The horseshoe of dirt is made so that the trap pan will sit at about 2" deep in the water. The outside edge of the dirt horseshoe is whatever height it needs to be to get the outside lip about 1-1/2" to 1" under the surface. Think of it as a step down dirthole set.
The horseshoe just serves as a trap platform and a landing pad to direct the front legs. Kind of like a poke stick set where the beaver drops the front legs when it thinks it has hit bottom when the stick pokes them.
In some cases I'll even pile rocks up to make the ledge/landing pad and then put dirt on it so I can bed the trap.
In this particular set,the current was pretty fast and came from the top of the picture to the bottom. So the beaver would work in from the bottom going up. I was attempting to guide them to crawl up on the far left edge of the bank, or else just about up the middle. You can see how that's the easiest way for them to go. Most importantly,with coilsprings vs conis, see how the trap is offset to the right (or could be left...depending on the set), so I'll hit just that one back foot and not the belly.
Additionally, I place them so if they go back down to the water using the the middle path they'll hit it with the front feet while sliding in.
I normally get about 90-95% back foot catches, but do also get some front foot catches with this type of set. So...try and plan for both ways. A 330 or a 660 would be "easier" as all you have to do is plan for the head to go in....and not worry so much about foot placement. If I'm in areas where I can use coni's then I do. But sometimes beavers avoid conis and then this MB750 setup works better.
Here's a picture of a beaver taken in that exact set. Note how I caught it by the back foot just as planned. Sometimes you get lucky...LOL. I love those MB 750s!! That stick jammed in the jaws was the size of my thumb and the trap still held that beaver solid.
