Heavy

ZIP Code 13621

St. Lawrence County, New York — Chase Mills

60PSF (Ground Snow Load)
HeavyClassification

What This Means

St. Lawrence County, New York has a heavy ground snow load of 60 PSF per ASCE 7-22. This is a significant structural load. Roofs must be specifically engineered for this snow load. Consider snow guards, proper insulation to prevent ice dams, and roof designs that shed snow effectively.

Snow Load Details

ZIP Code13621
CountySt. Lawrence
CityChase Mills
StateNew York (NY)
Ground Snow Load60 PSF — Heavy
Classification Range41 - 60 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): 60 PSF

Roof Snow Load: 42 PSF

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

St. Lawrence 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

13618 CS Case Study 13619 CS Case Study 13620 CS Case Study 13622 CS Case Study 13623 CS Case Study 13624 CS Case Study

Frequently Asked Questions

What is the ground snow load for ZIP code 13621?

ZIP code 13621 is in St. Lawrence County, New York, with a ground snow load of 60 PSF, classified as heavy per ASCE 7-22.

Is my roof strong enough for snow in 13621?

With a heavy ground snow load of 60 PSF, your roof must be specifically engineered for this load. Consult a structural engineer if building or renovating.

What county is ZIP code 13621 in?

ZIP code 13621 is in St. Lawrence County, New York (NY).