Acutally it is legal to bowfish Lake Springfield. The lake regulations state:
"In most cases, fish and other aquatic life may be caught using only a hook attached to a single line. The exception to this is that pitchforks, underwater spear guns, bows and arrows (or a bow and arrow device), spear or gig are also permitted for the capture of carp, buffalo, suckers, gar and bowfin."
This info is located at:
http://www.cwlp.com/Lake_Springfield/Water_sports/fishing.htm#Fishing%20Rules:
I'm definately going to bowfish out there, but I'll make sure I have a copy of that with me.