Idaho Code § 42-4413

If an order be entered establishing the district, such order shall be deemed final and no appeal or writ of error shall lie therefrom, and the entry of such order shall finally and conclusively establish the regular organization of the said district against all persons except the state of Idaho, in an action in the nature of a writ of quo warranto, commenced by the attorney general within thirty (30) days after said decree declaring such district organized as herein provided, and not otherwise. The organization of said district shall not be directly or collaterally questioned in any suit, action or proceeding except as herein expressly authorized.