OMG, Loved hiking this trail last Monday. We got up early, and were there by 7:30 a.m it gets busy as the day goes on.. So arrive early, do not hike in summer when it's HOT.. It was the perfect temp.. Light breeze, and amazing views. I took close to 100 pictures.. The tunnels are cool, eerie, dark and fun to explore.. The trails weave thru many tunnels, there is photo boards along the trail to tell you about the history of it.. It leads you to the Dam at the other end. Spring wild flowers were blooming, views of the lake.. I can't wait to hike this again before summer.. We were there 3 hours.. We took our time, steady pace and took in all the scenery..