The Oak Road Nature Preserve is situated
northeast of Carlsville where Sunnyslope and
Oak Roads converge in a picturesque valley.
Included in the preserve are rolling hills,
fields bordered by woodlands, and views of an
occasional barn and farm house, but the major
feature of the preserve is an extensive vernal
wetland. Each spring it fills with water and
becomes an annual stopping point for migrating
waterfowl and breeding amphibians. When the
marsh fills with water, spring peepers (frogs)
are so abundant and loud that neighbors find it
hard to sleep at night, resulting in the local
name “Frog Town.” Water from this marsh drains
west off the preserve into nearby Plum Bottom,
and from there down the escarpment bluff and
eventually into Green Bay.