Ron Krupp: The wonder of Alburgh Dunes and Bog

Editor’s note: This commentary is by Ron Krupp, who is the author of “The Woodchuck Returns to Gardening.” It originally aired on Vermont Public Radio on Dec. 6, 2015.

As the cold advances and snow arrives, I like to reflect back on my favorite warm weather moment – the trip I took this summer to the Alburgh Dunes and Bog on a tour sponsored by the Vermont Hardy Plant Club and led by plant biologist Liz Thompson.

First, we visited a stretch of rare sand dunes where we saw buttonbush and fresh water cord grass – more often found along the Atlantic shore. We also saw Champlain beach grass and the low-growing beach-pea – both rare plants that are remnants of the post-glacial era, when Lake Champlain was an inland estuary of the Atlantic Ocean. Unfortunately, poison ivy has invaded the dunes – so we had to be careful where we walked.

For years, Moe Theoret was park director of the Alburgh Dunes. He recalls when they were being bulldozed to replenish the nearby beach. Protective vegetation was damaged when trees were being cut for firewood and beach visitors were walking on the beach grass. Today, protective fencing has been installed and the dunes are repairing themselves. Large turtles and other wildlife can be seen — including coyotes, foxes, fishers, owls, deer, moose and bear.

On nearby Isle La Motte, there’s a fossil reef some 480 million years old containing some of the oldest corals in the world; corals that grew in a tropical sea.

 

The 625-acre Alburgh Dunes became a state park in 1996. Its south-facing sand dunes are one of the longest beaches on Lake Champlain. Together, the beach and dunes make up what’s known as a barrier island, geologically similar to coastal formations more common along ocean shorelines. This barrier sits between the lake shore and a wetland bog — with beach and dunes both slowly migrating into and over the wetland.

There’s a layer of peat more than 26 feet deep in the black spruce swamp and bog, where we found sphagnum moss, pitcher plants, high-bush blueberry, cotton grass, mountain holly, bog and sheep laurel, dwarf mistletoe and labrador tea. Core samples from the bog reveal a record of climate and vegetation dating back to the Ice Age. The swamp and bog are more typical of those found in the cooler Northeast Kingdom – and quite a contrast to the neighboring sand dunes.

Once, Lake Champlain was a salt water sea inhabited by whales. The sea flowed south, forming the dunes about 10,000 years ago. On nearby Isle La Motte, there’s a fossil reef some 480 million years old containing some of the oldest corals in the world; corals that grew in a tropical sea.

I can almost feel the warm breezes as I contemplate this amazing place we call home.

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  • Rita Pitkin

    Fascinating. I have not been there but will check it out. Thank you!

  • Kate Kruesi

    We enjoyed that trip with Liz, you and Eric. So grateful Eric organized it for us – such an interesting botanical and geologic history our lake and shores have!

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