The text reports an observation made in St. Marys, Alaska, on November 21, 2012, regarding air pockets in river ice caused by unusually high water during freeze-up and subsequent drops in water levels. The observation was shared with the ice research team at the UAF Geophysical Institute. The air pockets made traveling dangerous.

Observation: We had unusually high water during freeze-up then the water level dropped to normal levels causing air pockets and making traveling dangerous. Charles & Ursula Prince

LEO Comments: This observation has been shared with the ice research team at the UAF Geophysical institute.