Eagle Mountain, UT Fence Regulations: Retaining Walls (2026)

Eagle Mountain regulates retaining walls through Chapter 15.80 EMMC, Hillside Development Standards, and through the geotechnical submittal requirements in the building permit chapter, Chapter 16.60 EMMC. EMMC 15.80.050 is direct: retaining walls cannot be built over or adjacent to city utilities, and they cannot be placed inside a public utility easement at all unless the city engineer determines in writing that the wall will not unreasonably interfere with the easement. That written sign-off from the city engineer is the operative permission; without it, a wall inside an easement is not allowed.

Retaining walls also come up in the hillside chapter's slope rules. EMMC 15.80.020(C) requires a slope stability report, reviewed and approved by the city engineer, for any building within 200 feet of the edge of a slope of 25 percent or greater, precisely the terrain where retaining walls do the most work. That requirement carries into the building permit application itself: EMMC 16.60.040(A)(8) requires a geotechnical report, including a slope stability evaluation and a retaining wall design, whenever a proposed structure sits within 200 feet of a slope steeper than 25 percent or the lot's own grade exceeds 15 percent. The report must be wet-stamped by a Utah-licensed engineer.

EMMC 15.80.040 places the liability for protecting a property, its neighbors, and any watercourses or utilities on the owner or developer doing the work, not on the city, which is why the city engineer's review focuses on utility conflicts and slope safety rather than the wall's long-term performance. Eagle Mountain's hillside terrain in Cedar Valley, much of it graded for new subdivisions, makes retaining wall and slope stability checks a routine part of site plan review for the city's fast-growing residential developments.