Idaho Code § 31-136
Minidoka county is described as follows: beginning at the point where the center of the main channel of Snake river is intersected by the west section line of section nineteen (19), township ten (10) south, range twenty-two (22) east;
Western boundary. Thence northerly along the township line to the northwest corner of township eight (8) south, range twenty-two (22) east; thence easterly along the township line to the southwest corner of section thirty-four (34), township seven (7) south, range twenty-three (23) east; thence north along the section line to the north line of township seven (7) south, range twenty-three (23) east; thence easterly along the township line to the southwest corner of section thirty-four (34), township six (6) south, range twenty-three (23) east; thence northerly along a line which is three (3) miles west of and generally parallel to the east line of range twenty-three (23) east, north of the first standard parallel south, to the north line of township three (3) south, range twenty-three (23) east;
Northern boundary. Thence easterly along said township line (1913, ch. 3, section 2, pp. 5, 6) to the intersection of the same with the line between ranges twenty-five (25) and twenty-six (26) east; thence south along the said range line (R.C., section 23e), to its intersection with the center of the main channel of Snake river; thence southwesterly along said center of the main channel of Snake river, to the point of beginning (1913, ch. 3, section 2, p. 6).
County seat-Rupert.
Idaho Code § 31-136