Idaho Code § 40-203B
Whenever the Idaho transportation department is either planning to abandon any section or all of a state highway to a county, a city or a highway district or assume control of a section or all of a highway which is under the jurisdiction of a county, city or a highway district, the transportation department shall first obtain the consent of the applicable local highway jurisdiction before it may abandon or assume control of the highway. Consent shall be obtained by passage of a resolution by the local highway jurisdiction assenting to the proposed action of the transportation department. Prior to consenting to an abandonment or assumption of the applicable highway, the local highway jurisdiction may conduct a public hearing and also provide notice to any impacted property owners, businesses, industries and enterprises. If consent is not obtained as provided in this section, the action by the transportation department regarding the abandonment of a state highway or assumption of control of a local jurisdiction highway shall be null, void, and of no force and effect.
Idaho Code § 40-203B