(a) Name. The name of the viticultural area described in this section is “Umpqua Valley.”

(b) Approved maps. The appropriate maps for determining the boundaries of the Umpqua Valley viticultural area are two U.S.G.S. maps. They are titled:

(1) “Roseburg,” scale 1:250,000 (1958, revised 1970); and

(2) “Medford,” scale 1:250,000 (1955, revised 1976).

(c) Boundaries. The Umpqua Valley viticultural area is located entirely within Douglas County, Oregon, which is in the southwest part of the State. The beginning point is the intersection of Interstate Highway 5 with the Douglas/Lane County line in Township 21 South (T21S), Range 4 West (R4W) on the “Roseburg” map.

(1) From the beginning point, the boundary proceeds north along the Douglas/Lane County line approximately .5 miles to the 1,000-foot contour line;

(2) Thence northwest along the 1,000-foot contour line to the Douglas/Lane County line; thence west along the Douglas/Lane County line approximately 2.5 miles, returning to the 1,000-foot contour line; thence in a generally westerly direction along the 1,000-foot contour line to the R9W/R10W range line;

(3) Thence south along the R9W/R10W range line approximately 2.75 miles to the center of the Umpqua River; thence along a straight line in an easterly direction approximately 6.25 miles to the intersection of range line R8W/R9W with the center of the Umpqua River; thence south along range line R8W/R9W approximately 3.5 miles to its intersection with township line T22S/T23S;

(4) Thence southeast approximately 8.5 miles along a straight line to the intersection of township line T23S/T24S with range line R7W/R8W; thence south along the R7W/R8W range line approximately 8 miles to its intersection with the 1,000-foot contour line; thence in a southeasterly direction in a straight line approximately 3.5 miles toward the intersection of township line T25S/T26S with range line R6W/R7W, returning to the 1,000-foot contour line;

(5) Thence in a southerly direction along the 1,000-foot contour line to the intersection of township line T27S/T28S with range line R7W/R8W; thence in a southwesterly direction in a straight line approximately 3.5 miles toward the intersection of township line T28S/T29S with range line R8W/R9W, returning to the 1,000-foot contour line; thence south along the 1,000-foot contour line to its intersection with township line T29S/T30S;

(6) Thence east along township line T29S/T30S approximately .33 miles, rejoining the 1,000-foot contour line; thence in a northerly and eventually a southerly direction along the 1,000-foot contour line past the town of Riddle on the “Medford” map to range line R6W/R7W; thence south along the R6W/R7W range line approximately .5 miles back to the 1,000-foot contour line;

(7) Thence in an easterly, westerly, and eventually a northerly direction along the 1,000-foot contour line to a point approximately 3.5 miles east of Dillard, where the contour line crosses Interstate Highway 5 on the “Roseburg” map; thence northeast along Interstate Highway 5 approximately .25 mile, returning to the 1,000-foot contour line; thence in a generally northeasterly, southeasterly, northwesterly, and eventually a northeasterly direction along the 1,000-foot contour line past the town of Idleyld Park to the R2W/R3W range line;

(8) Thence north along range line R2W/R3W approximately 1.75 miles to the T25S/T26S township line; thence west along township line T25S/T26S approximately .25 mile, returning to the 1,000-foot contour line; thence in a generally westerly and then a northerly direction along the 1,000-foot contour line up the valley of Calapooya Creek to the R3W/R4W range line; thence north along range line R3W/R4W approximately 2.25 miles, back to the 1,000-foot contour line;

(9) Thence in a westerly and then a northerly direction along the 1,000-foot contour line to the T23S/T24S township line; thence east along the T23S/T24S township line approximately 2.75 miles to the 1,000-foot contour line; thence in a northerly direction along the 1,000-foot contour line to its intersection with the Douglas/Lane County line; thence north along the Douglas/Lane County line approximately .75 mile to the point of beginning.