Extreme

ZIP Code 49805

Keweenaw County, Michigan — Allouez

90PSF (Ground Snow Load)
ExtremeClassification

What This Means

Keweenaw County, Michigan has an extreme ground snow load of 90 PSF per ASCE 7-22. This requires robust structural engineering with heavy-duty framing. Snow removal plans, snow guards, and reinforced roof systems are essential. Consult a licensed structural engineer for any construction.

Snow Load Details

ZIP Code49805
CountyKeweenaw
CityAllouez
StateMichigan (MI)
Ground Snow Load90 PSF — Extreme
Classification Range61+ 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): 90 PSF

Roof Snow Load: 63 PSF

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

Keweenaw 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

49802 60 PSF Heavy 49806 70 PSF Extreme 49807 60 PSF Heavy 49808 70 PSF Extreme

Frequently Asked Questions

What is the ground snow load for ZIP code 49805?

ZIP code 49805 is in Keweenaw County, Michigan, with a ground snow load of 90 PSF, classified as extreme per ASCE 7-22.

Is my roof strong enough for snow in 49805?

With a extreme ground snow load of 90 PSF, your roof must be specifically engineered for this load. Consult a structural engineer if building or renovating.

What county is ZIP code 49805 in?

ZIP code 49805 is in Keweenaw County, Michigan (MI).