Flagpole installation acrossIllinois

Flagpoles in Illinois

Loop towers, county seats on the rivers, campus grounds and mile after mile of warehouse frontage along the interstates.

Wind here. Illinois runs nearly four hundred miles from the Wisconsin line to the Ohio River, and the wind map does not move across any of it. Eder's chart puts the whole state at 90 mph, Chicago included; the city writes its own figure into its own construction code, which an engineer checks at permit. The map is therefore not what decides a pole here. Exposure is: a street between Loop towers and a school on the edge of a bean field carry the same number on paper and behave nothing alike. Below ground it is frost and water, because the footing has to go under the frost line and Chicago puts that at 42 inches. There is no single statewide building code either. Each town adopts its own, and since January 2025 the state requires that to be a model code from the last ten years, so the edition your permit is written against changes from one county line to the next.

• Chicago and the lakefront — Eder's map says 90 mph here too, and it tells you less here than anywhere else in Illinois. Downtown the wind is bent by the buildings; on open lake frontage there is nothing to bend it. Both take wall thickness rather than height, and both take hardware that still works in February.
• The collar counties and the Fox Valley — Sheltered suburban ground, where a standard wall is normally right. Rock is what moves the price out here: this is old quarry country, and where the dolomite comes up shallow the hole is cut instead of drilled.
• The prairie counties — The same 90 mph, over ground with nothing in front of it for miles and no rock anywhere near the surface. Open exposure and a wet hole push the same way, so the wall and the footing grow while the height stays sensible.
• The river valleys and the south — From the bluffs above the Illinois River down to the Ohio. Valley floors are genuinely sheltered and bluff tops are not, so a site with a view is sized on its own rather than off a county figure.

Flying the Illinois flag? We sell it, sewn to the state's own design specification and sized to sit under the national flag on your pole. See the Illinois flag →

Need taller than 80 ft? We supply steel flagpoles from 100 to 150 ft, made in the USA, for car dealerships, truck stops and other big sites across Illinois. 100–150 ft flagpoles in Illinois →