Moderate

ZIP Code 59345

Custer County, Montana

30PSF (Ground Snow Load)
ModerateClassification

What This Means

Custer County, Montana has a moderate ground snow load of 30 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 Code59345
CountyCuster
City—
StateMontana (MT)
Ground Snow Load30 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): 30 PSF

Roof Snow Load: 21 PSF

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

Custer 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

59343 30 PSF Moderate 59344 30 PSF Moderate 59347 25 PSF Moderate 59348 10 PSF Light

Frequently Asked Questions

What is the ground snow load for ZIP code 59345?

ZIP code 59345 is in Custer County, Montana, with a ground snow load of 30 PSF, classified as moderate per ASCE 7-22.

Is my roof strong enough for snow in 59345?

With a moderate ground snow load of 30 PSF, standard residential construction typically handles this load, but verify with your local building code.

What county is ZIP code 59345 in?

ZIP code 59345 is in Custer County, Montana (MT).