I found this site the other day while looking for web cams in my state. It's live and reloads about every 30 seconds.
Check it out: www.Pancanal.com
The amount of freight that passes through these locks on huge container ships is amazing. I've seen huge cruise ships go through there too. There are 3 sets of locks and 2 lanes that raise or lower the ships to continue on their journey. Very cool