045-6 Wyo. Code R. § 6-10
(a) Urban Areas - Depending on the type of facility crossing being proposed and the physical constraints at the site, the Department's engineer may authorize open trenching or require a bored crossing of the roadway template and paved surface.
When an open trench is authorized the backfilling and compaction of the trench as well as the replacement of the paved surfaces will be as specified by the Department.
(b) Rural Areas - Utility facility crossings in rural areas, whether across the main roadway or connecting paved sideroads and approaches, shall be bored.
The acceptable methods are boring/drilling, pushing or jacking, and tunneling. The use of a high pressure stream of liquid Getting) to create a cavity for subsequent placement of a utility line is not permitted.
(c) The diameter of any bore shall not exceed the outside diameter of the pipe being placed by more than five (5) percent.
(d) The applicant's engineer is advised to make arrangements with the Department's engineer regarding a site investigation to determine if boring is feasible in the proposed locations.
045-6 Wyo. Code R. § 6-10