Idaho Code § 50-1313: Dedication must be accepted.

No street or alley or highway hereafter dedicated by the owner to the public shall be deemed a public street, highway or alley, or be under the use or control of said city or highway district unless the dedication shall be accepted and confirmed by the city council or by the commissioners of the highway district. An acceptance imposes no obligation or liability upon the city council or highway district until the street, highway or alley is declared to be open for public travel.