Dense forest

An aerial survey conducted by the U.S. Forest Service estimates there are 587,000 dead trees on 95,000 acres in the Stanislaus National Forest.

Pilots and scientists who did an aerial survey of dead trees up and down California last year found elevated levels of tree mortality, with an estimated 9.5 million dead trees on 1.3 million acres, according to a 2021 Forest Service report, summaries, and a graphic released last week.

“Most of the mortality can likely be attributed to the lingering effects of the 2012-2016 exceptional drought and subsequent successful bark and engraver beetle attacks” that have now killed more than 172 million trees since 2010, Forest Service researchers said in a January report, “2021 Aerial Detection Survey Results: California.”