The Crater Lake Monster (1977) 
Not being the biggest fan of 'Creature Features' for the most part, there is a vast cheesy low-budget back log of schlock to which I have not yet endured to experience. The Crater Lake Monster is one of those such films.
A slow, tonally erratic film concerning the discovery of a prehistoric creature in a small town's local lake. This plot itself often takes a back-seat to the capering of two hillbilly types who run a boat rental business. When they're not arguing, fighting and splashing about in the water together slapstick style they're renting boats out to tourists despite knowing there is a creature at large somewhere on the lake. There is also a strange sub-plot involving a bearded man who guns down convenience store staff and patrons alike to then steal a tiny bottle of booze...
All that said, It's impossible not to love the stop motion creature, who despite looking far from convincing (especially in close up when it reverts from a long-necked plesiosaur to a static mini T-Rex style head being moved around by two stage hands) brings a little magic to an otherwise dull and forgettable film.