| Designated area
| Designation
| Classification
|
|---|
| Date
| Type
| Date
| Type
|
|---|
| Archuleta County
| | | | |
| Pagosa Springs Area | 8/14/2001 | Attainment
| | |
| Township 35N-Range 2W: Sections 13, 14, 15; Section 23 NE, N
1/2 SE; Section 24 all except SWSW; Section 25 N
1/2NE, NENW.
| | | | |
| Township 35N-Range 1W: Section 18 W
1/2
| | | | |
| Adams, Denver, and Boulder Counties
| | | | |
| Denver Metropolitan area | 10/16/2002 | Attainment
| | |
| All of Denver, Jefferson, and Douglas Counties, Boulder County (excluding the Rocky Mountain National Park) and the Colorado automobile inspection and readjustment program portions of Adams and Arapahoe Counties
| | | | |
| San Miguel County
| | | | |
| Telluride | 8/14/2001 | Attainment
| | |
| The Telluride attainment/maintenance area begins at the intersection of Colorado State Highway 145 and the Telluride service area boundary, as it existed in 1991. The western edge of the nonattainment area until it meets Remine Creek is defined as follows: A tract of land located in a portion of the west one-half of Section 28 and the east one-half of Section 29, Township 43 North, Range 9 west, of New Mexico Principal Meridian, County of San Miguel, State of Colorado, described as follows: Beginning at the southwest corner of the said Section 28; Thence N 89 deg.36′00″ W. 292.70 Feet; Thence S 04 deg.05′12″ W. 538.63 Feet; Thence N 03 deg.29′42″ W. 780.19 Feet; Thence N 22 deg.15′00″ E. 3344.16 Feet; Thence S 51 deg.51′49″ E. 570.44 Feet; Thence S 03 deg.15′36″ E. 1106.22 Feet; Thence S 45 deg.24′42″ E. 546.96 Feet; Thence S 28 deg.41′12″ W. 549.62 Feet; Thence S 29 deg.40′09″ E. 169.68 Feet; Thence S 44 deg.30′03″ W. 649.51 Feet; Thence S 85 deg.54′00″ E. 660.00 Feet; Thence S 04 deg.06′00″ W. 660.00 Feet; Thence N 89 deg.56′00″ E. 1318.68 Feet; to the true point of beginning containing 11249 acres as described above. Then, at Remine Creek, the attainment/maintenance boundary follows the service area boundary for 9.65 miles to the 9,200 foot contour line. The boundary then intersects Bear Creek. Here the attainment/maintenance boundary diverges from the service area boundary (9,200 foot contour line). The attainment/maintenance boundary continues in a west, southwest direction for 0.92 miles from the intersection of the 9,200 foot contour line and Bear Creek to the top of ski lift number 9 in the Telluride Ski Area at an elevation of about 11,900 feet. The boundary then shifts and runs in a north-westerly direction for 0.83 miles from the top of lift 9 to the top of lift 7, which is located at an elevation of 10,490 feet. From the top of lift 7, the attainment/maintenance boundary continues in a north-westerly direction for 0.5 miles to the intersection of lift 3 with the 10,000 foot control line. The attainment/maintenance boundary follows the 10,000 foot contour line in a south, south-west direction for 3.2 miles, until it intersects Skunk Creek. Here the boundary diverges from the 10,000 foot contour line and follows Skunk Creek in a northerly direction for 2.25 miles. At the intersection of Skunk Creek and Colorado State Highway 145, the attainment/maintenance boundary leaves the creek and follows Highway 145 in a northerly direction until it meets the service area boundary as it existed prior to changes adopted in 1991.
| | | | |
| Prowers County
| | | | |
| Lamar | 12/27/2005 | Attainment | | |
| Pitkin County:
| | | | |
| Aspen/Pitkin County Area—The area encompassed by the following Parcel ID numbers, as defined by the Pitkin County Planning Department: 2337-29, 2737-28, 2737-21, 2737-20, 2737-19, 2737-18, 2737-17, 2737-08, 2737-07, 2737-06, 2735-22, 2735-15, 2735-14, 2735-13, 2735-12, 2735-11, 2735-10, 2735-03, 2735-02, 2735-01, 2641-31, 2643-36, 2643-35, 2643-34, 2643-27, 2643-26 | 7/14/2003 | Attainment.
| | |
| Fremont County
| | | | |
| Canon City Area | 7/31/2000 | Attainment
| | |
| Township 18S—Range 70W: All of sections 21, 22, 27, 28, 33, and 34; the E
1/2, NENW, NESW, SENW, SESW quarters of sections 20, 29, 32; and the W
1/2 of sections 23, 26, and 35; Township 19S—Range 70W: All of sections 3, 4, 9, 10; E
1/2, NENW, NESW, SENW, SESW quarters of sections 5 and 8; W
1/2 of sections 2 and 11.
| | | | |
| Routt County (part):
| | | | |
| Steamboat Springs | 11/24/2004 | Attainment.
| | |
| On the East—The Routt National Forest.
| | | | |
| On the South—The southern border of sections 19, 10, 21, T4N, R84W of the 6th P.M. and the southern border of sections 23, 24, T4N, R85W of the 6th P.M.
| | | | |
| On the West—Beginning at the southwestern corner of section 23, T4N, R85W of the 6th P.M. North along the western border of sections 23, 14, 11, T4N, R85W. Thence, along the ridge which bisects sections 35, 36, 25, 24, 13, 14, 11, 12, 1, T5N, R85W, and sections 36, 25, 24, T6N, R85W. Thence heading northwest along the ridge which bisects sections 23, 15, 10, 9, 4, T6N, R85W of 6th P.M. Thence, heading northeast along the ridge which bisects sections 33, 34, 35, 36, 25, T7N, R85W and sections 30 and 10 of T7N, R84W. Thence, north along the N 1/2 of the western edge of section 19, to the NW corner of section 18, T7N, R84W.
| | | | |
| On the North—The northern boundary of sections 16, 17, 18, T7N, R84W of 6th P.M.
| | | | |
| AQCR 1 | 11/15/1990 | Unclassifiable
| | |
| AQCR 2 | 11/15/1990 | Unclassifiable
| | |
| AQCR 3 (excluding the Denver Metropolitan PM-10 nonattainment area) | 11/15/1990 | Unclassifiable
| | |
| AQCR 4 | 11/15/1990 | Unclassifiable
| | |
| AQCR 5 | 11/15/1990 | Unclassifiable
| | |
| AQCR 6 (excluding the Lamar PM-10 nonattainment area) | 11/15/1990 | Unclassifiable
| | |
| AQCR 7 | 11/15/1990 | Unclassifiable
| | |
| AQCR 8 | 11/15/1990 | Unclassifiable
| | |
| AQCR 9 (excluding the Pagosa Springs PM-10 nonattainment area) | 11/15/1990 | Unclassifiable
| | |
| AQCR 10 (excluding the Telluride PM-10 nonattainment area) | 11/15/1990 | Unclassifiable
| | |
| AQCR 11 | 11/15/1990 | Unclassifiable
| | |
| AQCR 12 (excluding the Aspen/Pitkin County and Steamboat Springs Area Airshed PM-10 nonattainment areas) | 11/15/1990 | Unclassifiable
| | |
| AQCR 13 (excluding the Canon City PM-10 nonattainment area) | 1/15/1990 | Unclassifiable | | |