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 TM 5-1940-277-10
TM 1940-10/1
NOTES
1. These ratings apply for a bridge held in place with bridge erection boats. In currents up to 6 ft/sec, one boat is
required per six bays. In 8 ft/sec, one boat is required every three bays. In 9 ft/sec,, one boat is required every
two bays. In currents above 9 ft/sec, or if the bridge is to remain in place for long periods of time, bridle lines
should be used (150vertical angle).
2. Vehicle spacing criteria:
Rating
Normal 100 feet (Front-To-Back)
Caution 150 feet (Front-To-Back)
Risk One vehicle only on bridge
3. Maximum Speeds for Normal Crossings:
On Ramps Class 0 to Class 40 -15 mph
Over Class 40 5 mph
On Bridge Class 0 to Class 40 25 mph
Over Class 40 15 mph
2-87
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