Well I hate to reply to myself but I just got off the phone with the owner, Paul.
Boy do I feel dumb, while talking he mentioned calling the DNR and asking about the problem and having to lower the water in the lake.
Duh. Siphon time.
I really hate that I was going about the problem in the wrong order.
Lower the water level and then work on the damn.
The situation is perfect for a siphon, really only need about a 20 foot tube if that.
Ok so how do I go about beaver proofing a couple of siphons?
I'm sure that any siphon left unattended will be chewed through instantly, making it stop running.
Even one of hard PVC won't last more than a couple of minutes of chewing.
All the questions seem to come back to standing by with the 12 guage for a couple of days and eliminating the beavers.

Matt