Eagle Mountain, UT Environmental Rules: Flood Elevation Requirements (2026)

Eagle Mountain does not set a blanket freeboard number in Chapter 15.105 EMMC, but it does require elevation documentation and disclosure tied to the base flood elevation. Under EMMC 15.105.030(C)(1), an application for a building permit goes to the floodplain administrator, the city building official under EMMC 15.105.030(A), with plans showing the location, dimensions, and elevation of proposed structures and any landscape alterations relative to the area of special flood hazard. When requested, the applicant must provide the elevation, in relation to mean sea level, of the lowest floor, including any basement, of all new and substantially improved structures, the elevation to which any nonresidential structure will be flood-proofed, and a registered engineer's or architect's certificate that a flood-proofed nonresidential structure meets the standards in EMMC 15.105.050.

The base flood elevation becomes decisive when a property owner seeks a variance. EMMC 15.105.040 lets the planning commission, sitting as the appeal board, grant variances from the chapter's requirements, but EMMC 15.105.040(J)(3) requires that any applicant who receives a variance get written notice that the structure will be permitted with its lowest floor elevation below the base flood elevation, and that flood insurance will cost more because of that added risk. Variances for a lot of one-half acre or less surrounded by existing below-base-flood structures are available under EMMC 15.105.040(F), but the appeal board cannot issue a variance within a mapped floodway if it would raise flood levels during the base flood, per EMMC 15.105.040(H).