Cal. Gov. Code § 23104
The boundaries of Butte County are as follows:
Beginning at the northwest corner of Yuba, in the center line of the Feather River, opposite the mouth of Honcut Creek; thence northeasterly up the Honcut Creek and the South Honcut Creek, following their various meanders and along the boundary line as surveyed in the year 1901 by B. L. McCoy, County Surveyor of Butte County, and Jason R. Meek, County Surveyor of Yuba County, to its intersection with the south line of Sec. 31, T. 19 N., R. 6 E., M. D. B. & M., and running thence east to the southwest corner of the SE. 1/4 of the SE. 1/4 of Sec. 31, said township and range; thence north three-quarters of a mile; thence east one-quarter of a mile; thence north one-quarter of a mile, to the corner common to Secs. 29, 30, 31, and 32, said township and range; thence east one-half mile to the one-quarter section corner between Secs. 29 and 32, said township and range; thence north one-half mile to the center of Sec. 29; thence east one-half mile to the one-quarter section corner between Secs. 28 and 29, said township and range; thence north three-quarters of a mile; thence east one-quarter of a mile; thence north three-quarters of a mile; thence east one-quarter of a mile to the one-quarter section corner between Secs. 16 and 21, said township and range; thence north one and one-half miles to the center of Sec. 9, said township and range; thence east one and one-half miles to the one-quarter section corner between Secs. 10 and 11, said township and range; thence south one-half mile to the corner common to Secs. 10, 11, 14, and 15, said township and range; thence east two miles to the corner common to Secs. 12 and 13, T. 19 N., R. 6 E., and Secs. 7 and 18, T. 19 N., R. 7 E., M. D. B. & M.;
Thence north one mile to the corner common to Secs. 1 and 12, T. 19 N., R. 6 E., and Secs. 6 and 7, T. 19 N., R. 7 E., M. D. B. & M.; thence east three miles to the corner common to Secs. 3, 4, 9, and 10, T. 19 N., R. 7 E., M. D. B. & M.; thence south one-half mile to the one-quarter section corner between Secs. 9 and 10, said township and range; thence east one and one-half miles to the center of Sec. 11, said township and range; thence north one-half mile to the one-quarter section corner between Secs. 2 and 11, said township and range; thence east one-half mile to the corner common to Secs. 1, 2, 11, and 12, said township and range; thence north two miles to the corner common to Secs. 25, 26, 35, and 36, T. 20 N., R. 7 E., M. D. B. & M.; thence east one-half mile to the one-quarter section corner between Secs. 25 and 36, said township and range; thence north one-half mile to the center of Sec. 25, said township and range; thence east one and one-half miles to the one-quarter section corner between Secs. 29 and 30, T. 20 N., R. 8 E., M. D. B. & M.; thence north one-quarter of a mile; thence east one-half of a mile; thence north one and one-quarter miles to the one-quarter section corner between Secs. 17 and 20, said township and range; thence east one and one-half miles to the corner common to Secs. 15, 16, 21, and 22, said township and range; thence northerly to the common corner of Plumas, Butte and Yuba; thence northerly to the northeast corner of the SE. 1/4 of the SE. 1/4 of Sec. 9, T. 20. N., R. 8 E.;
Thence west one-half mile; thence north three-quarters of a mile to the quarter section corner between Secs. 4 and 9, said township and range; thence west to the corner common to Secs. 4, 5, 8 and 9, said township and range; thence north one-half mile to the quarter section corner between said Secs. 4 and 5; thence west one mile to the quarter section corner between Secs. 5 and 6, said township and range; thence north one-half mile, more or less, to the north corner of Secs. 5 and 6, said township and range; thence west on township line one and a quarter miles, more or less, to the southwest corner of Sec. 31, T. 21 N., R. 8 E., M. D. B. & M.; thence north on township line, two miles to the east corner of Secs. 24 and 25, T. 21 N., R. 7 E., M. D. B. & M.; thence west one mile to the corner common to Secs. 23, 24, 25, and 26, said township and range; thence north one-half mile to the quarter section corner between Secs. 23 and 24, said township and range; thence west one-half mile to the center of said Sec. 23; thence north one-half mile to the quarter section corner between Secs. 14 and 23, said township and range; thence west one-half mile to the corner common to Secs. 14, 15, 22 and 23, said township and range; thence north one mile to the corner common to Secs. 10, 11, 14 and 15, said township and range; thence west one mile; thence north one mile; thence west one mile; thence north two miles; thence west one mile; thence north one mile; thence west one mile, to the east corner of Secs. 24 and 25, T. 22 N., R. 6 E., M. D. B. & M.;
Thence north, on the township line, one mile to the east corner of Secs. 13 and 24, said township and range; thence west one mile to the corner common to Secs. 13, 14, 23, and 24, said township and range; thence north one mile to the corner common to Secs. 11, 12, 13 and 14, said township and range; thence west one mile to the corner common to Secs. 10, 11, 14 and 15, said township and range; thence north one mile to the corner common to Secs. 2, 3, 10 and 11; thence west one-quarter mile; thence north one-quarter mile; thence west one-quarter mile; thence north one-quarter mile to the center of Sec. 3, said township and range; thence west three-quarters of a mile; thence north one-half mile to the north boundary of Sec. 4, said township and range; thence west on township line one-half mile; thence north one mile; thence west three-quarters of a mile to the quarter section corner between Secs. 29 and 32, T. 23 N., R. 6 E., M. D. B. & B.; thence north one mile to the quarter section corner between Secs. 20 and 29, said township and range; thence west one mile to the quarter section corner between Secs. 19 and 30, said township and range; thence north one mile to the quarter section corner between Secs. 18 and 19, said township and range; thence west one-half mile to the west corner of said Secs. 18 and 19; thence north, on township line, one mile to the east corner of Secs. 12 and 13, T. 23 N., R. 5 E.; thence west one mile to the corner common to Secs. 11, 12, 13 and 14, said township and range;
Thence north one-half mile to the quarter section corner between said Secs. 11 and 12; thence west one mile to the quarter section corner between Secs. 10 and 11, said township and range; thence north one-half mile to the corner common to Secs. 2, 3, 10, and 11, said township and range; thence west one mile to the corner common to Secs. 3, 4, 9, and 10, said township and range; thence north one mile to the north corner of said Secs. 3 and 4, two miles to the corner common to Secs. 27, 28, 33, and 34, T. 24 N., R. 5 E., M. D. B. & M.; thence west one mile to the corner common to Secs. 28, 29, 32, and 33, said township and range; thence north one mile to the corner common to Secs. 20, 21, 28, and 29, said township and range; thence east one mile to the corner common to Secs. 21, 22, 27, and 28, said township and range; thence north one mile to the corner common to Secs. 15, 16, 21, and 22, said township and range; thence west one-half mile to the quarter section corner between said Secs. 16 and 21; thence north two miles to the quarter section between Secs. 4 and 9, said township and range; thence east one-half mile to the corner common to Secs. 3, 4, 9, and 10, said township and range; thence north one mile to the north corner of Secs. 3 and 4, said township and range, two miles to the corner common to Secs. 27, 28, 33, and 34, T. 25 N., R. 5 E., M. D. B. & M.;
Thence west one-half mile to the quarter section corner between said Secs. 28 and 33; thence north two miles to the quarter section corner between Secs. 16 and 21, said township and range; thence east one-half mile to the corner common to Secs. 15, 16, 21, and 22, said township and range; thence north one mile to the corner common to Secs. 9, 10, 15, and 16, said township and range; thence east one-half mile to the quarter section corner between said Secs. 10 and 15; thence north one and one-half miles to the center of Sec. 3, said township and range; thence east one mile to the center of Sec. 2, said township and range; thence north one-half mile, more or less, to the quarter section corner on the north boundary of said Sec. 2; thence east on the township line to the quarter section corner on the south boundary of Sec. 35, T. 26 N., R. 5 E., M. D. B. & M.; thence north one mile to the quarter section corner between Secs. 26 and 35, said township and range; thence east one-half mile to the corner common to Secs. 25, 26, 35, and 36, said township and range; thence north one mile to the corner common to Secs. 23, 24, 25, and 26, said township and range; thence west one-half mile to the quarter section corner between said Secs. 23 and 26;
Thence north one and one-half miles to the center of Sec. 14, said township and range; thence west one-half mile to the quarter section corner between Secs. 14 and 15, said township and range; thence north one-half mile to the corner common to Secs. 10, 11, 14, and 15, said township and range; thence west one mile to the corner common to Secs. 9, 10, 15, and 16, said township and range; thence north two and one-half miles to the quarter section corner between Secs. 33 and 34, T. 27 N., R. 5 E., M. D. B. & M.; thence west one and three-quarters miles, more or less, to the Chico and Humboldt road at the corner common to Plumas, Butte, and Tehama; thence southwesterly on the southeasterly line of Tehama to the southeast corner of Tehama, at point of intersections of Rock Creek and the southern line of T. 24 N., M. D. B.; thence west on said township line to the Sacramento River; thence down said river to the southwest corner of the Llano Seco grant; thence northeasterly and southeasterly along the eastern boundary of Glenn to the northeastern corner of Colusa; thence on the Colusa east line, down Butte Creek, to the northwest corner of Sutter; thence east on the north line of Sutter to the Feather River; thence down the Feather River to the place of beginning.
Ca. Gov. Code § 23104