Iowa County, WI Roof Snow Load - 21 psf
What ASCE 7 says about snow load in Iowa County
That's Iowa County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from.
Converted to something you can actually eyeball on a roof: about 46.2 in. of fresh powder, 16.8 in. once it settles and packs down, or just 4.2 in. if it's turned to ice. Modern-code homes carry a load like this without issue; an older addition, a carport, or any flat-roofed section is where it is worth checking first.
Iowa County, WI: quick facts
- Design roof snow load21 psf
- Ground snow load, ASCE 7 map30 psf
- National rank#453 of 2,758
- Wisconsin rank#69 of 72
- Population23,963
- Annual snowfall, NOAA normal41.1 in.
- FIPS55049
Where Iowa County's figure sits nationally
Out of 2,758 rated US counties, Iowa County sits at #453, the top 16% nationally - #69 of 72 within Wisconsin. 30.9 psf is Wisconsin's typical county figure - Iowa County comes in 9.9 psf under it.
Near 43.001°N 90.1337°W, FIPS 55049: Iowa County counts 23,963 residents and a 30 psf map value, which the code's own factors turn into 21 psf.
How much it actually snows in Iowa County
Most winters bring Iowa County roughly 41.1 in. of snow - NOAA's normal at DODGEVILLE WWTP, WI US, 2.9 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Iowa County's number above is ASCE 7-22's default case, not a custom calculation: ordinary residential occupancy, heated, sited on ground that's neither fully sheltered nor fully exposed. Any one of those changing - pitch, exposure, heating, occupancy - moves the real figure.
Nothing here substitutes for an address-level number. Get one free, in about a minute, from the ASCE 7 Hazard Tool using your own coordinates rather than Iowa County's county-wide figure. (How this figure is calculated.)