I use charts just for reference. Best thing to do is to check the real time data for the area you will be fishing. The day before i go fishing i look at the data and see when the high and low tides were. Then add about an hour for the next day. This way, by using the real time data you take into account the current wind conditions and how its affecting the tide movement.
Link to all Louisiana stations:
http://waterdata.usgs.gov/la/nwis/current/?type=flow
Scroll down to the Calcasieu River sections. They have a guage at the jetties, turners bay area, and at I-10. I like to set the output from graph to table. That way I can see the readings at each hour. Low tide today at the Jetties was at around 5am and low tide at Turners Bay was around 9am.
Hope this helps.