IRB BRIDGE MLC RATINGS WATER FLOW VELOCITY FEET/SEC (METERS/SEC) CROSSING 0.0 1-2 3-4 5-6 7-8 9-10 TYPE (0.3-0.6) (0.9-1.2) (1.5-1.8) (2.1-2.4) (2.7-3.0) NORMAL Track 105 105 105 100 100 55 Wheel 105 105 105 100 100 55 CAUTION Track 115 115 115 110 110 65 Wheel 115 115 115 110 110 65 RISK Track 140 140 140 140 125 80 Wheel 140 140 140 140 125 80 TWO-LANE Track 20 20 20 20 20 0 Wheel 20 20 20 20 20 0 TM 5-5420-278-10 0036 00 0036 00-2 BRIDGE OPERATION (Contd) Table 2.  Improved Ribbon Bridge Length Restrictions. c.   Required Conditions for Bridges b.  Bridge Length Restrictions NOTE For moving bodies of water in minimum water depth of 2.6 ft (0.8 m), the bridge length is restricted as follows: Table 3.  Improved Ribbon Bridge Operation MLC Ratings. INTERIOR BAYS BRIDGE LENGTH WATER SPEEDS Up to 6 175.8 ft (53.60 m) max. 5 feet/sec (1.5 meters/sec) Up to 8 219.8 ft (67.01 m) max. 4.3 feet/sec (1.3 meters/sec) Up to 10 263.8 ft (80.42 m) max. 3.6 feet/sec (1.1 meters/sec)