Sea Level and Coastal Flooding 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.

  • High Tide Flooding Outlooks

    Show when, where, and how often locations may experience high tide flooding caused by higher than normal high tides.
  • Sea Level Trends

    A map of sea level rise and fall, trends, and anomalies
  • Coastal Inundation Dashboard

    A decision support tool that helps communities anticipate and monitor what sea levels will do along the coast in the short-term and plan for the impacts of a high water event.
  • Post-Event Peak Water Levels

    Peak water level observations from NOS stations during tropical storms, hurricanes and significant non-tropical coastal storms.
  • 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.