Idaho Code § 31-115
Camas county is described as follows: beginning at the southwest corner of township two (2) south, range twelve (12) east;
Southern boundary. Thence due east along the township line between townships two (2) and three (3) south, to the southeast corner of township two (2) south, range seventeen (17) east;
Eastern boundary. Thence north along the township line between ranges seventeen (17) and eighteen (18) east, to the southeast corner of section twelve (12), township two (2) south, range seventeen (17) east; thence west one (1) mile, to the southwest corner of section twelve (12), township two (2) south, range seventeen (17) east; thence north along the section line to the intersection of said line and the center of the channel of Big Wood river; thence westerly along said Big Wood river to the junction of Big Wood river and Malad river (or Camas creek); thence westerly along the center of the channel of Malad river (or Camas creek) to the intersection of said river and the section line between sections fourteen (14) and fifteen (15), township one (1) south, range sixteen (16) east; thence north along said section line to the township line between township one (1) south, range sixteen (16) east, and township one (1) north, range sixteen (16) east; thence east along said township line to the southeast corner of section thirty-four (34), township one (1) north, range sixteen (16) east; thence north along the section line two (2) miles to the northeast corner of section twenty-seven (27), township one (1) north, range sixteen (16) east; thence west along the section line one (1) mile to the northwest corner of section twenty-seven (27), township one (1) north, range sixteen (16) east; thence northerly along the section line to the main divide between Beaver creek on the west and Camp creek on the east; continuing thence northerly along the summit of the said mountain range or watershed between Beaver creek and Camp creek to its junction with the summit of the mountain range or watershed dividing Willow creek and its tributaries on the west and Big Wood river and its tributaries on the east; thence continuing northerly and westerly along the said last-mentioned summit across Buttercup mountain to a point which is approximately five (5) miles northwest of Buttercup mountain and two (2) miles south of the U.S.G.S. bench mark elevation 7281, on Warm Spring creek, which point is marked "Elevation 8588" on U.S.G.S. topographical map of Idaho Sawtooth quadrangle, edition of January, 1900, reprinted February, 1909; thence continuing along the summit about north thirty-five (35) degrees west to a point designated on said map of said quadrangle as "Elevation 8492"; thence westerly along said summit to a point marked "Elevation 9310" on said map; thence northerly along the summit of the Smoky mountains forming the summit of the watershed dividing the Boise river and its tributaries on the west, the Big Wood river and its tributaries on the east to its intersection with the summit of the Sawtooth mountains at a point marked "Elevation 10,000" on said map, where the said summit of the Sawtooth mountains forms a watershed dividing the Boise river and its tributaries on the west and south, the Salmon river and its tributaries on the west and north, and Big Wood river and its tributaries on the east;
Northern boundary. Thence westerly along the summit of the Sawtooth mountains, where it forms a watershed between the Boise river and its tributaries on the south, and the Salmon river and its tributaries on the north to its intersection with the eastern boundary of Elmore county at a point where the trail crosses the summit of what is known as Mattingly Creek divide;
Western boundary. Thence in a southerly direction along the main divide between the middle fork and the south fork of the Boise river to a point on the divide between Willow creek and Bear creek; thence in a southerly direction on the main divide between Willow creek and Skeleton creek to the center of the channel of the south fork of the Boise river; thence down the channel of the river to the point of intersection with the range line between ranges eleven (11) and twelve (12) east, approximately in township three (3) north; thence south along the range line between ranges eleven (11) and twelve (12) to the township line between townships two (2) and three (3) south, the point of beginning.
County seat-Fairfield.
Idaho Code § 31-115