INITIAL PUBLIC NOTICE
FLAGSTAFF URBAN TRAIL LOW-WATER CROSSING REPAIR
FLAGSTAFF, COCONINO COUNTY, ARIZONA
PDMC-PJ-09-AZ-2019-016
The U.S. Department of Homeland Security’s Federal Emergency Management Agency (FEMA) intends to provide federal financial assistance under the Pre-Disaster Mitigation (PDM) Grant program to the city of Flagstaff in Coconino County, Arizona, to provide protection to the Flagstaff Urban Trail System (FUTS) low-water crossing and downstream BNSF railroad culvert from post-fire flood damage. The proposed action would mitigate potential impacts from post-fire floodwaters by repairing and reinforcing the existing damaged riprap at the FUTS low-water crossing. 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 intent to carry out an action affecting a floodplain.
The purpose of the proposed action is to reduce the risk of flood damage at the FUTS low-water crossing. The proposed action consists of repairing the existing 6-inch riprap protection of the FUTS low-water crossing wing walls by replacing missing riprap and reinforcing it with concrete or grout. The concrete or grouted riprap would be designed to pass a 3,000 cubic feet per second (cfs) flood that could potentially occur at this location as predicted by the Museum Fire flow models for the post-fire watershed conditions. The project would not expand the footprint of the previously constructed riprap. Equipment would be stored on previously disturbed ground outside of the floodplain.
The project area is in the 100-year floodplain as depicted on the FEMA Flood Insurance Rate Map (FIRM) Number 04005C6828G, effective date September 10, 2010. The FIRM shows that the project area lies within Zone AE, an area that has a 1-percent probability of flooding every year and where predicted floodwater elevations have been established.
Additional information about FEMA’s proposed action, including maps showing the potential impacts on floodplains, may be obtained 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 within 15 days after publication of this notice.