Snapping turtles ARE DANGEROUS. That one looks huge. Some information I got from a NATURE CENTER. A 6 to 8 inch diameter turtle can bite thru a pencil as easily as you can bite thru a spaghetti noodle. Only safe way to pick one up is by its tail. The naturalist showed us as she did so. Any other way, and the neck is long enough to bite your fingers off. As you think this one may be 30 lbs. it would be a challenge to grab by the tail. A snow shovel and wheel barrow would be only option, as well as additional help. Such large turtle may be a hundred years old????? maybe less, not sure. Cavemanrich never suggests killing anything. (my personal belief) Just say to turtle " DON'T GO AWAY MAD........... JUST GO AWAY" 
Hopefully turtle finds his pond and stays there.

Hopefully turtle finds his pond and stays there.