Extreme

ZIP Code 99686

Chugach County, Alaska — Valdez

160PSF (Ground Snow Load)
ExtremeClassification

What This Means

Chugach County, Alaska has an extreme ground snow load of 160 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 Code99686
CountyChugach
CityValdez
StateAlaska (AK)
Ground Snow Load160 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): 160 PSF

Roof Snow Load: 112 PSF

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

Chugach County Snow Load Map

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

New Lookup

Check Another ZIP Code

Nearby ZIP Codes

99683 CS Case Study 99684 CS Case Study 99685 CS Case Study 99687 CS Case Study 99688 CS Case Study 99689 CS Case Study

Frequently Asked Questions

What is the ground snow load for ZIP code 99686?

ZIP code 99686 is in Chugach County, Alaska, with a ground snow load of 160 PSF, classified as extreme per ASCE 7-22.

Is my roof strong enough for snow in 99686?

With a extreme ground snow load of 160 PSF, your roof must be specifically engineered for this load. Consult a structural engineer if building or renovating.

What county is ZIP code 99686 in?

ZIP code 99686 is in Chugach County, Alaska (AK).