A bollard assembly includes a post including at least one locking flange or pin and a cooperating base defining a post receiver. The base includes at least one interior wall including at least one cooperating locking groove dimensioned and configured to receive an end of the at least one locking flange or pin. The at least one cooperating locking groove includes at least one portion defining a substantially vertical pathway and at least one intersecting portion defining a substantially horizontal pathway. The at least one cooperating locking groove may defined by a top portion and a bottom portion each defining a substantially vertical pathway, and an intersecting intermediate portion defining a plane oriented substantially perpendicularly to the top portion and the bottom portion.