WaveOsaurus breaks on the Connecticut River in Holyoke, Massachusetts, named for the dinosaur footprints preserved in the rock just to the right of the wave. It's a solid right-shoulder wave that rewards advanced surfers willing to put in the time, because it's genuinely fickle—most years it only comes in and breaks properly once or twice, almost always during spring high water. That rarity is part of the appeal: when it lines up, local surfers treat it as an event, not just another session. If you're chasing it, keep an eye on spring flows and be ready to drop everything when it turns on.