Fergus County, MT Roof Snow Load - Case Study Area
What "Case Study" means for Fergus County
ASCE 7's own snow load map has no single figure for Fergus County: the terrain is complex enough that the code (§7.2) requires an elevation-specific study rather than a county-wide value. That is the map being accurate, not a data gap.
FIPS 30027, population 11,862. 386 US counties get this same case-study treatment; Fergus County is one of them.
Fergus County, MT: quick facts
- Population11,862
- Annual snowfall, NOAA normal112.1 in.
- FIPS30027
Fergus County: average annual snowfall
Fergus County sees about 112.1 in. of snow most winters, per the LEWISTOWN 11 SSE, MT US station's 1991-2020 NOAA normal. See the density guide.
Read this before you use Fergus County's figure
The figure above assumes the case ASCE 7-22 treats as typical: a heated, ordinary-occupancy home on a partially exposed site. Change any of those - exposure, heating, roof pitch, occupancy category - and the real design number moves.
A building permit needs the number at your exact address, not the county average - the free ASCE 7 Hazard Tool returns that from your coordinates in about a minute and produces a PDF a plan reviewer will accept. Details: the calculation guide.