(a) All that portion of Oregon lying south of Marion County and east of Benton County.

(b) The southern boundary of Linn County is as follows: Beginning in the middle of the main channel of the Willamette River, due west from where the south line of section 3, township 16 south, range 4 west intersects the river; running thence east on the section line to the southwest corner of section 2, township 16 south, range 2 west; thence north on the section line to the northwest corner of section 23, township 15 south, range 2 west; thence east on the section line to the northeast corner of section 24, township 15 south, range 2 west; thence north on the township line between township 15 south, range 1 west, and township 15 south, range 2 west, to the summit of the ridge dividing the waters of the tributaries of the Calapooia River from the waters of the tributaries of the Mohawk River; thence easterly along the summit of the ridge dividing the waters of the Calapooia River and its tributaries from the waters of the tributaries of the Mohawk River and the tributaries of the McKenzie River to where the same intersects the west line of section 35, township 15 south, range 3 east; thence north to the southwest corner of the northwest quarter of the northwest quarter of section 35; thence east to the east line of section 35; thence south to the quarter section corner between sections 35 and 36; township 15 south, range 3 east; thence east to the east line of section 36; thence south to the summit dividing the waters of Calapooia River from the waters of the tributaries of the McKenzie River; thence easterly along the summit of the ridge to the intersection of the summit with the present southern boundary of Linn County, in township 15 south, range 4 east; thence east along the present boundary line between the counties to the summit of the Cascade Mountains.

(2) When the Willamette River serves as the boundary between Linn and Lane Counties in subsection (1)(b) of this section, a reference to the river refers to the middle of the Willamette River as it existed on January 8, 2003, and may be further identified using coordinates and other location information determined by the affected county surveyors and filed by the appropriate counties with the appropriate county assessors and the Department of Revenue under ORS 308.225. [Amended by 2003 c.622 §3]

Note: In addition to the boundary described in 201.220, the eastern boundary of Linn County is the summit of the Cascade Range adjacent to parts of the western boundaries of Deschutes (see 201.090) and Jefferson (see 201.160) Counties. The northern boundary of Linn County is the southern boundary of Marion County (see 201.240). The western boundary of Linn County is the Willamette River adjacent to parts of the eastern boundaries of Benton (see 201.020) and Polk (see 201.270) Counties.

For description of area removed from Linn County and annexed to Lane County, see 201.200.