- source: Getty Thesaurus of Geographic Names
Riffe Lake is a 23.5 mi (38 km) long reservoir on the Cowlitz River in the U.S. state of Washington. Originally named Davisson Lake, it was created in 1968 with the construction of Mossyrock Dam. The lake was renamed in 1976 after the community of Riffe, which was inundated by the lake. 
In 1893, 60 Appalachians from West Virginia migrated together to Lewis County. They were led by a Southern Baptist minister named Floyd Riffe. They named their settlement for Riffe. 
- Family Things by Mim A website about some of the Appalachian migrants.
- RIFFE CEMETERY GRAVE LIST NEW LOCATION "When the dam was built and the graves moved to other cemeteries, there was a list put out by the (I believe) Army Corp of Engineers. There were 221 graves moved from Riffe Cemetery."