Rio Atrato connects Atlantic/Pacific

In OTL the Atrato river comes within 30 miles of the Pacific Ocean,
but then turns north and empties into the Caribbean.

http://encarta.msn.com/map_701516021/atrato.html

What if it had a delta emptying into the Pacific near Antado, in
addition to the existing mouth ? This would let ships use it as
a natural Panama Canal, without the drastic climactic effects
of a sea-level connection.
 
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