Here is a neat interactive sight http://www.fas.org/programs/ssp/nukes/nuclear_weapon_effects/nuclearwpneffctcalc.html?formAction=297&contentId=367

I figure the average bomb for them would be about 50 kilotons, maybe 100 kilotons.

Then an average city almost like Cincinnati. The 50 kiloton wipes out more than half, so 2 should be good.

They probally also had some megaton bombs, but far less than what was made in real life, maybe the largest was 5 megaton. The simulator goes to 4, but 4 wipes out any city. The only cities that could take a 4 megaton bomb and be ok is LA, Chicago, probally New York, and probally Houston.

If the game goes by the mechanics then that bomb in Megaton was a kiloton bomb, that sounds confusing...

The explosion was really tiny.

Lore wise I figure Megaton is a bit bigger, and the springvale is a little further away. But the destruction was very minimal.

EDIT: lol, I thought you were saying the bomb in megaton was indeed one or so megatons... Anyways if it was one megaton, in game megaton, andale (whatever) fort independence, gray ditch, and maybe some of arlington would have gone boom. Bigtown might have gotten hit too.