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Department of Transportation - Division of Maintenance DESCRIPTION UNDER STRUCTURE Structure Maintenance & Investigations (42b) TYPE OF SERVICE UNDER 5-WATERWAY (38) NAVIGATION CONTROL 1: BR PERMIT REQ (69) UNDERCLEARANCES V - H N NOT APPLICABLE (NBI) (111) PIER PROTECTION 1 NOT REQUIRED (71) WATER ADEQUACY 9 ABOVE DESIRABLE (39) NAVIGATION VERTICAL CLEARANCE 6.7 M (61) CHANNEL PROTECTION 7 MINOR DAMAGE (116) VERT-LIFT BRIDGE NAV MIN VERTICAL CLEAR M (113) SCOUR 5 STABLE W/IN FOOTING OR PILE (40) NAVIGATION HORIZONTAL CLEARANCE 6.7 M SCOUR POA DATE N/A CHANNEL DESCRIPTION Built up dirt and riprap slopes. MECHANICAL/ELECTRICAL ELEMENT INSPECTION RATINGS AND NOTES Elem Defect/ Element Description Env Total Units Qty in each Condition State No. Prot Defect Qty CS 1 CS 2 CS 3 CS 4 600 Support System - Structural 2 1 ea. 1 0 0 0 (600) Support System - Structural Non -Routine Inspection Element Notes: The structural support system consists of the end jacks and live load shoes, centering locks at each end of the bridge, and center wedges at the pivot pier. 601 Support System - Mechanical 2 1 ea. 0 1 0 0 9000 Operation 2 1 ea. 0 1 0 0 (601) Support System - Mechanical Non -Routine Inspection Element Notes: The mechanical support system consists of four systems. The center pivot rim roller bearings, end jacks, and end jack blocks. The rim roller bearings consist of six tapered rollers on the north, and six on the west of the center pier. There are two end jack blocks with live load shoes at each end of the swing span to support the bridge for traffic. Each set of blocks is driven by a single self-contained hydraulic motor and ram. There are two end jacks on each end of the swing span. They are electric motor driven screw jacks that lift the ends of the span so the end wedges can be pulled prior to operation of the bridge. (601-9000) Operation Non -Routine Inspection Element Notes: (06/02/2021) The north west end jack block drive is wobbling when the block is pulled and driven. **Update (5/9/23) Condition still present **Update (5/2/25) Condition still present 602 Balance System - Structural 2 1 ea. 1 0 0 0 (602) Balance System - Structural Non -Routine Inspection Element Notes: The balance system consists of pivot pier the balance rollers and ring girder assemblies. The steel grid deck is filled with concrete on the short span side of the pivot pier to help counterbalance the longer span. 603 Balance System - Mechanical 2 1 ea. 1 0 0 0 (603) Balance System - Mechanical Non -Routine Inspection Element Notes: Balance system consists of 12 rollers and ring girder on the pivot pier. 604 Drive System - Mechanical 2 1 ea. 1 0 0 0 (604) Drive System - Mechanical Non -Routine Inspection Element Notes: The bridge drive system consists of three parts: The hydraulic drive system located at the center pier that swings the bridge, the end jack block drive systems, and the end jack systems. Hydraulic Drive System The hydraulic drive system consists of a 5 HP hydraulic pump and reservoir which powers four brake units that brake against the rim bearing. The drive also powers four turning (slewing) cylinder rams that rotate the span. Flow control solenoid valves control the direction of the various rams. Each set of End Jack Blocks is driven by a single self-contained hydraulic motor and ram. The west end jacks located at the ends of the swing span, are each driven by a 5 HP electric motor, the east by a 10 HP motor. The motor drives a screw jack that pushes Printed on: Monday 06/23/2025 03:37 PM Page 6 of 9 29C0114/AAAZ/153158