Lyman County, SD Roof Snow Load - 24.5 psf
What ASCE 7 says about snow load in Lyman County
That's Lyman 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 53.9 in. of fresh powder, 19.6 in. once it settles and packs down, or just 4.9 in. if it's turned to ice. A meaningful design load. Most homes built to modern code handle it, but additions, carports, and flat-roofed sections are worth a second look.
Got real snow on a Lyman County roof right now?
Lyman County in numbers
- Design roof snow load24.5 psf
- Ground snow load, ASCE 7 map35 psf
- National rank#368 of 2,758
- South Dakota rank#50 of 65
- Population3,721
- Annual snowfall, NOAA normal39.6 in.
- FIPS46085
Where Lyman County's figure sits nationally
Out of 2,758 rated US counties, Lyman County sits at #368, the top 13% nationally - #50 of 65 within South Dakota. 28.2 psf is South Dakota's typical county figure - Lyman County comes in 3.7 psf under it.
Near 43.8948°N 99.8419°W, FIPS 46085: Lyman County counts 3,721 residents and a 35 psf map value, which the code's own factors turn into 24.5 psf.
How much it actually snows in Lyman County
Most winters bring Lyman County roughly 39.6 in. of snow - NOAA's normal at KENNEBEC, SD US, 1 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Lyman 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 Lyman County's county-wide figure. See the methodology guide.