within the floodplain is available for public inspection. Parties interested in receiving a copy of the map should contact the FEMA Region IX Environmental Officer using contact information provided in this notice.

Two alternatives to the proposed action were considered: Alternative 1, Increase Capacity of Existing Basin; and Alternative 2, No Action. Alternative 1 included levee structures to increase capacity of the basin, a pressurized pipe bored under the existing buildings to exit at the discharge basin. This Alternative is not recommended due to high costs, technical difficulties with the levee structures and additional ponding upstream, and impacts to Waters of the U.S.. Under Alternative 2, no improvements would be made, and the Town of Snowflake would continue to experience recurring flood damage. Therefore, before, Alternative 2 is not recommended. FEMA has determined that the proposed project is the only practicable alternative available; therefore, a portion of the proposed action must be located in the floodplain. The proposed action would have no significant adverse impact on the floodplain and would benefit the area by reducing the risk of flooding and flood damage. Therefore, measures to minimize impacts on the floodplain are not necessary. The Town of Snowflake has declared that the proposed action conforms to local floodplain standards, and is responsible for the management, construction, and maintenance of the proposed action.

Additional information about FEMA’s proposed action may be requested by writing the FEMA Region IX Environmental Officer at FEMA, 1111 Broadway, Suite 1200, Oakland, California 94607, or fema-rix-ehp-documents@fema.dhs.gov, or calling (510) 627-7027. All requests should be received no later than July 18, 2018.  No action will be taken before this date.

Last Updated: 
July 3, 2018 - 15:43