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Controls the water level change so that boats can navigate up and down different water levels.

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16y ago

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What river flows into Mississippi's river?

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What is the longest lock on the river thames?

The longest lock on the River Thames is Teddington Lock. Teddington Lock also contains the smallest lock on the Thames, which is located in England.


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One long blast on the boat's horn or whistle indicates to the river lock attendant that you wish to go through the lock.


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Tides as far up river as Teddington Lock and heavy rainfall in the rest of the river.


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To alert a river lock attendant that you wish to go through the lock, you usually sound your horn or whistle in a specific sequence as defined by the lock operation rules. Typically, this involves a series of long and short blasts to communicate your intention to pass through the lock.


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A flashing amber light at a river lock typically indicates that the lock is in operation or that it is safe for vessels to proceed with caution. It serves as a warning to boaters to be alert and prepared for potential changes in the lock's status. Boaters should always follow any additional signage or signals provided at the lock to ensure safe passage.