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ABSTRACT
The bacteriological impact of clamshell dredging Mississippi River bottom sediment (river mile 820 [about 1,320 km]) was investigated. Total coliform (TC), fecal coliform (FC), and fecal streptococcus (FS) densities were determined for dredged sediment and for water samples collected from above and below the clamshell dredge and above and below discharge of dredged material. Each sample was also examined for the presence of salmonella and shigella. Results indicated that clamshell dredging had no significant effect (at the level α = 0.05) on microbiological water quality as measured by TC, FC, FS, and FC/FS determinations. Salmonellae were detected in 7.1% of the upstream samples and in 16.7% of the downstream samples.