The following is a list of interlocked railroad crossings in St. Clair County:
| Name | Town | Railroads | Building | Type | Notes |
| 16th Street Tower | Port Huron | GT | Tower | Junction | |
| Black River Bridge | Port Huron | PM/Black River | Tower | Bascule bridge | |
| Fort Gratiot Bridge | Fort Gratiot | GT/Black Ricer | Tower/Booth | Bascule bridge | |
| Tappan Tower | Port Huron | GT/DGH&M/PM | Tower | ||
The following sources are utilized in this website. [SOURCE-YEAR-MMDD-PG]:
