Idaho Code § 31-114
Butte county is described as follows: beginning at the point, which, when surveyed, will be the southeast corner of section thirty-one (31), township one (1) north, range twenty-four (24) east;
Western boundary. Thence north to the summit of the range of mountains dividing the headwaters of Fish creek, Cottonwood creek and Copper creek from the waters of Lava creek, Champagne creek and Antelope creek; thence northwesterly along the summit of said range of mountains to the present boundary line between Blaine and Custer counties; thence in a northerly direction along and upon the boundary line of Custer county to the point of intersection with the southern boundary line of Lemhi county;
Northern boundary. Thence east along southern boundary line of Lemhi county and township line between townships ten (10) and eleven (11) north to the corner of sections three (3), four (4), thirty-three (33) and thirty-four (34), townships ten (10) and eleven (11) north, range twenty-nine (29) east on western boundary line of Clark county; thence south along the section lines and western boundary line of Clark county, to the corner of sections three (3), four (4), thirty-three (33) and thirty-four (34), townships seven (7) and eight (8) north, range twenty-nine (29) east, the southwest corner of Clark county; thence east along the southern boundary line of Clark county and township line between townships seven (7) and eight (8) north, to the corner of townships seven (7) and eight (8) north, ranges thirty-one (31) and thirty-two (32) east on west boundary of Jefferson county;
Eastern boundary. Thence south along range line between ranges thirty-one (31) and thirty-two (32) east, and western boundary line of Jefferson county, to the southeast corner of township four (4) north, range thirty-one (31) east, Boise meridian; thence westerly along the township line seven and eighty-one hundredths (7.81) chains to the closing corner of sections three (3) and four (4), township three (3) north, range thirty-two (32) east, Boise meridian; thence south along section lines to the corner of sections three (3), four (4), thirty-three (33) and thirty-four (34), townships twenty-two (22) and three (3) north, range thirty-two (32) east, on the western boundary of Bingham county; thence west along the township line and western boundary line of Bingham county to the corner of townships two (2) and three (3) north, ranges thirty (30) and thirty-one (31) east, Boise meridian; thence south along the range line and western boundary line of Bingham county to the corner of township two (2) north, ranges thirty (30) and thirty-one (31) east, Boise meridian; thence west along the township line and western boundary line of Bingham county to the closing corner of sections three (3) and four (4), township one (1) north, range thirty (30) east; thence south along the section lines and western boundary line of Bingham county to the standard corner of sections thirty-three (33) and thirty-four (34), township one (1) north, range thirty (30) east; thence west to closing corner of sections three (3) and four (4), township one (1) south, range thirty (30) east; thence south along section lines and western boundary line of Bingham county to the corner of sections three (3), four (4), thirty-three (33) and thirty-four (34), townships one (1) and two (2) south, range thirty (30) east;
Southern boundary. Thence west along township line and boundary line of Bingham and Blaine counties to what will be, when surveyed, the southwest corner of township one (1) south, range twenty-seven (27) east, Boise meridian; thence north along the boundary line of Blaine county and what will be, when surveyed, the west boundary of township one (1) south, range twenty-seven (27) east, Boise meridian, to what will be, when surveyed, the northwest corner of township one (1) south, range twenty-seven (27) east, Boise meridian; thence west along the Base line and boundary line of Blaine county to the southeast corner of section thirty-one (31), township one (1) north, range twenty-four (24) east, Boise meridian, to place of beginning.
Idaho Code § 31-114