Worked on the Allegheny at Tionesta for 30 years. Fortunate to see often! I average two miles on the bike trail that parallels Oil Creek from Titusville to Petroleum Center four times/week.. Enough mature growth between the trail and creek, anything in the air would be difficult to see until leaves are off. However, there is a power line near mile post 1 South that crosses it. Last August, just when I got there, husband and wife flying south above the creek. I don't have a lot of luck on it. One of my children, home from Boston last year, sees a bear. Sent me the video and I keep it on my phone to scare the flat landers! lol