Idaho Code § 25-2405

The board of county commissioners may provide as a condition in any order creating a herd district which may hereafter be made that any agricultural lands in the proximity of public domain where cattle, horses or mules are grazed, shall be inclosed by a lawful fence and that any road extending from agricultural area to such public domain shall contain cattle guards or gates at such places and of such nature as the board shall prescribe. The board of county commissioners may make its herd district orders inapplicable to cattle, horses or mules straying from such public domain or along roads leading to such public domain until such agricultural lands are inclosed by lawful fence and such cattle guards or gates are installed.