small outdoor bridge

I live on a 10 acre plot of land. There is a small swamp and pond that separate the front 2.5 acres from the rest of the land in the back. Between these two bodies of water is a small walkway that has a stream that runs from the swamp to the pond, this makes it impossible to access the back half of the property with the riding lawn mower.

I had a few boards bridging the gap in the past, but once I purchased a larger lawnmower it was no longer an option to drive over. Time to add a larger bridge!