Since I've been inundated with PMs on the subject I'll give up a little more info.
Where to start if you are fishing from the Northshore--if the water is clear the first place I would try is the drop-off under the Causeway by the extra bridges. Sometimes they are there early in the morning and sometimes late in the afternoon. If they aren't there then I would suggest hitting the 1st cross-over area (the more pilings the better) and then hit the bridges. The draw-bridge's wooden pilings is one of my all time favorite places when the water is clean and calm (unfortunately calm also tends to bring in the fog so becareful). Then all of the other cross-overs and bridges AND do not forget to hit all the 3 legged spans--the 2 legged spans can be productive but only a falling tide but they don't hold as many schools of fish as the others typically do.
If you coming from the Southshore--I would advise fishing the old turnaround on the original span first and then head towards the North fishing in the same areas.
There are a couple of people who have said they have fished the Causeway hard for years and never caught a hybrid or striper. The reason is due to 3 things: (1) wrong lure choice (if it ain't all white then you are wasting your time); (2) fishing only lasts from Nov to early March typically when water Temps are below 65; and (3) the number of days are fewer due to muddy water (esp. Southshore), winds from fronts, and fog.
I can't say I was the founder of this type of fishing because the expert on the Lake P striper fishing but if you were around Mandeville during the early 80's you might have visited a tackle shop called Toledo Tackle of Mandeville (where George's Mexican restaurant is today). The owner and his son were the two pioneers and really promoted the fishery until their deaths. After they passed away most of the local knowledge went away with them but the fish stayed year after year.
One person asked me how do you clean them--filet them the same way you would any other fish but it is very important that you cut out the entire blood line otherwise the fish will taste terrible when you cook it.
Below are my suggestions
H&H #41 in the Queen Cocahoe or
#14 in the Split tail version. Size 3 from H&H
Or use the all white curly tail below. Size 3 to 6 inches for the soft tails. The white pearl isn't as productive as the all white and the all white with a small red spot is even deadlier so long as the spot is close to the jig head.
PS--this has to be one of the best Striper fishing seasons in the Lake because i just came across a Louisiana Sportsman's article from Dec 2012 on the Stripers tearing it up at Seabrook. Striper fishing at Seabrook has always been inadvertent but if they are catching them there as this article suggests then the Causeway should be stacked this year. http://www.louisianasportsman.com/details.php?id=4650
and these guys are always putting out quality info .......
:*****:
On a side note--at one time most of the Top 10 Hybrid Striped Bass were caught in Lake Pontchartrain. Today William Hungerford still has the #1 (Causeway), #4 (Causeway), & #10 (Pass Manchac) La. State records for Hybrids. The 16.25 was caught in 2000. In the late 80's/early 90's the gill fisherman would bring in even bigger Hybrids and Stripers than that. The biggest Striper I've caught was #25 pounds in 1998 at the draw bridge.