In St. Bernard Parish, Magnolia Lagoon is listed as a lake, so on an opening trip I would fish one reachable area before widening the search. I would begin around one sheltered shoreline stretch instead of trying to cover the whole water, because one productive area is more useful than several random moves.
Magnolia Lagoon Size, Maximum Depth and Volume
A dependable standalone acreage, maximum depth, and storage figure is not published for Magnolia Lagoon, which is why I would judge the scale in person before making a long run, so I would treat the first outing as a chance to learn the water's scale. I would spend more time getting a feel for the place on the first visit, and that is more useful than pretending a nearby lake has the same dimensions.
Fishing This Water
The fishery at Magnolia Lagoon is lightly documented, and I would rather let the first catches narrow the plan, and I would rather avoid copying a species list from a nearby lake. I would keep things simple with a small tackle bag with a small jig, a worm, and a float, because the first bites can tell you more than a guessed species list.
A Practical Magnolia Lagoon Game Plan
My first plan for Magnolia Lagoon would be to fish one manageable starting zone deliberately and make changes only when the results justify them; if a bait begins producing, I would stay with it long enough to understand what is different about that spot.
Nearby fishing waters
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Distances are straight-line estimates between mapped water locations.