You were in violation if you were closer than 300' to the dam. Nothing but one rod and reel in that area. No commercial fishing to to arrival point down stream I think. Man your lucky to be let off so light.
I reread your post and you are right. My thinking was still on "between the bridge and dam." But I see now where you said "within the 100 yd sign" was a violation and that is right. Anyway, back to crappie fishing.