Dark Swamp

From the introduction:

Kinipissa, Louisiana is a backwater township — from Shreveport a two-hour drive along the shadowy and muddy Bridgewater Highway (kept serviceable only by the Standard Oil company). Once crossing the Swamp’s Foot Bridge, the highway abruptly turns and cuts through Kinipissa’s cross-shaped township, housing a population of 290 survivors still living in the shadow of the Civil War.