Table 1. Anthropogenic structures.
Total number or length of vertical anthropogenic structures present in the lesser prairie-chicken Sand Sagebrush Prairie Ecoregion (640,763 ha focal area plus 16-km buffer [36]) of southwest Kansas, southeast Colorado, and northwestern Oklahoma, USA, at 5-year intervals from 1989–2014.
| Year | Oil/Gas Wells | Cell Towers | Wind Turbines | Transmission Lines (km) |
|---|---|---|---|---|
| 1989 | 12,327 | 45 | 0 | 1134.27 |
| 1994 | 15,427 | 58 | 0 | 1552.05 |
| 1999 | 18,301 | 76 | 0 | 1819.00 |
| 2004 | 20,288 | 109 | 112 | 2316.04 |
| 2009 | 21,930 | 145 | 112 | 2443.46 |
| 2014 | 23,167 | 176 | 278 | 2582.06 |