Silver Bow County, MT Roof Snow Load - Case Study Area
Silver Bow County, MT: no map figure, on purpose
ASCE 7's own snow load map has no single figure for Silver Bow 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 30093, population 36,134. 386 US counties get this same case-study treatment; Silver Bow County is one of them.
Silver Bow County in numbers
- Population36,134
- Annual snowfall, NOAA normal11.2 in.
- FIPS30093
Silver Bow County's snowfall, most winters
11.2 in. a year: that's Silver Bow County's NOAA 1991-2020 snowfall normal, measured at DILLON U OF MONTANA WESTERN, MT US (47.5 mi away). 47.5 mi is a real gap between Silver Bow County and its nearest reporting station, so local snowfall can diverge from this figure, especially near elevation changes. See the density guide.
Before you rely on Silver Bow County's number
Treat the Silver Bow 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. Details: the calculation guide.