| Year | Colorado eastern slope |
Southwestern Colorado | Northwestern Colorado | Wyoming | Area (ha) | SDD (m) | Area (ha) | SDD (m) | Area (ha) | SDD (m) | Area (ha) | SDD (m) |
| 1994 | 7,135 | 903 | 702 | 1,996 | 0 | — | 0 | — | 1995 | 416 | 3,601 | 325 | 4,499 | 15 | — | 1,717 | 3,097 | 1996 | 290 | 1,037 | 2,227 | 1,288 | 5,607 | — | 490 | 656 | 1997 | 528 | 1,102 | 1,004 | 381 | 3 | — | 1,052 | 525 | 1998 | 3,843 | 2,718 | 1,218 | — | 255 | 204 | 214 | 667 | 1999 | 1,848 | 1,993 | 482 | 509 | 57 | 258 | 1,912 | 410 | 2000 | 2,174 | 1,680 | 3,030 | 792 | 172 | 342 | 2,977 | 1,542 | 2001 | 2,605 | 2,717 | 809 | 736 | 340 | 1,521 | 4,765 | 2,863 | 2002 | 2,350 | — | 3,312 | 1,770 | 175 | 535 | 10,970 | 894 | 2003 | 6,302 | 1,897 | 11,728 | 873 | 1,501 | 644 | 7,242 | 2,287 | 2004 | 7,304 | 1,641 | 8,869 | 2,486 | 1,049 | 2,532 | 27,571 | 3,739 | 2005 | 3,214 | 3,693 | 7,551 | 672 | 1,274 | — | 67,744 | 10,605 | 2006 | 4,644 | 970 | 5,630 | 2,389 | 3,233 | 1,384 | 6,754 | 1,008 | 2007 | 2,348 | 1,281 | 12,678 | 1,949 | 4,664 | 1,413 | 24,053 | 871 | 2008 | 555 | 3,530 | 8,122 | 804 | 2,711 | 315 | 8,535 | 3,817 | 2009 | 2,187 | 1,304 | 6,317 | 762 | 760 | 564 | 1,448 | 7,599 | 2010 | 5,108 | 2,124 | 8,983 | 708 | 757 | 601 | 2,938 | 2,030 |
| Avg
| 3,109 | 2,012 | 4,882 | 1,390 | 1,328 | 859 | 10,022 | 2,663 |
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