A watercraft transport lock includes a walled structure that can be filled and emptied of water received from two separate bodies of water for the purpose of transporting a boat or other watercraft between the two bodies of water. The system prevents the water of one body from mixing with the water of the other body. This is accomplished by removing the water of the first body of water from within the structure prior to filling the structure with the water from the other body. A boat support may be used to support the boat during the emptying and filling processes.

 
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