Portage County, WI Fence Regulations: Retaining Walls (2026)

Portage County Code § 7.7.4(1)(a)5.d, part of the Setbacks, Fences, Exempt and Floodplain Structures article of the shoreland zoning ordinance, lists what a landowner may place inside a required yard or highway setback without violating the setback line: broadcast dish antennas, utility lines and pumping stations, stairs and driveways, and, at item (d), 'fences, signs, landscaping features, retaining walls and propane storage tanks.' The county attaches no separate maximum height, engineering-certification, or standalone permit requirement to a retaining wall in this section; it is simply grouped with other minor yard improvements the ordinance treats as compatible with the setback's purpose.

That does not remove a retaining wall from the county's general construction oversight: any structure built in unincorporated Portage County, including one erected within a shoreland setback, still needs the zoning permit § 7.1.6(2)(a)2.a requires countywide before work starts, and a wall functioning as fill or grading tied to a subdivision would separately trigger the storm water and erosion-control review of § 7.4.6(4) if it affects drainage. Elsewhere the code allows retaining walls used to support ground at or below its natural level to stand inside the vision clearance triangle at road intersections under § 7.1.6(6)(b)1.c, without the height cap that applies to fences and plantings there, treating a retaining wall throughout the code as a grading feature rather than an obstruction, which is why it never gets its own height table.

Landowners near the ordinary high-water mark should still confirm with the Planning and Zoning Department whether a proposed wall counts as grading or fill requiring review under the shoreland vegetation or impervious-surface standards of §§ 7.7.6 and 7.7.7.