Feel like taking a quick walk across the lake? Ice skating? First, check the ice thickness...
Ice thickness Permissable load
2 inches one person on foot
3 inches group in single file
7.5 inches passenger car (2-ton gross)
8 inches light truck(2.5-ton gross)
10 inches medium truck (3.5-ton gross)
12 inches heavy truck (8-ton gross)
15 inches 10 tons
20 inches 25 tons
30 inches 70 tons
36 inches 110 tons
Source: "The Old Farmer's Almanac" (http://www.almanac.com/edpicks/safeicethickness.html)
(It then adds: "[Calculated for] solid clear blue/black and lake ice.
Slush ice has only half the strength of blue ice.
Strenghth value of river ice is 15 percent less.")
Oh, and be careful... just because the ice is thick enough in one region of the lake, doesn't mean it's the same anywhere else. Falling in a frozen lake is dangerous, damn it! If you catch hypothermia, and die... | 
