Atlantic Coast at Hyannisport (IN MLLW)
Massachusetts — Water Level & Flood Stage
Located in Barnstable County, Massachusetts on the Atlantic Coast. Live water level data from USGS, updated every 15 minutes.
Current Water Level
Gage Height
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Streamflow
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Last Reading
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This is an NWS forecast point (LID: HYPM3). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
8.5 ft
Moderate Flood
6.5 ft
Minor Flood
5 ft
Action Stage
4 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
8 ft
Alternate travel routes are needed. Flooding 3 feet deep or higher affects coastal roads from Falmouth to Hyannisport where debris may wash onto roads when rough seas occur. In Hyannis Harbor, smaller docks are submerged and portions of Ocean Street will have flooding up to 3 feet deep. In Yarmouth, flooding affects neighborhoods near the harbor including Shore Road and Berry Avenue, which are flooded with up to 3 feet of water.
6.5 ft
Many roads become impassable around high tide. Flooding 2 to 3 feet deep affects coastal roads from Falmouth to Hyannisport where debris may wash onto roads when rough seas occur. In Hyannis Harbor, smaller docks are submerged and portions of Ocean Street will have flooding 1 to 2 feet deep. In Yarmouth, flooding affects neighborhoods near the harbor including Shore Road and Berry Avenue, which are flooded with 1 to 3 feet of water.
5.5 ft
Some roads may become impassable around high tide. Flooding 1 to 2 feet deep affects coastal roads from Falmouth to Hyannisport, where some debris may wash onto roads when rough seas occur. In Hyannis Harbor, smaller docks may be submerged and flooding up to 1 foot deep affects parts of Ocean Street.
5 ft
Some vulnerable coastal roads may briefly become impassable around high tide. Shallow flooding less than one foot deep affects low lying coastal roads from Falmouth to Hyannisport, as well as docks in Hyannis Harbor. Some debris may wash onto coastal roads when rough seas occur.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Dec 17, 2023 | 8.3 ft | — |
| Dec 17, 2023 | 8.3 ft | — |
| Dec 23, 2022 | 7.7 ft | — |
| Dec 23, 2022 | 7.7 ft | — |
| Jan 12, 2024 | 6.75 ft | — |
About This Gauge
NWS LID
HYPM3
River
Atlantic Coast
County
Barnstable, MA
Coordinates
41.6498°N, 70.2774°W
Get Flood Alerts for Atlantic Coast
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Atlantic Coast at Hyannisport (IN MLLW)?
The Atlantic Coast at Hyannisport (IN MLLW) gauge is maintained by USGS and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Atlantic Coast at Hyannisport (IN MLLW)?
The NWS-defined flood stage for Atlantic Coast at Hyannisport (IN MLLW) is 5 feet. Action stage begins at 4 feet. Moderate flooding starts at 6.5 feet, and major flooding at 8.5 feet.
How do I get alerts when Atlantic Coast rises?
Download StormCast free on Google Play, go to River Gauges, and add Atlantic Coast at Hyannisport (IN MLLW) to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category — even when your screen is off.
Where is the Atlantic Coast at Hyannisport (IN MLLW) gauge located?
The gauge is located in Barnstable County, Massachusetts at coordinates 41.6498°N, 70.2774°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: Hohonu
- Stage may be affected by ice.
- <span style="color: #ff0000;">Please refer to our <span style="background-color: #ffff00;"><a style="color: #ff0000; background-color: #ffff00;" title="Link to CFWBOX" href="https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=CFW&format=CI&version=1&glossary=0">Coastal Hazard Message</a></span> for specific information regarding Coastal Flood Watches, Warnings and Advisories. Actual impacts from any coastal flooding event may vary due to factors such as rainfall, wave action, and the number of tide cycles during which there is an onshore flow. During tropical cyclones, please refer <span style="background-color: #ffff00;"><a style="background-color: #ffff00;" title="Link to TCVBOX" href="https://forecast.weather.gov/product.php?site=NWS&issuedby=BOX&product=TCV&format=CI&version=1&glossary=1">here</a></span> for additional storm surge information.</span>
- <span style="color: #ff0000;">During a Tropical Storm or Hurricane Watch or Warning, inundation mapping provided by the <span style="background-color: #ffff00;"><a style="color: #ff0000; background-color: #ffff00;" href="https://www.nhc.noaa.gov">National Hurricane Center</a></span> (go to the web site and select the storm of interest) is available and reflects the reasonable worst case scenario.</span>