Idaho Code § 43-323
A change in the generally described place of use for a water right held by an irrigation district may be made without applying for a change under the provisions of section 42-222, Idaho Code, provided the district files with the department of water resources a map portraying the changes to the generally described place of use within which the district's water rights shall be exercised. For this filing requirement, it shall be sufficient to provide a drawing on a seven-and-one-half-minute (7-1/2) quadrangle map having a scale of one to twenty-four thousand (1:24,000) which shows the changes to the outer limits of the boundaries of the irrigation district to include each quarter-quarter section within which irrigation occurs. This map showing changes to the generally described place of use shall be filed with the department no later than April 1 of the year following the changes. Notwithstanding the filing of such map, only the legal description of an irrigation district's boundaries recorded in compliance with title 43, Idaho Code, shall constitute conclusive proof of the district's boundaries for purposes other than defining the generally described place of use for a water right held by the district.
Idaho Code § 43-323