The ground snow load varies. Use the free snow load calculators at Jabacus (related link) to find the snow load for a specific location.
Snow load depends on geographic location, not on roof pitch. Most of Washington falls into the 25 psf snow load. Snoqualmie, for example, has a 50 psf snow load since it receives a higher amount of snow fall than an area such as Seattle. Your county building department can answer this question for your specific location and/or has a snow load map where you can look it up yourself.
From the USDA Forestry Division, they say the snow load for Missouri is 10-20psf. I would reccomend going with the higher of those
A 4-12 pitch with a 30lb snow load will hold approximately 6 feet of wet snow. If you went to a 40lb-snow load and kept the roof pitch at 4-12 your roof would be able to hold 8 feet of wet snow. We don't get that much dry powder in New England...:)
The Ground Snow Load for Portland Maine is 60 pounds per square foot. The answer was determined from the following reference which is published by the State of Maine: http://www.maine.gov/dps/bbcs/Maine%20GSL%20Listing%20by%20Town_1215.pdf.
Yes, the roof is a load bearing structure. Wind, rain and snow all apply loads to a roof. Snow loads can be very great in some portions of the country
need to call the state: (406) 841-2040
Single Wide = South 20psf
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It is a "LIVE LOAD" which is the weight of snow for which a roof is designed for. It is usually 40 lbs. per square foot. Al dead load is the weight of the roof structure itself.