Generally, in automation industry in real life it is a global need for ease of operation, flexibility and operational safety. This paper presents automation on controlling the movement of a bridge using a programmable logic controller. The idea is to automate the process of ship detection, opening or closing of a bridge, controlling the signals and road barriers. The purpose of the research is to replace the needs of today for low cost transportation. The Delta PLC is used to mechanize the system. Some Sensors such as IR Sensor, Ultrasonic Sensor are used to provide input to the system and servo motor serves as an actuator. Ladder diagram as a programming language is used to control the whole system between the input and for road traffic and water (ship) traffic. With the help of IR Sensor the arrival and leaving of the ship is monitored and bridge is operated accordingly and Ultrasonic sensor is used to detect the level of the water. In case of flood situation occurs, ultrasonic sensor indicates the high level of water.