Winnebago County, IA Roof Snow Load - 28 psf
What ASCE 7 says about snow load in Winnebago County
That's Winnebago 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 61.6 in. of fresh powder, 22.4 in. once it settles and packs down, or just 5.6 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.
Winnebago County at a glance
- Design roof snow load28 psf
- Ground snow load, ASCE 7 map40 psf
- National rank#263 of 2,758
- Iowa rank#5 of 99
- Population10,383
- Annual snowfall, NOAA normal38.1 in.
- FIPS19189
Where Winnebago County's figure sits nationally
Out of 2,758 rated US counties, Winnebago County sits at #263, the top 10% nationally - #5 of 99 within Iowa. That's 6.3 psf above Iowa's own county-average design load of 21.7 psf.
Near 43.3781°N 93.7435°W, FIPS 19189: Winnebago County counts 10,383 residents and a 40 psf map value, which the code's own factors turn into 28 psf.
How much it actually snows in Winnebago County
Most winters bring Winnebago County roughly 38.1 in. of snow - NOAA's normal at LAKE MILLS, IA US, 10.8 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Winnebago 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 Winnebago County's county-wide figure. Details: the calculation guide.