The Poitevent Favre Lumber Co. sawmill in Mandeville. It was located just east of where the Lake Pontchartrain Causeway north toll plaza is today.
In this 1976 article, Polly Morris explains what an efficient operating sawmill meant to a community in particular and what it meant for St. Tammany as a whole. Click on the image below to enlarge the text. There are two pages to the article.
The Greenlaw Lumber Company saw mill was in Ramsay, just north of Covington
The following photographs are from the Madison Lumber company operations
The Koepp Sawmill in 1919