Putnam County, OH Roof Snow Load - 20 psf
What ASCE 7 says about snow load in Putnam County
That's Putnam County's design roof snow load per ASCE 7-22, for a typical heated single-family home - the number a permit reviewer starts from. Flat and low-pitch roofs in Putnam County are actually governed by ASCE 7's §7.3.4 minimum of 20 psf, not the 14 psf the ground-load formula alone would produce.
Converted to something you can actually eyeball on a roof: about 44 in. of fresh powder, 16 in. once it settles and packs down, or just 4 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.
Putnam County in numbers
- Design roof snow load20 psf
- Ground snow load, ASCE 7 map20 psf
- National rank#826 of 2,758
- Ohio rank#68 of 86
- Population34,206
- Annual snowfall, NOAA normal10.7 in.
- FIPS39137
Where Putnam County's figure sits nationally
Out of 2,758 rated US counties, Putnam County sits at #826, the top 30% nationally - #68 of 86 within Ohio. Putnam County's figure lands almost exactly on Ohio's own county-average of 20 psf.
Near 41.0245°N 84.1299°W, FIPS 39137: Putnam County counts 34,206 residents and a 20 psf map value, which the code's own factors turn into 20 psf.
How much it actually snows in Putnam County
Most winters bring Putnam County roughly 10.7 in. of snow - NOAA's normal at OTTAWA, OH US, 4 mi off. (fresh vs. packed vs. ice explains why.)
Read this before you rely on it
Putnam 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 Putnam County's county-wide figure. (How this figure is calculated.)