River Street's cobblestone ramps once carried cotton bales and naval stores onto schooners bound for Liverpool and Charleston; today they serve as departure points for dolphin-watching vessels that navigate the same tidal channels British traders mapped in the 1730s. The Savannah River's brackish mix — fresh water descending from the Appalachian piedmont meeting Atlantic swells — creates a nutrient corridor that draws Atlantic bottlenose dolphins year-round, particularly where the river bends past Fort Jackson and widens into the sound. The same hydraulic forces that made Savannah a deepwater port sustain one of the southeast coast's densest inshore dolphin populations, with pods of six to twelve animals hunting mullet and spot along the spartina marsh edges that fringe Hutchinson Island and the approach to Tybee Roads. Savannah dolphin tours river street operations benefit from a geographic accident: the historic riverfront sits just eight nautical miles upstream from the dolphins' primary foraging grounds, a proximity that allows morning departures to reach open water within twenty minutes and return before the afternoon flood tide reverses current direction. Captains time their routes to coincide with the outgoing tide, when baitfish concentrate in the narrowing channels and dolphins work cooperatively to herd prey against mudflats and oyster bars. The strategy mirrors techniques Gullah fishermen employed here for two centuries, reading water color and bird activity to predict where marine mammals would surface. The vessels themselves range from twenty-two-foot open skiffs to sixty-passenger pontoon cats, all operating under NOAA guidelines that mandate a fifty-yard approach distance and prohibit feeding or harassment. Onboard naturalists — many affiliated with the Tybee Marine Science Center — provide real-time identification of individual dolphins by dorsal fin notches and scars, a photographic catalogue now spanning three decades and documenting matrilineal pod structures unique to this estuary. The same guides point out loggerhead turtles transiting between nesting beaches and offshore feeding zones, brown pelicans plunge-diving at tide rips, and the occasional manatee trailing warm-water discharge from the Elba Island power plant. Savannah's dolphin-watching infrastructure emerged in the early 1990s, when recreational anglers began adapting their charter schedules to meet demand from cruise-ship passengers docking at the Georgia Ports Authority terminal. What started as ad hoc trips from the public boat ramp evolved into a regulated industry with dedicated ticketing kiosks along River Street's Factor's Walk, the nineteenth-century iron bridgeways that connect the bluff-top commercial district to the waterfront below. The physical layering — street level, bridgeway, wharf — mirrors the experience itself: visitors descend through Savannah's mercantile past to board vessels that operate in a working river, where container ships, naval auxiliaries, and eco-tourism boats share the federally maintained shipping lane that remains the city's economic lifeblood.