Boston Harbor at Boston (IN MLLW)
Stage at this gauge is reported IN MLLW.
Flood levels
Official flood levels at this gauge: action stage begins at 11.5 ft; minor flooding begins at 12.5 ft; moderate flooding begins at 14.0 ft; major flooding begins at 15.0 ft.
| Action stage | 11.5 ft |
|---|---|
| Minor flooding | 12.5 ft |
| Moderate flooding | 14.0 ft |
| Major flooding | 15.0 ft |
Highest recorded crests
- 15.2 ft on Jan 4, 2018 (historic crest)
- 15.1 ft on Feb 7, 1978 (historic crest)
- 14.7 ft on Mar 2, 2018 (historic crest)
- 14.4 ft on Jan 13, 2024 (historic crest)
What the water does
National Weather Service impact statements for this gauge, in the Weather Service's own words.
| 12.5 ft | Shallow pockets of flooding less than one foot deep affects the lowest lying areas, including Morrissey Boulevard in Boston. |
|---|---|
| 13.5 ft | Some vulnerable coastal roads become impassable around high tide. Flooding 1 to 2 feet deep affects some coastal roads and low lying areas from Revere and Winthrop through Boston to Hull, Braintree, and Quincy. Splashover and debris may wash onto coastal roads when large waves occur. |
| 14.0 ft | Many coastal roads become impassable. Flooding 1 to 3 feet deep affects coastal roads and some homes in low lying areas in Revere, Winthrop, Hull, Weymouth, Braintree, and Quincy. In Boston, flooding affects portions of the waterfront including Long Wharf and the Aquarium MBTA Station. Splashover and debris washes onto coastal roads when large waves occur. |
| 14.5 ft | This is a serious flood situation. Many coastal roads become impassable. Flooding 2 to 3 feet deep affects roads and homes in low lying areas in Revere, Winthrop, Hull, Weymouth, Braintree, and Quincy. In Boston, flooding affects the Seaport District including Long Wharf and the Aquarium MBTA Station. Splashover and debris washes onto coastal roads when large waves occur. |
| 15.0 ft | This is a degree of flooding rarely seen. Life threatening flooding more than 3 feet deep affects many coastal roads and homes in low lying areas in Revere, Winthrop, Hull, Weymouth, Braintree, and Quincy. In Boston, deep flooding affects the Seaport District including Atlantic Avenue, Long Wharf, and the Aquarium MBTA Station. Flooding will occur several hours before and after high tide. Follow the instructions of local officials and evacuate if asked to do so. Find alternate travel routes. |
| 16.0 ft | This is a degree of flooding that has never been experienced before. Life threatening flooding more than 3 feet deep affects homes and roads from Revere and Winthrop through Hull, Quincy, Braintree, and Weymouth. In Boston, deep flooding affects the Seaport District including Atlantic Avenue, Long Wharf, and the Aquarium MBTA Station. Flooding will occur several hours before and after high tide. Follow the instructions of local officials and evacuate if asked to do so. Find alternate travel routes. |
Forecast office: NWS Norton · River Forecast Center: Northeast River Forecast Center.
A NOAA tide station shares this spot: BOSTON, with tide predictions and official flood levels.
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Nearby stations and gauges
- BOSTON NOAA tide station · 0.0 mi
- Charlestown NOAA tide station · 1.3 mi
- Chelsea St. Bridge NOAA tide station · 2.7 mi
- Amelia Earhart Dam NOAA tide station · 3.1 mi
- Muddy River at Brookline NWS gauge · 3.3 mi
- Moon Head NOAA tide station · 4.3 mi