Idaho Code § 31-109
Blaine county is described as follows: beginning at the southeast corner of township two (2) south, range seventeen (17) east, thence east along the township line between townships two (2) and three (3) south, 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 to the middle of the channel of Snake river; thence up the center of the said channel of Snake river to the point of intersection with the range line between ranges twenty-seven (27) and twenty-eight (28) east; thence north along and upon said range line to the northwest corner of township nine (9) south, range twenty-eight (28) east; thence east upon and along the north line of said township nine (9) south, to the northeast corner of section four (4), township nine (9) south, range twenty-eight (28) east; thence in a northerly direction along and upon the section line which when surveyed will be between sections thirty-three (33) and thirty-four (34), township eight (8) south, range twenty-eight (28) east; and an extension of such line to the point where such extended line will intersect with the township line which when surveyed will be the township line between townships seven (7) and eight (8) south, range twenty-eight (28) east; thence west upon the township line to a point which when surveyed will be the southwest corner of township seven (7) south, range twenty-eight (28) east; thence north along and upon the range line which when surveyed will be the range line between ranges twenty-seven (27) and twenty-eight (28) east to a point which when surveyed and established will be the northwest corner of township four (4) south, range twenty-eight (28) east; thence east along and upon the north line of said township four (4) south to the northeast corner of township four (4) south, range twenty-nine (29) east; thence north along the range line between townships twenty-nine (29) and thirty (30) east, to the northeast corner of township two (2) south, range twenty-nine (29) east, thence west to what will be, when surveyed, the southwest corner of township one (1) south, range twenty-seven (27) east; thence north to what will be, when surveyed, the southwest corner of township one (1) north, range twenty-seven (27) east; thence west to the southeast corner of section thirty-one (31) in township one (1) north, range twenty-four (24) east; 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 southern boundary line of Custer county; thence westerly along and upon the summit of the range of mountains dividing the headwaters of the East Fork of the Salmon river from the waters of the Little and Big Wood rivers and continuing westerly on the said divide between the East Fork of the Salmon and Wood rivers to the intersection of the longitude line of longitude one hundred fourteen (114) degrees, forty (40) minutes west from Greenwich; thence north on said longitude line to a point on said divide due east of the northeast corner of section twenty-four (24), township seven (7) north, range fourteen (14) east; thence due west to the northeast corner of section twenty-four (24), township seven (7) north, range fourteen (14) east; thence west along and upon the section lines to the corner of sections fifteen (15), sixteen (16), twenty-one (21) and twenty-two (22), township seven (7) north, range fourteen (14) east; thence north along and upon the section lines to the corner of sections three (3) and four (4) and thirty-three (33) and thirty-four (34), township seven (7) and eight (8) north, range fourteen (14) east; thence north along and upon the section lines to the one-quarter (1/4) section corner between sections twenty-seven (27) and twenty-eight (28), township eight (8) north, range fourteen (14) east; thence west along and upon the one-quarter (1/4) section lines to the west one-quarter (1/4) section corner of section thirty (30), township eight (8) north, range fourteen (14) east; thence southwesterly along and upon the summit of the mountains dividing the waters of Yellow Belly lake and Pettit lake to the summit of the Sawtooth mountains; thence following the summit of the said mountains to where the trail crosses the summit of what is known as Mattingly creek divide on the boundary line of Camas county; thence southeasterly along the boundary line of Camas county to the place of beginning.
County seat-Hailey.
Idaho Code § 31-109