There's Only One Route RD

Route RD in Hickory County, Mo.

Not only does the Pomme de Terre Lake region feature the unusual Missouri 64B, it also has the only supplemental route RD in the state.

There are several supplemental routes beginning with R, but almost all of them are named RA or RB. Route RD, in Hickory County, is a short road leading into a county road on the east side of Pomme de Terre Lake.