Layer Estimates:

Layer: Crossings (ID:0)
Count: 12546
Extent:

XMin: -7918729.44883068
YMin: 5322453.66225295
XMax: -7445088.41124835
YMax: 6001008.43883926
Spatial Reference: 102100 (3857)

Layer: Dams (ID:1)
Count: 1120
Extent:

XMin: -7905928.0073
YMin: 5326703.3211
XMax: -7460200.4419
YMax: 5999025.2571
Spatial Reference: 102100 (3857)

Layer: Natural_Barriers (ID:4)
Count: 357
Extent:

XMin: -7906764.1405
YMin: 5395109.2528
XMax: -7480124.1578
YMax: 5999014.9659
Spatial Reference: 102100 (3857)