That trap is not near big enough for a beaver. You can trap them on land but if doing so you should use snares or a Hancock style live trap. Beaver are very strong and hard to hold on to. I use #5 double longsprings or #4 coilsprings, modified, or a #330 conibear for them. I wouldn't recommend trapping them on land, you will end up with a lot of pull outs and or wring outs, even worse. Beaver sets should berigged with a drowning slide unless snaring or live trapping. You could use the #330 but in many states it is illegal to set a trap that big above water. Check your regulations.