Jefferson County, KS Roof Snow Load - 20 psf
How much snow is too much for a roof in Jefferson County, KS?
20 psf: that's what ASCE 7-22 requires a typical heated home's roof in Jefferson County to carry. ASCE 7's low-slope-roof minimum (§7.3.4) raises the governing figure to 20 psf - higher than the 14 psf the ground-load formula alone would give, and the code says use the larger one.
Picture it, not just weigh it: 44 in. if it's fresh powder, 16 in. once it settles, or a mere 4 in. if it's 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.
Jefferson County at a glance
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#979 of 2,758
- Kansas rank#18 of 105
- Population18,332
- Annual snowfall, NOAA normal16.4 in.
- FIPS20087
How Jefferson County compares
20 psf ranks #979 of 2,758 US counties with a mapped snow load (top 35%) - and #18 of 105 in Kansas. That's 1.8 psf above Kansas's own county-average design load of 18.2 psf.
Population 18,332 (FIPS 20087), roughly 39.2396°N 95.3753°W. The 20 psf ground snow load ASCE 7-22 maps here becomes 20 psf once the code's own design factors are applied.
Typical snowfall in Jefferson County, KS
NOAA's 30-year normal for Jefferson County: 16.4 in. of snow a year, from the OSKALOOSA 4 NE, KS US station. (fresh vs. packed vs. ice explains why.)
What this Jefferson County figure assumes
This is a county-level reference figure for a typical heated home built to Risk Category II (ordinary residential), on a partially exposed lot - the assumptions ASCE 7-22 itself treats as the default case. A steeper roof, a fully exposed hilltop lot, an unheated structure, or a higher risk category all change the actual number.
Jefferson County's permit office wants an address-specific figure, not this county average - the ASCE 7 Hazard Tool is free, takes under a minute, and outputs a PDF most reviewers accept. See the methodology guide.