Portage County, WI Fence Regulations: Height Limits (2026)

Portage County Code § 7.1.6(6)(b) creates a vision clearance triangle in each quadrant of every intersection of highways, streets, or railroad rights-of-way, measured back from the intersecting right-of-way lines by twice the setback distance required on the crossing road, or 100 feet from centerline for a railroad. Inside that triangle, § 7.1.6(6)(b)1.c bars any structure or object of natural growth from standing between two and one-half feet and ten feet above the street or curb grade, because anything in that band blocks a driver's sightline.

The same clause carves out narrow exceptions: tree trunks, posts no larger than six inches square, retaining walls that merely hold back ground at or below its natural grade, and wire fences may cross the height band, so long as none of them is placed or built so as to actually obstruct the view across the opening. A solid privacy fence, a berm, or dense plantings inside the triangle do not qualify for that exception and can be ordered removed. The Portage County Planning and Zoning Department, through the Zoning Administrator, reviews fence placement against this triangle when a zoning permit application shows the parcel sits on a corner lot, and the Board of Adjustment handles any request to vary the standard.

Because the triangle's size depends on the classification of the intersecting roads under § 7.1.6(6)(a), a fence that is legal on a Class 3 town road corner can still violate the rule where a state highway crosses a county road. Owners installing a fence near a road intersection in the towns should confirm both the right-of-way distances and the triangle geometry with the Department before building, since compliance is measured from the pavement or curb line, not the property line.