Kade MoncurFlood Control EngineerSalt Lake County Phone: (385) 468-6630Kathy HolderFloodplain ManagerState of Utah Phone: (801) 538-3332
Jamie HuffRiskMAP Program Manager State of Utah Phone: (801) 538-3752
Barbara FitzpatrickSenior Natural Hazards Program SpecialistFEMAPhone: (303) 235-4715
Municipal Services2001 South State Street N3 600Salt Lake City, UT 84114/ Email
Maps for Neff’s Creek Are Changing
The Utah Division of Emergency Management (DEM), the Federal Emergency Management Agency (FEMA) and Salt Lake County are working together to update flood maps for the Jordan Watershed, which includes Neff’s Creek, located in Millcreek Township’s Olympus Cove.
Working versions of the new flood maps can be viewed here. In 2017, FEMA will release a preliminary (draft) Flood Insurance Rate Map (FIRM) that will become effective in 2018 or 2019. The work maps provide updated flood risk information for Olympus Cove and designate the floodplain along Neff’s Creek as an active alluvial fan. An alluvial fan is
a fan-shaped area where rivers and streams deposit silt, sand, gravel, boulders and woody debris over time. Active alluvial fans are prone to sudden, unpredictable flood events.
On the new work maps, Olympus Cove is categorized using three different flood designations for active alluvial fans: Zone A (higher risk), Zone AO (moderate risk), and Shaded Zone X (lower risk). The Zone A areas, predominantly located highest (uphill) on the fan, could experience the highest water levels
(depths) and water speeds (velocities) during a flood. The Zone AO areas are defined by flooding with lower water depths and velocities. The Shaded Zone X areas have the lowest alluvial fan hazards. For properties in Zone A and Zone AO, the owners will be required to buy flood insurance when the FIRM becomes
effective in 2018 or 2019, if the structures are financed by federally backed mortgages. Although properties in the Shaded Zone X areas will not be subject to federal flood insurance requirements, flood insurance is strongly recommended for structures in these areas, as alluvial fan flooding is unpredictable.
In May 2016, representatives from DEM, FEMA and Salt Lake County hosted two community meetings for Olympus Cove residents to preview the draft work maps and learn about upcoming changes.
Please keep an eye on this website for details about future Olympus Cove community meetings, to be held in fall 2016. These meetings will address potential changes to insurance and building requirements for the area.
Please see the following fact sheets and Frequently Asked Questions:
Fact Sheet 1: Neffs Creek Flood Mapping Study: An Overview
Fact Sheet 2: What is an Alluvial Fan
Fact Sheet 3: An Introduction to Flood Risk
FAQs: FAQs Neffs Creek Flood Mapping Study
More information will be posted here as it becomes available. If you have any questions, please see the sidebar for contact information.
Last Updated: 12/28/16