If your beaver have functionally destroyed your bridges through flooding, there might not be a way around tearing those dams down. Discouraging beavers at point A will not really be a detriment to nature if you can ENCOURAGE beavers to build at point B.
These 2 videos aren't EXACTLY what I was looking for, the do capture some of what I was saying.
Working with beaver to restore habitat.
This image and video
Working with Beaver to Restore Salmon Habitat
This one talks about building a partial dam to encourage the beavers to build at point B, thereby leaving point A alone.
Beaver dams without beavers? Artificial logjams are a popular but controversial restoration tool
Sorry its not exactly what you were looking for, or that I was looking for. But I have had a lot of wine tonight, so perhaps my google-fu will be better tomorrow. The general consensus is, that if you don't want to kill the beaver(anti-beaver murder = YAY), that you can't "stop" them from building damns at your bridges and culverts. You have to actively encourage them to build elsewhere. But if you need to be rid of an existing dam, you don't have an alternative but to tear it down. Having said that. Tear it down as early as possible! They need time to recover, since they store their food(young succulent branches) underwater and if the pond drops too low, the food won't stay good throughout winter.
Since it is "crown land"(which is equivalent to federal land in the US), you might be able to just drop some larger branches in the water closer to the main pond. Let them create noise turbulence. Remember, it appears to be noise that triggers the beaver. If you drop 2-3 trees across the streams t the same location, you have done 70% of the beaver's work for it. Its just filling the cracks at that point.