Here are several benches I have built for around my ponds.
Two of the benches are relatively easy to make with either a
jigsaw or bandsaw. A router would be useful to round over the
edges of the boards after cutting.
The first two benches were made from a single pressure treated
12' long 1x12s and a few pieces of lumber I had around. I got
the idea for the S-Bench on a pond tour organized by Aquatics
& Exotics in Pinellas County, Florida. The bench I saw was
just 1/2 of the S which I thought could be improved by doubling
The Book Bench is a derivative of the S-Bench, just flip over
the second curve. It could be expanded to a table by putting
straight boards between the two curved pieces and changing the