New Jersey Atlantic Coast at Sandy Hook (IN MLLW)
New Jersey — Water Level & Flood Stage
Located in Monmouth County, New Jersey on the New Jersey 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: SDHN4). Live data may be limited. View on NWS AHPS →
Flood Stages
Major Flood
8.7 ft
Moderate Flood
7.7 ft
Minor Flood
6.7 ft
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
What Floods at Each Level
14.4 ft
(Mean Lower Low Water (MLLW)) The level reached on October 29, 2012 during Post Tropical Cyclone Sandy. This is an estimated value. The tide gauge failed at 13.23 feet MLLW about an hour before the actual high water level occurred. A USGS high water mark about 1,500 feet away from the gauge was used to reconstruct the crest.
10.08 ft
(MLLW) The level reached during Hurricane Donna on September 12, 1960 and during the northeaster on December 11, 1992.
9.76 ft
(MLLW) The level reached during Hurricane Irene on August 28, 2011.
9.69 ft
(MLLW) The level reached on November 7, 1953.
9.39 ft
(MLLW) The level reached during the hurricane of September 14, 1944 and on March 6, 1962.
9.03 ft
(MLLW) The level reached on March 13, 2010.
8.99 ft
(MLLW) The level reached on November 25, 1950.
8.89 ft
(MLLW) The level reached on January 23, 1966.
8.88 ft
(MLLW) The level reached on December 23, 2022.
8.81 ft
(MLLW) The level reached on November 12, 1968.
8.76 ft
(MLLW) The level reached on October 27, 2018.
8.7 ft
(MLLW) MAJOR FLOODING. At this level, flooding starts to become severe enough to begin causing structural damage along with widespread flooding of roadways in Middletown Township, Atlantic Highlands, Highlands, Rumson and Sea Bright. Vulnerable homes and businesses may be severely damaged or destroyed as water levels rise further above this threshold. Numerous roads become impassable and some neighborhoods may be isolated.
7.7 ft
(MLLW) MODERATE FLOODING. At this level, widespread flooding of roadways begins due to high water and/or wave action with many roads becoming impassable in Middletown Township, Atlantic Highlands, Highlands, Rumson and Sea Bright. Lives may be at risk when people put themselves in harm's way. Some damage to vulnerable structures may begin to occur. COASTAL FLOOD WARNING LEVEL.
7.5 ft
(MLLW) Flooding begins along sections of NJ Route 36 in Middletown Township as water backs up into tidal streams in the community. Flooding begins along the access road to the Gateway National Recreation Area's Sandy Hook Unit. Flooding reaches the intersection of Ocean Avenue (NJ Route 36) and River Street in Sea Bright as well as the 300 and 1400 blocks of Ocean Avenue (NJ Route 36).
7 ft
(MLLW) COASTAL FLOOD ADVISORY LEVEL.
6.9 ft
(MLLW) Flooding begins in Middletown Township, Highlands and Rumson.
6.7 ft
(MLLW) MINOR FLOODING. Flooding begins in Sea Bright.
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 |
|---|---|---|
| Oct 28, 2012 | 14.4 ft | — |
| Oct 28, 2012 | 14.4 ft | — |
| Sep 11, 1960 | 10.08 ft | -9,999 cfs |
| Dec 10, 1992 | 10.08 ft | -9,999 cfs |
| Dec 10, 1992 | 10.08 ft | -9,999 cfs |
About This Gauge
NWS LID
SDHN4
River
New Jersey Atlantic Coast
County
Monmouth, NJ
Coordinates
40.4667°N, 74.0100°W
Get Flood Alerts for New Jersey 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 New Jersey Atlantic Coast at Sandy Hook (IN MLLW)?
The New Jersey Atlantic Coast at Sandy Hook (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 New Jersey Atlantic Coast at Sandy Hook (IN MLLW)?
The NWS-defined flood stage for New Jersey Atlantic Coast at Sandy Hook (IN MLLW) is 6.7 feet. Action stage begins at N/A feet. Moderate flooding starts at 7.7 feet, and major flooding at 8.7 feet.
How do I get alerts when New Jersey Atlantic Coast rises?
Download StormCast free on Google Play, go to River Gauges, and add New Jersey Atlantic Coast at Sandy Hook (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 New Jersey Atlantic Coast at Sandy Hook (IN MLLW) gauge located?
The gauge is located in Monmouth County, New Jersey at coordinates 40.4667°N, 74.0100°W. Data is provided by the U.S. Geological Survey and the National Weather Service.
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Source & Notes
Data provided by: NOAA National Ocean Service
- <head> <meta charset="utf-8"> <style type="text/css"> .style1 {background-color: #FFFF00;} </style> </head> Please refer to our <a href="http://forecast.weather.gov/product.php?site=NWS&issuedby=PHI&product=CFW&format=CI&version=1&glossary=0"> <span class="style1">Coastal Hazard Message</span></a> for specific information regarding Coastal Flood Watches, Warnings and Advisories. Flood impacts are based on long-term averages. Actual impacts from any tidal 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 class="style1"> <a href="https://forecast.weather.gov/product.php?site=NWS&issuedby=PHI&product=TCV&format=CI&version=1&glossary=1">here</a></span> for additional storm surge information.
- <style type="text/css">.style1 { background-color: #FFFF00;}</style> During a Tropical Storm or Hurricane Watch or Warning, inundation mapping provided by the <a href="http://www.nhc.noaa.gov/"><span class="style1">National Hurricane Center</span> </a>reflects a reasonable worst case scenario. The experimental forecast above is the total water forecast that is expected to occur.