Implemented in the map tool
High Tide Flooding Stations
NOAA Office for Coastal Management / NOAA CO-OPS · released Ongoing, part of the NOAA Sea Level Rise Viewer
Visit High Tide Flooding Stations
NOAA CO-OPS tide-gauge stations shown as points, each with today's minor, moderate, and major high-tide-flooding thresholds — about a dozen stations along the California coast.
General Information
- Geographic scope within coastal California
- Coastal United States, including California
- Tool release year and updates
- Ongoing, part of the NOAA Sea Level Rise Viewer
Projected Flood Information
- Annual flood risk
- No
- Annual flood risk (various return periods)
- No
- Base flood elevation
- No
- Coastal groundwater flooding
- No
- Erosion projections
- No
- FEMA flood zones
- No
- High tide flooding thresholds (minor/moderate/major)
- Yes
- King tide
- No
- Mapping uncertainty / confidence layers
- No
- Marsh migration space
- No
- Near-100-year storm scenario
- No
- Shoreline erosion
- No
- Storm surge / extreme tide
- No
- Stormwater / compound flooding
- No
- Wave run-up
- No
Shoreline Processes
- Coastal flood thresholds
- No
- Coastal groundwater
- No
- Compound flooding with stormwater runoff
- No
- Dynamic hydrodynamic modeling
- No
- Erosion / shoreline change
- No
- Habitat-based risk reduction
- No
- High tide flooding
- Yes
- Hurricane storm surge
- No
- King tide
- No
- Levee overtopping
- No
- Marsh migration
- No
- Marsh migration / habitat change
- No
- Regulatory base flood elevation
- No
- Riverine and coastal flood zones
- No
- SLR inundation
- No
- Shoreline erosion
- No
- Shoreline overtopping
- No
- Storm surge / extreme tide
- No
- Tide-gauge monitoring
- Yes
- Wave run-up
- No
Data, Reports, and Summary Information Available
- Reports, summary info, or other analyses available for download
- Per-station flood thresholds via NOAA's tide-gauge network; no downloadable report generator.
General Information Regarding Sea Level Rise Model
- Base sea level rise model
- None — today's tide-gauge-based thresholds, not tied to a future sea-level-rise scenario.
Strengths and Limitations
- Top 3 strengths
- Grounded in real, ongoing tide-gauge measurements rather than a modeled projection
- Distinguishes minor, moderate, and major flooding severity at each station
- Free, public, and continuously maintained by NOAA
- Top 3 limitations
- Sparse point data (~12 California stations), not a continuous flood-extent layer
- Doesn't shift with the sea-level-rise scenario slider — reflects today's thresholds only
- No exposure or infrastructure-impact analysis