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Sea Level Information

Flooded streets and parking lots, overflowing sewer systems, higher water during storms, disappearing coastlines. City planners in coastal states are all facing the same question: what decisions do we need to make today to protect our people, land, and infrastructure from extreme events and sea level change?

NOAA's Center for Operational Oceanographic Products and Services (CO-OPS) is the nation's source for coastal inundation data and sea level trends through its network of long-term water level gauges. With this data and online tools and analysis, CO-OPS enables coastal communities to better plan for and mitigate risk from changing ocean conditions.

For many coastal communities, the impacts of sea level change are here now, not years away. CO-OPS understands that coastal cities are already dealing with higher tides, more frequent tidal flooding, and more extreme water levels during storms. CO-OPS provides a suite of tools, including critical real-time information and outlooks that communities can use to prepare for these coastal hazards.

  • Sea Level Trends Online - A map of sea level rise and fall, trends, and anomalies
  • High Tide Bulletin - An interactive map to show each region of the U.S. when and why their region may experience higher than normal high tides.
  • Inundation Analysis Information - Analytic tool that shows how often and for how long certain areas of the coast experience high or low water. This information can be used for coastal restoration, coastal engineering and mapping projects.
  • Extreme Water Levels - Statistics that shows the likelihood water levels will exceed a given elevation for select NOAA stations.
A flooded street in Alexandria, Virginia during the perigean spring tide in May, 2016.
Coastal Flooding in Alexandria, Virginia during the perigean spring tide in May, 2016.


Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services