I’ve used those old wooden ones on several occasions.

Last month, High Country Fly Fishers helped make long-standing access to rivers over private lands a sustainable reality.
The organization — the Park City branch of Trout Unlimited, a nonprofit that works to preserve cold-water fisheries and wildlife habitats in and around them — built and installed a string of galvanized steel crossovers that replaced the weather-beaten wooden ones along the Weber River.

LINK (via Park Record)