We drove up the Blackfoot River to witness one of these bad boys in '97. It was cutting down trees, making a infernal, slow motion roaring. Scoured the riverbed and a lot of the floodplain. Pretty scary. I remember driving on I-90 to go rockclimbing at Mulkey Gulch, way up in May that year, and there was a chunk of ice as big as a tractor trailer, way out in a field, glittering in the sun. Had to stop and wonder, then remembered-ahah! the ice jam!
History of Missoula, there was one during or after WW2 on the Clark Fork right in town, and they had to set a bunch of explosives to blow it before the town was wrecked and flooded. Also, at the time, the history noted, everybody threw their garbage in the river, and the ice jam kept it all from going downstream so there was an added desperation to that one.

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Nature is always amazing! I was thinking 'what if there was someone downstream' when this happened, and low and behold. There is no warning system on the G for such and event. I'm happy they were stranded and not taken down. I've seen events like this except in smaller streams with mud flows, however, it took years for that stream to recover.

Amazing video. I recall working for the County road dept. in Meeker CO when we would dynamite ice jams at Buford on the White River that would be flooding the community.