Missouri Secondary State Route BB is an east-west highway in Northeastern Phelps County. It runs from BUSN Loop I-44/U.S. Rt. 63, at Rolla, to Missouri State Route 8/68, at St. James. MO Sec St Rt BB passes through the following towns in Phelps County. Rolla
St. James
MO Sec St Rt DD is not multi-plexed in Phelps County. MO Sec St Rt DD intersects the following highways in Phelps County. BUSN Loop I-44, at Rolla. U.S. Rt. 63, at Rolla.
