NORWALK - Tree removal crews were kept busy today removing downed trees from roadways, off houses and out of yards in the aftermath of Hurricane Irene.

One tree expert says the number of fallen trees throughout southwestern Connecticut is in the tens of thousands and that the removal process could extend well into the fall.

Doug Williams, a manager at Bartlett Tree Experts, says his company's call volume increased from 20 a day to between 150-170 calls yesterday alone.

Williams also warns that the real danger is from trees that suffered damage, but aren't showing any visible signs. He says those trees could still come crashing down and recommends that homeowners have an arborist inspect their property.

State preparing for falling trees from Irene

MyPics: Hurricane Irene on CT