Layer Estimates:

Layer: Upper Los Angeles River (ID:1)
Count: 15
Extent:

XMin: -13210830.9349224
YMin: 4035907.87692993
XMax: -13160656.146669
YMax: 4055060.49179431
Spatial Reference: 102100 (3857)

Layer: Lower Los Angeles River (ID:2)
Count: 7
Extent:

XMin: -13161287.1627712
YMin: 3996781.40382658
XMax: -13154524.4451274
YMax: 4039423.0002519
Spatial Reference: 102100 (3857)