I'm very afraid of heights, or really I'm afraid of falling and hurting myself and I have a very vivid imagination so crossing the swinging bridge was a trial at best. I was most comfortable crossing at night--what you can't see can't hrut you. But one evening I remember stepping into one of the missing planks, falling forward, just catching myself--I about died! Here's a more modern pictures of the bridge--I don't really know where I got it from. It's viewing from the Indian creek/Philo side towards camp.
I'd guess its 40 feet from the bottom of the bridge to the river bank. I highest I saw the river was about 5 feet below the bridge but I hear it's been higher. The Navarro, like many rivers in California, is small in the summer but drains a fairly large area so when it really rains it comes up fast!
I'm also guessing it's about 150 feet long. In the old days there was a small parking lot because in the winter this was the access. I visited camp a lot in winter time, I worked for Irv and Edna during my breaks as a way to have a place to stay--they had an informal deal, if you worked in the mornings, cutting fire wood, whatever for the maintenance man, you could stay. This was perfect for me as I loved both the place and the work. But it did mean dealing with the swinging bridge.