Wisconsin State Route 21 runs east-west across Northern Adams County. It runs from the Juneau/Adams County Line, near Strongs Prairie, to the Adams/Waushara County Line, near Coloma. In the eastern part of the county it passes a roadside natural attraction known as "Ship Rock". WI St Rt 21 passes through the following town in Adams County. Arkdale WI St Rt 21 is not multi-plexed in Adams County. WI St Rt 21 intersects the following highway in Adams County. Wisconsin State Route 13, near Cottonville.
A junction marker on SB WI St Rt 13. A junction marker on NB WI St Rt 13. EB WI St Rt 21 east of WI St Rt 13. EB WI St Rt 21 near 11th Ave. EB WI St Rt 21 near 7th Drive. EB WI St Rt 21 at Little Roche A Cri Creek. EB WI St Rt 21 west of Ship Rock. Ship Rock along WI St Rt 21. EB WI St Rt 21 east of Ship Rock. EB WI St Rt 21 near 4th Ave. EB WI St Rt 21 west of ACH G. EB WI St Rt 21 at ACH G.
