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

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

(1) Lakeport, 1958; photorevised 1978; minor revision 1994;

(2) Upper Lake, 1996;

(3) Bartlett Mountain, 1996; and

(4) Lucerne, 1996.

(c) Boundary. The Upper Lake Valley viticultural area is located in Lake County, California. The boundary of the Upper Lake Valley viticultural area is as described as follows:

(1) The beginning point is on the Lakeport map at the intersection of Lyons Creek and the western shore of Clear Lake in Section 31, T15N/R9W. From the beginning point, proceed south in a straight line to an unnamed light-duty road known locally as Lafferty Road; then

(2) Proceed west along Lafferty Road to its intersection with an unnamed secondary highway known locally as Lakeshore Boulevard; then

(3) Proceed north on Lakeshore Boulevard to its intersection with an unnamed light-duty road known locally as Whalen Way; then

(4) Proceed west on Whalen Way to its intersection with State Highway 29; then

(5) Proceed north on State Highway 29, crossing onto the Upper Lake map, to the intersection of the highway and the southern boundary of Section 13, T15N, R10W; then

(6) Proceed west along the southern boundary of Sections 13 and 14 to the intersection of the southern boundary of Section 14 with the 1,600-foot elevation contour; then

(7) Proceed in a generally northwesterly direction along the meandering 1,600-foot elevation contour to its intersection with an unnamed, unimproved road in Section 17, T15N/R10W; then

(8) Proceed north in a straight line, crossing Scotts Creek, to the 1,600-foot elevation contour in Section 8, T15N/R10W; then

(9) Proceed northeasterly, then southeasterly along the 1,600-foot elevation contour to its intersection with an unnamed 4-wheel drive road in Section 9, T15N/R10W; then

(10) Proceed northwest in a straight line to the marked 2,325-foot elevation point on Hell's Peak; then

(11) Proceed southeast in a straight line to the intersection of the 1,600-foot elevation contour and the southern boundary of Section 30 along the Mendocino National Forest boundary, T16N/R9W; then

(12) Proceed southeast along the meandering 1,600-foot elevation contour to its third intersection with the Mendocino National Forest boundary, along the eastern boundary of Section 31, T16N/R9W; then

(13) Proceed south, then west along the Mendocino National Forest boundary to its intersection with the 1,600-foot elevation contour along the northern boundary of Section 5, T15N/R9W; then

(14) Proceed southeasterly along the meandering 1,600-foot elevation contour, crossing onto the Bartlett Mountain map, to the intersection of the 1,600-foot elevation contour and the Mendocino National Forest boundary along the eastern boundary of Section 9, T15N/9RW; then

(15) Proceed south, then east along the Mendocino National Forest boundary to its intersection with the 1,600-foot elevation contour along the northern boundary of Section 15, T15N/R9W; then

(16) Proceed south, then northwest along the meandering 1,600-foot elevation contour, crossing onto the Upper Lake map, and continuing southeasterly along the 1,600-foot elevation contour crossing back and forth between the Bartlett Mountain map and the Upper Lake map, to the intersection of the 1,600-foot elevation contour and an unimproved 4-wheel drive road in Section 21, T15N/R9W; then

(17) Continue southeast along the 1,600-foot elevation contour, crossing onto the Lucerne map, to the intersection of the 1,600-foot elevation contour and an unimproved 4-wheel drive road in Section 36, T15N/R9W; then

(18) Proceed south in a straight line to the shoreline of Clear Lake; then

(19) Proceed northeasterly along the shoreline of Clear Lake, crossing onto the Lakeport map, and continuing southwesterly along the shoreline, crossing Rodman Slough, to return to the beginning point.