page_title: Tidal bore
section_title: United States
hierarchical_section_title: Tidal bore / Rivers and bays with tidal bores / North America / United States
caption_attribution_description: English: Tidal bore at Moncton, New Brunswick.
context_page_description: A tidal bore, often simply given as bore in context, is a tidal phenomenon in which the leading edge of the incoming tide forms a wave of water that travels up a river or narrow bay against the direction of the river or bay's current.
context_section_description: The Turnagain Arm of Cook Inlet, Alaska. Up to 2 meters (7 ft) and 20 km/h (12 mph).
  Historically the Colorado River had a tidal bore up to 6 feet, that extended 47 miles up river.
  The Savannah River up to 10 miles (16 km) inland.
  Small tidal bores, only a few inches in height, have been observed advancing up tidal bayous on the Mississippi Gulf Coast.
caption: Tidal bore on the Petitcodiac River
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