---
kind: "section"
citation: "27 C.F.R. § 9.166"
title: "27"
number: "9.166"
heading: "Diamond Mountain District."
url: "https://uscodex.org/cfr/27/9.166"
---

# §9.166. Diamond Mountain District.

- (a) **Name.** The name of the viticultural area described in this section is “Diamond Mountain District.”
- (b) **Approved map.** The appropriate maps for determining the boundary of the Diamond Mountain District viticultural area are two 1:24,000 Scale U.S.G.S. topography maps. They are titled:
  - (1) Mark West Springs, CA 1993
  - (2) **Calistoga, CA 1993.**
- (c) **Boundaries.** The viticultural area is located in Napa County, California. The beginning point is where the boundary between Napa and Sonoma counties intersects Petrified Forest Road in [Section 3](/cfr/27/3.md) of Township 8 North, Range 7 West, Mount Diablo Base and Meridian on the Mark West Springs map;
  - (1) Then north and east along Petrified Forest Road approximately 1.9 miles to the point where it intersects the 400-foot contour just east of [Section 35](/cfr/27/35.md) of Township 9 North, Range 7 West, Mount Diablo Base and Meridian, in the Mallacomes land grant;
  - (2) Then generally east southeast along the 400-foot contour approximately 6.5 miles to the point where it intersects Ritchey Creek in [Section 3](/cfr/27/3.md) of Township 8 North, Range 6 West, Mount Diablo Base and Meridian;
  - (3) Then west southwest along Ritchey Creek approximately 2.2 miles to the point where it intersects the boundary between Sections [17](/cfr/27/17.md) and [20](/cfr/27/20.md) of Township 8 North, Range 6 West, Mount Diablo Base and Meridian;
  - (4) Then due west in a straight line along the section boundary approximately 0.8 miles to the point where it intersects the boundary between Napa and Sonoma Counties between Sections [18](/cfr/27/18.md) and [19](/cfr/27/19.md) of Township 8 North, Range 6 West, Mount Diablo Base and Meridian;
  - (5) Then generally northwest along the boundary between Napa and Sonoma Counties approximately 4.2 miles to the point where it intersects Petrified Forest Road, to the point of beginning.

## Notes

### Amendments

[T.D. ATF-456, 66 FR 29698, June 1, 2001]

### Authority

Authority: 27 U.S.C. 205.

### Source

Source: T.D. ATF-60, 44 FR 56692, Oct. 2, 1979, unless otherwise noted.

### Amendments

[T.D. ATF-456, 66 FR 29698, June 1, 2001]