Some time between 11pm and 7am our snapping turtle left us. God speed turtle!
To answer one of the questions in the comments, no, turtles don't sit on their eggs they drop 'em and leave. But we will work to keep the eggs safe for the next 6-7 weeks. Once they hatch we were told we can move the babies to the stream. (Sam is having a little trouble being convinced that a snapping turtle wouldn't make a good pet.)
Our dog gets it that she isn't allowed to dig where the eggs are but we have some concerns about the neighborhood cats. We're thinking we should construct a wire dome of some sort.