Wis. Stat. § 23.20: Use of department gravel pits.

The department may permit any town, county or state agency to obtain gravel, sand, fill dirt or other fill material needed for road purposes from any department-owned gravel pit or similar facility if this material is unavailable from private vendors within a reasonable distance of the worksite. The department may require environmental safeguards before permitting a town, county or state agency to obtain this material. The department shall charge a fee for this material commensurate with the fee charged by private vendors.