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

(b) Approved maps. The 13 United States Geological Survey (USGS) 1:100,000 scale topographic maps used to determine the boundary of the Loess Hills District viticultural area are titled:

(1) Rock Rapids, Iowa-South Dakota, 1985;

(2) Sioux City North, Iowa-South Dakota-Nebraska, 1986; photoinspected 1990;

(3) Storm Lake, Iowa, 1985; photoinspected 1990;

(4) Ida Grove, Iowa, 1985; photoinspected 1990;

(5) Carroll, Iowa, 1993;

(6) Guthrie Center, Iowa, 1993;

(7) Creston, Iowa, 1993;

(8) Omaha, Nebraska-Iowa, 1985; photoinspected, 1990;

(9) Nebraska City, Nebraska-Iowa-Missouri, 1993;

(10) Falls City, Nebraska-Missouri, 1986; photoinspected 1991;

(11) Harlan, Iowa-Nebraska, 1980;

(12) Blair, Nebraska-Iowa, 1986; photoinspected 1988; and

(13) Sioux City South, Iowa-Nebraska-South Dakota, 1986; photoinspected 1990.

(c) Boundary. The Loess Hills District viticultural area is located in Fremont, Page, Mills, Montgomery, Pottawattamie, Cass, Harrison, Shelby, Audubon, Monona, Crawford, Carroll, Woodbury, Ida, Sac, Plymouth, and Sioux Counties in western Iowa and Atchison and Holt Counties in northwestern Missouri. The boundary of the Loess Hills District viticultural area is as described below:

(1) The beginning point is on the Rock Rapids, Iowa-South Dakota map, in Sioux County, Iowa, at the intersection of the Big Sioux River and an unnamed road known locally as County Road B30 (360th Street), east of Hudson, South Dakota. From the beginning point, proceed east on County Road B30 approximately 3 miles to a road known locally as County Road K22 (Coolidge Avenue); then

(2) Proceed south on County Road K22 approximately 3 miles to a road known locally as County Road B40 (390th Street); then

(3) Proceed east on County Road B40 approximately 4 miles to a road known locally as County Road K30 (Eagle Avenue); then

(4) Proceed south on County Road K30 approximately 13.1 miles, crossing onto the Sioux City North, Iowa-South Dakota-Nebraska map and continuing into Plymouth County, Iowa, to a road known locally as County Road C12 (110th Street), at Craig, Iowa; then

(5) Proceed east on County Road C12 approximately 2 miles to a road known locally as County Road K42 (Jade Avenue), at the marked 436-meter elevation point; then

(6) Proceed south on County Road K42 approximately 10 miles to a road known locally as County Road C38; then

(7) Proceed east on County Road C38 approximately 6.4 miles to a road known locally as County Road K49 (7th Avenue SE), approximately 2 miles south of La Mars, Iowa; then

(8) Proceed south on County Road K49 approximately 4 miles to a road known locally as County Road C44 (230th Street); then

(9) Proceed east on County Road C44 approximately 5 miles to a road known locally as County Road K64 (Oyens Avenue); then

(10) Proceed south on County Road K64 approximately 4.1 miles to a road known locally as County Road C60 (290th Street); then

(11) Proceed east on County Road C60 approximately 5 miles, crossing onto the Storm Lake, Iowa map, to State Highway 140; then

(12) Proceed south on State Highway 140 approximately 3.2 miles to a road known locally as County Road L14 (Knox Avenue) in Kingsley, Iowa; then

(13) Proceed south on County Road L14 approximately 2.7 miles, crossing into Woodbury County, Iowa, to a road known locally as County Road D12 (110th Street); then

(14) Proceed east on County Road D12 approximately 5 miles to a road known locally as County Road L25 (Minnesota Avenue) near Pierson, Iowa; then

(15) Proceed south on County Road L25 approximately 4.5 miles, crossing onto the Ida Grove, Iowa map, to U.S. Highway 20; then

(16) Proceed east on U.S. Highway 20 approximately 22.5 miles, crossing into Ida County, Iowa, to a road known locally as County Road M25 (Market Avenue); then

(17) Proceed south on County Road M25 approximately 9.8 miles to State Highway 175 east of Ida Grove, Iowa; then

(18) Proceed east on State Highway 175 approximately 4.1 miles to a road known locally as Country Highway M31 (Quail Avenue) near Arthur, Iowa; then

(19) Proceed south on Country Highway M31 approximately 4.4 miles to a road known locally as County Road D59 (300th Street); then

(20) Proceed east on County Road D59 approximately 13 miles, crossing into Sac County, Iowa, to a road known locally as County Road M64 (Needham Avenue/Center Street) at Wall Lake, Iowa; then

(21) Proceed south on County Road M64 approximately 6.2 miles to a road known locally as County Road E16 (120th Street); then

(22) Proceed east into Carroll County, Iowa, on County Road E16 approximately 6 miles, crossing onto the Carroll, Iowa map, to Breda, Iowa, and then continue east on State Highway 217 (East Main Street) approximately 5 miles to U.S. Highway 71; then

(23) Proceed south on U.S. Highway 71 approximately 3 miles to a road known locally as County Road E26 (140th Street); then

(24) Proceed east on County Road E26 approximately 5 miles to a road known locally as County Road N38 (Quail Avenue); then

(25) Proceed south on County Road N38 approximately 5 miles to U.S. Highway 30 (Lincoln Highway); then

(26) Proceed east on U.S. Highway 30 approximately 3 miles to a road known locally as County Road N44 (Colorado Street) in Glidden, Iowa; then

(27) Proceed south on County Road N44 approximately 8 miles, crossing onto the Guthrie Center, Iowa map, to a road known locally as County Road E57 (280th Street); then

(28) Proceed east on County Road E57 approximately 2 miles to a road known locally as County Road N44 (Velvet Avenue); then

(29) Proceed south on County Road N44 approximately 5.4 miles to State Highway 141 (330th Street) at Coon Rapids, Iowa; then

(30) Proceed west on State Highway 141 approximately 12 miles to U.S. Highway 71 at Lynx Avenue southeast of Templeton, Iowa; then

(31) Proceed south on U.S. Highway 71 approximately 35.9 miles, crossing into Audubon County, Iowa, and then Cass County, Iowa, and onto the Creston, Iowa map, to U.S. Highway 6/State Highway 83 east of Atlantic, Iowa; then

(32) Proceed west, then southwest, then west on U.S. Highway 6 approximately 18.9 miles, crossing onto the Omaha, Nebraska-Iowa map and into Pottawattamie County, Iowa, to a road known locally as County Road M47 (500th Street) approximately 1 mile west of Walnut Creek; then

(33) Proceed south on County Road M47 approximately 12 miles, crossing into Montgomery County, Iowa to a road known locally as County Road H12 (110th Street); then

(34) Proceed west on County Road H12 approximately 8.9 miles, crossing into Mills County, Iowa, to U.S. Highway 59; then

(35) Proceed south on U.S. Highway 59 approximately 20.2 miles, crossing onto the Nebraska City, Nebraska-Iowa-Missouri map and into Page County, Iowa, to a road known locally as County Road J14 (130th Street); then

(36) Proceed east on County Road J14 approximately 4 miles to a road known locally as County Road M41 (D Avenue); then

(37) Proceed south on County Road M41 approximately 1.7 miles to State Highway 48 at Essex, Iowa; then

(38) Proceed northeast then east on State Highway 48 approximately 1.2 miles to a road known locally as County Road M41 (E Avenue); then

(39) Proceed south on County Road M41 approximately 7 miles to State Highway 2 (210th Street); then

(40) Proceed east on State Highway 2 approximately 8 miles to a road known locally as M Avenue; then

(41) Proceed south on M Avenue, then east on a road known locally as County Road M60 (Maple Avenue), approximately 6.4 total miles, to a road known locally as County Road J52 (270th Street); then

(42) Proceed south in a straight line approximately 3.5 miles to the intersection of 304th Street and Maple Avenue (approximately 1.2 miles southwest of College Springs, Iowa), and then continue south on Maple Avenue for 0.5 mile to a road known locally as County Road J64 (310th Street); then

(43) Proceed west on County Road J64 approximately 4.5 miles to a road known locally as County Road M48 (Hackberry Avenue); then

(44) Proceed south on County Road M48 approximately 1.2 miles to the Iowa-Missouri State line at Blanchard, Iowa, and, crossing into Atchison County, Missouri, where County Road M48 becomes State Road M, and continue generally south on State Road M approximately 11.2 miles, crossing onto the Falls City, Nebraska-Missouri map, to U.S. Highway 136; then

(45) Proceed west on U.S. Highway 136 approximately 1 mile to State Road N; then

(46) Proceed south on State Road N 15 miles, crossing into Holt County, Missouri, to State Road C; then

(47) Proceed west then south on State Road C approximately 3 miles to U.S. Highway 59; then

(48) Proceed northwest on U.S. Highway 59 approximately 2 miles to the highway's first intersection with Interstate Highway 29 near Craig, Missouri; then

(49) Proceed generally north along Interstate Highway 29, crossing into Atchison County, Missouri, and onto the Nebraska City, Nebraska-Iowa-Missouri map, and continuing into Freemont County and Mills County, Iowa, then crossing onto the Omaha, Nebraska-Iowa map and into Pottawattamie County, Iowa; then crossing onto the Harlan, Iowa-Nebraska map and into Harrison County, Iowa; then continuing onto the Blair, Nebraska-Iowa map and into Monona County, Iowa; then crossing onto the Sioux City South, Iowa-Nebraska-South Dakota Map and into Woodbury County for a total of approximately 185 miles, to the intersection of Interstate Highway 29 with the Big Sioux River at Sioux City, Iowa; then

(50) Proceed generally north (upstream) along the meandering Big Sioux River, crossing onto the Sioux City North, Iowa-South Dakota-Nebraska map and into Plymouth County and Sioux County, Iowa, and continuing onto the Rock Rapids, Iowa-South Dakota map for a total of approximately 50 miles, returning to the beginning point.