Idaho Code § 40-1003: Notice of call.

The district treasurer shall provide himself, at the expense of the district, with a bulletin board, across the top of which shall be painted or inscribed the words, "…. highway district warrant bulletin." It is the duty of the treasurer to keep the bulletin board conspicuously, securely and permanently in place in his office, and upon it place in a manner which will insure continuous notice of not less than sixty (60) days all notices issued by him, whether written or printed, calling for the presentation of district warrants for payment.