Layer Estimates:

Layer: counties (ID:0)
Count: 77
Extent:

XMin: 139982.3589
YMin: 4094070.2505
XMax: 763218.6879
YMax: 4546717.9995
Spatial Reference: 26913 (26913)

Layer: AIRPORTS (ID:1)
Count: 80
Extent:

XMin: 157422.711
YMin: 4115232.038
XMax: 753019.602
YMax: 4538990.004
Spatial Reference: 26913 (26913)

Layer: highways (ID:2)
Count: 17104
Extent:

XMin: 140656.2344
YMin: 4094297.5
XMax: 761615.75
YMax: 4542837.5
Spatial Reference: 26913 (26913)

Layer: Colorado_Census_Tracts (ID:3)
Count: 1075
Extent:

XMin: 138614.365950424
YMin: 4094032.28183646
XMax: 763292.220917265
YMax: 4547085.54912951
Spatial Reference: 26913 (26913)