The Adams County Highway Department is responsible for the construction, maintenance, and repair of the 247 miles of roadways on the County Highway System.

The County Highway Department also prepares plans, specifications and estimates for all bridges and culverts to be built by the County, or by any of the 22 Road Districts within the County and supervise the construction of all these bridges and culverts.

The County Highway Department advises the Highway Commissioners of the 22 Road Districts in the County as to the best methods of construction of new roads and the repair or maintenance of 1, 159 miles of Road District roads.

In addition to the duties associated with roads in Adams County, the Adams County Highway Department also maintains the Adams County Geographic Information System and administers the Floodplain Program .