Layer Estimates:

Layer: Waterway Mile Marker (ID:0)
Count: 11406
Extent:

XMin: -124.441350467272
YMin: 25.950361791812
XMax: -76.5507786085358
YMax: 46.7031052318751
Spatial Reference: 4326 (4326)

Layer: Principal Port (ID:1)
Count: 150
Extent:

XMin: -166.549916000423
YMin: 17.9786130003905
XMax: -65.836226000229
YMax: 67.7267660001518
Spatial Reference: 4326 (4326)

Layer: Dock (ID:2)
Count: 24024
Extent:

XMin: -178.319529000063
YMin: -14.2833039999788
XMax: 179.132450000069
YMax: 71.292642000329
Spatial Reference: 4326 (4326)

Layer: Lock (ID:3)
Count: 234
Extent:

XMin: -122.614393999583
YMin: 26.7217649998557
XMax: -73.6853229995561
YMax: 47.6657180001865
Spatial Reference: 4326 (4326)

Layer: Waterway Network Node (ID:6)
Count: 6255
Extent:

XMin: -179.312099999915
YMin: -53.0000000000992
XMax: 179.13518999962
YMax: 72.1997200002788
Spatial Reference: 4326 (4326)

Layer: Waterway Network (ID:7)
Count: 6859
Extent:

XMin: -180
YMin: -56.0221463882478
XMax: 180
YMax: 72.1997321458498
Spatial Reference: 4326 (4326)

Layer: Link tonnages (historic) (ID:8)
Count: 2901
Extent:

XMin: -180
YMin: -55.9052119999332
XMax: 180
YMax: 72.1997200002788
Spatial Reference: 4326 (4326)