Shawn, there may be more tham 1 colony on a lake.It's one of those deals, if conditions are right and depending on the size of the lake--you could have several colonies.
As the ice pulls away from shore,these beaver will move like crazy.They have been locked in all winter.If you have interconnecting rivers and streams,they will cruise these also.
You will have another big push of traveling,as the two year olds are expelled from the colonies. When this happens, you will have beaver in a bout any piece of water around--They are like the ole boll wevil---"just a lookin for a home".
Get ready for "castor Mound Making Time "--spring beaver trapping is my favorite season of all.--Got Lure?
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Good luck.
Tom