OR Rev Stat § 201.360 (2021)
2021 Oregon Revised Statutes|Volume : 06 - Local Government, Public Employees, Elections|Chapter 201 - Boundaries of Counties|Section 201.360 - Yamhill County.

The boundary of Yamhill County is as follows: (1) Commencing in the middle of the main channel of the Willamette River one mile below the Butte; thence in a direct course due west to the Pacific Ocean; thence south along the coast of the Pacific Ocean to a point due west of George Gay’s house; thence due east to the northwest corner of Polk County, which corner is monumented with an iron pipe and brass cap, as depicted on the county line survey of 2003, which lies on the west boundary of and 62.16 chains southerly from the northwest corner of township 6 south, range 8 west; thence S 89° 53" 34’ E, 4,775.55 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 00" 46’ E, 615.90 feet to an iron pipe and brass cap monument; thence S 89° 46" 31’ E, 14,458.42 feet to an iron pipe and brass cap monument; thence S 89° 29" 17’ E, 1,312.89 feet to an iron pipe and brass cap monument; thence S 89° 58" 22’ E, 7,936.58 feet to an iron pipe and brass cap monument; thence S 89° 56" 52’ E, 9,123.08 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 88° 41" 27’ E, 6,684.99 feet to an iron pipe and brass cap monument; thence S 88° 40" 09’ E, 7,840.11 feet to an aluminum pipe and aluminum cap monument; thence N 89° 33" 19’ E, 8,919.81 feet to a brass cap set in concrete; thence S 89° 53" 46’ E, 6,983.34 feet to a point five links north of a cast iron pyramid monument set in 1890 to denote a reference to the boundary between Polk and Yamhill Counties; thence N 89° 29" 01’ E, 2,258.39 feet to an iron pipe and brass cap monument; thence N 89° 29" 45’ E, 4,479.59 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 51" 36’ E, 5,111.72 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence N 89° 50" 30’ E, 8,340.37 feet to an iron pipe and brass cap monument; thence N 89° 51" 31’ E, 6,113.50 feet to an iron pipe and brass cap monument; thence N 89° 52" 12’ E, 4,379.73 feet to an iron pipe and brass cap monument; thence N 89° 53" 01’ E, 4,749.60 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 21" 07’ E, 13,631.79 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 52" 16’ E, 9,925.57 feet to an iron pipe and brass cap monument; thence S 89° 41" 16’ E, 2,708.54 feet to an iron pipe and brass cap monument; thence S 89° 40" 14’ E, 2,690.80 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence N 89° 53" 16’ E, 6,000.53 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 52" 36’ E, 1,131.35 feet to an iron pipe and brass cap monument; thence S 89° 54" 09’ E, 891.58 feet to an iron pipe and brass cap monument; thence S 89° 59" 32’ E, 3,487.12 feet to an iron pipe and brass cap monument; thence S 89° 59" 01’ E, 3,093.00 feet to an aluminum pipe and aluminum cap monument; thence S 89° 48" 05’ E, 1,314.22 feet to an iron pipe and brass cap monument; thence S 89° 51" 52’ E, 14,356.78 feet to a cast iron pyramid monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 42" 43’ E, 5,256.03 feet to a brass cap set in the base of the monument set in 1890 to denote the boundary between Polk and Yamhill Counties; thence S 89° 42" 43’ E, 900 feet to the middle of the main channel of the Willamette River, at a point in the Willamette River, leaving Gay’s house in Yamhill County; thence down the channel to the place of beginning. (2) The boundaries of Yamhill and Washington Counties begin at the center of the main channel of the Willamette River at its intersection with the meridian line; thence north to the northeast corner of section 13, township 3 south, range 1 west; thence two miles west; one mile north; one mile west; one mile north; two miles west; one mile south; three miles west; one mile north; three miles west; one mile north; one mile west; one mile north; one mile west; one mile north; one mile west; one mile north; thence west on the section line to center of Wapatoo Lake; thence down the center of the lake to its intersection with the south line of township 1 south; thence west on the township line to the summit of the Coast Mountains. (3) The boundary line between Yamhill and Tillamook Counties commences at the northwest corner of section 5, township 2 south of range 6 west, Willamette Meridian; thence south 15 miles along east lines of sections 6, 7, 18, 19, 30 and 31 of township 2 south, range 6 west, sections 6, 7, 18, 19, 30 and 31 of township 3 south, range 6 west and sections 6, 7 and 18, township 4 south, range 6 west, Willamette Meridian to the southeast corner of section 18, township 4 south, range 6 west; thence west 16 miles along the east-west centerline of township 4 south, range 6 west, township 4 south, range 7 west, township 4 south, range 8 west and township 4 south, range 9 west to the center of township 4 south, range 9 west, Willamette Meridian; thence south nine and three-fourths miles along the north-south centerline of township 4 south, range 9 west, township 5 south, range 9 west and township 6 south, range 9 west to the northwest corner of the southwest quarter of the southwest quarter of section 3, township 6 south, range 9 west, Willamette Meridian; thence east three miles along the north line of the south one-half of the south one-half of sections 3, 2 and 1 to the northeast corner of the southeast quarter of the southeast quarter of section 1, township 6 south, range 9 west, Willamette Meridian. [Amended by 1981 c.332 §3; 2003 c.97 §2]