In this July 2 photo, forester Tom McQuaide admires the colossal sized tree he discovered while marking trees to harvest on property in Bell Township, Pa. The Red Oak tree is expected to be roughly 400 years old and will not be included in the harvest.

PITTSBURGH — A forester in Pennsylvania says he’s discovered a massive red oak tree that may be one of the biggest trees in the state.

Tom McQuaide, a forester with Pennsylvania Forest Management, is in the process of submitting the tree’s measurements for inclusion in the Champion Trees of Pennsylvania, a registry of the state’s largest trees.

McQuaide says the red oak has a circumference of about 26 feet and a height of about 120 feet. Officials say the tree could be 400 years old. The tree was discovered near a Bell Township farm outside of Pittsburgh.

The largest recorded red oak in the state is in Delaware County with an 18 foot circumference and 145 feet tall.

McQuaide says he and the property owner agreed to let the tree continue standing as a monument.