Moderate

ZIP Code 59087

Petroleum County, Montana — Winnett

25PSF (Ground Snow Load)
ModerateClassification

What This Means

Petroleum County, Montana has a moderate ground snow load of 25 PSF per ASCE 7-22. This load requires proper structural consideration during design. Roof framing, trusses, and connections should be engineered for this snow load. Ensure adequate drainage to prevent ponding.

Snow Load Details

ZIP Code59087
CountyPetroleum
CityWinnett
StateMontana (MT)
Ground Snow Load25 PSF — Moderate
Classification Range21 - 40 PSF
Data QualityMeasured

Source: ASCE 7-22 ground snow load polygons via ArcGIS

Roof Snow Load Calculator

ASCE 7-22 flat roof formula:  pf = 0.7 × Ce × Ct × Is × pg

Your ground snow load (pg): 25 PSF

Roof Snow Load: 17.5 PSF

ⓘ Simplified estimate for flat roofs. Sloped roofs, drift zones, and unbalanced loads need additional calculations. Consult a structural engineer for final design.

Petroleum County Snow Load Map

Counties colored by snow load classification. Gray = No Load, Blue = Light, Amber = Moderate, Orange = Heavy, Red = Extreme, Purple = Case Study.

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Nearby ZIP Codes

59085 CS Case Study 59086 CS Case Study 59088 20 PSF Light 59089 20 PSF Light

Frequently Asked Questions

What is the ground snow load for ZIP code 59087?

ZIP code 59087 is in Petroleum County, Montana, with a ground snow load of 25 PSF, classified as moderate per ASCE 7-22.

Is my roof strong enough for snow in 59087?

With a moderate ground snow load of 25 PSF, standard residential construction typically handles this load, but verify with your local building code.

What county is ZIP code 59087 in?

ZIP code 59087 is in Petroleum County, Montana (MT).