To see the entire map from 1935 in high resolution, CLICK ON THIS LINK. This was before the Lake Pontchartrain Causeway and its approaches. It's always interesting to see where the roads were and what used to be located where. In Covington, La. Hwy. 21 jumped two blocks west of Tyler Street to cross the Tchefuncte River further upstream than it does now, and La. 22 west out of Madisonville has been re-aligned over the years.