Keep those Squaretops safe!
Are you able to secure them with a cable-style lock to a frame or casting platform? I've been quite surprised at how freely people leave their oars in boats around Missoula, but all it takes is one dishonest person in the right place at the wrong time.
Take them inside with you, or cover the boat and lock them to frame/platform. Anything to slow down a thief is usually enough to deter them.