Montpelier, Vermont Has Systems To Prevent Ice Jams

The ice jam that caused the devastating flood in downtown
Montpelier in 1992 The city has now created measures
to prevent this from happening again

Ice jams are cropping up in Vermont and surrounding areas of the North Country, threatening abrupt floods as the ice dams up rivers swollen by melting snow. 

Montpelier, Vermont has a rough history with ice jams. In 1992, an ice jam formed along the Winooski River, which runs through the city. Water backed up and flooded virtually all of downtown Montpelier causing millions of dollars in damage.

This is easily one of the most dangerous ice jam seasons in years. A particularly cold winter allowed ice to form thick, strong sheets over the rivers. 

An abrupt and strong March thaw is rapidly melting the snow. That in turn is swelling the rivers and breaking up the ice.  A slower, more gradual thaw would have weakened the river ice, reducing the chances big chunks would pile up against obstacles to form dams.

But here we are. Montpelier, though, has a bunch of ice jam prevention plans and gizmos set up to avoid a repeat of 1992. Or a repeat of the summer of 2023 for that matter, when another flood trashed downtown Montpelier.

This all started in January, as it has every year since 2013 in Montpelier. Since the beginning of the year, the city has discharged treated wastewater into the Winooski River at three locations. That water is around 42 degrees, so it weakens ice in the river and creates channels where water a freely flow, as WPTZ reports. 

=The city has deployed a long-reach excavator to help move ice downstream if it starts jamming up in Montpelier, said Kurt Motyka, the city's public works director. 

So far, there are no reports of ice jam trouble in or near Montpelier during this warm spell. Other areas as of early this afternoon still have ice jams. I was up in Enosburg late this afternoon and, if anything, the ice jam near Boston Post Road is getting a little worse. 

A lot more ice chunks were coming down from upstream and adding to the jam. The jam started moving while I was there, but then stalled again after moving about 100 yards downstream. These things are unpredictable and things change near ice jams in an instant. 

Which is why Montpelier has invested so much in battling ice jams.