Tillman County, OK Roof Snow Load - 10 psf
Tillman County, OK: your roof's ASCE 7 snow number, in plain English
Tillman County's roofs are built to hold 10 psf of snow, the ASCE 7-22 figure a permit reviewer checks first. Flat and low-pitch roofs in Tillman County are actually governed by ASCE 7's §7.3.4 minimum of 10 psf, not the 7 psf the ground-load formula alone would produce.
In depth, not weight: that's roughly 22 inches of fresh, light snow, 8 inches of old, settled snow, or as little as 2 inches of solid ice - snow that heavy is rare here but ice from a freeze-thaw cycle adds up far faster than the depth suggests. A modest addition to standard roof loading. Ordinary residential construction handles this without extra bracing.
Tillman County in numbers
- Design roof snow load10 psf
- Ground snow load, ASCE 7 map10 psf
- National rank#2,032 of 2,758
- Oklahoma rank#67 of 77
- Population6,736
- Annual snowfall, NOAA normal0.8 in.
- FIPS40141
Tillman County by the numbers
Nationally that's #2,032 out of 2,758 rated counties, the top 74%; within Oklahoma alone, Tillman County ranks #67 of 77. 11 psf is Oklahoma's typical county figure - Tillman County comes in 1 psf under it.
Tillman County, FIPS 40141, is home to 6,736 people near 34.3711°N 98.9317°W. Its 10 psf ground snow load figure is the map value; 10 psf is what a roof is actually designed for.
Tillman County's snowfall, most winters
0.8 in. a year: that's Tillman County's NOAA 1991-2020 snowfall normal, measured at CHATTANOOGA, OK US (16.5 mi away). See the density guide.
Before you rely on Tillman County's number
Treat the Tillman County figure as a starting point, not a final answer: it assumes standard occupancy, a heated structure and a moderately sheltered site, per ASCE 7-22's own defaults. Exposed terrain, an unheated building or a steeper roof all shift the real number.
For a real application, skip the county number and go straight to the ASCE 7 Hazard Tool - enter your coordinates and it returns a site-specific figure a plan reviewer will recognize. (How this figure is calculated.)