This report talks about both Oak Ridge and Belle Isle..
http://www.wftv.com/news/news/local/attorney-missing-woman-michelle-parkers-cellphone-/nFxCP/
Parker's iPhone was discovered by a dive team under a bridge at Lake Conway in Belle Isle, detectives said. The site isnt far from the cell phone tower that registered the last ping from Parkers phone.
Authorities have centered nearly all search efforts around the cellphone, and the last place its signal hit cell towers was near Oakridge Road in Orlando.
Note: there is a tower at the end of Oakridge rd and Orange that could fit the tower in this report... 336 Fairlane and it only one block south of where Jesse Blacks Saloon is located
http://g.co/maps/a6mue
Okay, it now makes more sense to me--LE was simply looking in places around that area where they thought the phone was likely to be, and one of the possible places was Nela Bridge. That would logically fit with them not having received a tip--they just found it when they decided to search there.
That seems so likely that I wish I could just verify the cell phone question. Yet being Annoying Anal Person, I am waiting for an official confirmation.