What's happening to our trees?


February 5, 2020

Courtesy Photo

Mary Tiernan, arborist with Boulder County, prunes a tree on the Twin Lakes property

In a field dominated by men, two women make up Boulder County's entire urban forestry team--Cathy Thiltgen and Mary Tiernan. "We take a lot of pride in that," said Thiltgen.

If you have walked the Niwot trails lately, you've probably noticed these two women hard at work. As Thiltgen explained, their main objective is "looking at trees that may impact the trail or trail users and pruning any po...

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