(a) Name. The name of the viticultural area described in this section is “Ancient Lakes of Columbia Valley”. For purposes of part 4 of this chapter, “Ancient Lakes of Columbia Valley” is a term of viticultural significance.

(b) Approved maps. The 12 United States Geological Survey (USGS) 1:24,000 scale topographic maps used to determine the boundary of the Ancient Lakes of Columbia Valley viticultural area are titled:

(1) West Bar, Washington, 1966;

(2) Rock Island Dam, Washington, 1966;

(3) Appledale, Washington, 1966, photoinspected 1976;

(4) Monument Hill, Washington—Grant County, 1966;

(5) Ephrata SW., Washington—Grant County, 1956;

(6) Winchester, Washington—Grant County, 1966;

(7) Winchester SW., Washington—Grant County, 1966, photorevised 1978;

(8) Royal City, Washington—Grant County, provisional edition 1986 (formerly named Smyrna);

(9) Beverly NE., Washington—Grant County, 1965;

(10) Vantage, Washington, 1965, photorevised 1978;

(11) Ginkgo, Washington, 1953, photorevised 1978; and

(12) Cape Horn SE., Washington, 1966, photoinspected 1975.

(c) Boundary. The Ancient Lakes of Columbia Valley viticultural area is located in Douglas, Grant, and Kittitas Counties in central Washington. The boundary of the Ancient Lakes of Columbia Valley viticultural area is as described below:

(1) The beginning point is on the West Bar map where the western shoreline of the Columbia River in Kittitas County intersects with the north boundary line of section 8, T20N/R22E. Proceed east along the section boundaries for approximately 4.35 miles, over the Columbia River and into Douglas County, to the intersection of the line with the Grant and Douglas Counties common boundary line (concurrent with the R22E and R23E common line) at the northwest corner of section 12, T20N/R22E; then

(2) Proceed north along the Grant and Douglas Counties common boundary line for approximately 2.25 miles, onto the Rock Island Dam map, to the northwest corner of section 31, T21N/R23E; then

(3) Proceed east in a straight line along the section boundaries for approximately 12.1 miles, over the Appledale and Monument Hills maps, onto the Ephrata SW map to the intersection of the line with the R24E and R25E common line at the northwest corner of section 36, T21N/R24E; then

(4) Proceed south along the R24E and R25E common line for approximately 22.5 miles, over the Winchester and Winchester SW maps, onto the Royal City map, passing over the West Canal and into the Frenchman Hills, to the southwest corner of section 12, T17N/R24E (concurrent with the intersection of the R24E and R25E common line and a single transmission line); then

(5) Proceed west in a straight line along the section boundaries (marked for 3 sections by the single transmission line) for approximately 4 miles, onto the Beverly NE map, to the southwest corner of section 9, T17N/R24E; then

(6) Proceed north in a straight line along the section boundary for approximately 1 mile to the northwest corner of section 9, T17N/R24E; then

(7) Proceed west in a straight line along the section boundaries for approximately 7.9 miles, onto the Vantage map, crossing over Interstate Route 90 and Columbia River, to the western shoreline of the Columbia River, at Hole in the Wall in Kittitas County, section 6, T17N/R23E; and then

(8) Proceed north along the western shoreline of the meandering Columbia River for approximately 23.3 miles, crossing over the Ginkgo and Cape Horn SE maps, and onto the West Bar map, returning to the beginning point.