Fish species found in Lake Washington include bowfin, bream (bluegill), buffalo, bullhead, carp, channel catfish, crappie, drum, flathead catfish, gar, green sunfish, hybrid white bass, largemouth bass, minnows, silversides and yellow bass.

Mann and is listed on the National Register of Historic Places (HRHP).

[4] Another pre-Civil War mansion, Mount Holly, constructed on the east shore of Lake Washington, is also listed on the NRHP.

[5] The Junius Ward home was built at Erwin in 1826 as a log cabin, still standing today and is still owned by the same family.

The Law House, an impressive mansion overlooking the lake built in 1902, was ordered as a kit from the Sears & Roebuck Company,[6] and was used in the filming of the 2012 movie Haunted.