Atlantic Coast at Seavey Island (IN MLLW)
Stage at this gauge is reported IN MLLW.
Flood levels
Official flood levels at this gauge: action stage begins at 10.0 ft; minor flooding begins at 11.5 ft; moderate flooding begins at 12.5 ft; major flooding begins at 13.5 ft.
| Action stage | 10.0 ft |
|---|---|
| Minor flooding | 11.5 ft |
| Moderate flooding | 12.5 ft |
| Major flooding | 13.5 ft |
Highest recorded crests
- 12.4 ft on Dec 23, 2022 (historic crest)
What the water does
National Weather Service impact statements for this gauge, in the Weather Service's own words.
| 11.0 ft | Minor flooding of low lying coastal locations in Kittery, Portsmouth, New Castle, and Newington. Vulnerable waterfront pier locations, low lying causeways, and roads could see up to 1 foot of inundation. |
|---|---|
| 11.5 ft | Flooding impacts Ceres and Mechanic Street in Portsmouth. |
| 12.0 ft | Moderate flooding of low lying coastal areas in Kittery, Portsmouth, New Castle, and Newington. Flooding expands in Portsmouth with numerous streets inundated along the waterfront. Some commercial and residential buildings in Portsmouth and Kittery impacted. |
| 12.5 ft | Flooding impacts roads in New Castle with water approaching the 1B causeway and Wentworth Road. |
| 13.0 ft | Near flood of record with major widespread coastal flooding expected. Numerous buildings inundated along Portsmouth waterfront and the North Mill Pond area. Residential roads in Kittery flooded, isolating neighborhoods. Route 1B on the causeway and Wentworth Road leading to New Castle are most imapcted. |
| 13.5 ft | Record flooding. Expect inundation of roads and buildings along the waterfront and back bays that has never occurred in previous events. Several vulnerable coastal roads inundated with several feet of water. Route 1 in Portsmouth inundated near Sagamore Creek. Route 1B inundated in multiple locations on all access points to New Castle. |
Forecast office: NWS Gray · River Forecast Center: Northeast River Forecast Center.
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Nearby stations and gauges
- Seavey Island NOAA tide station · 0.0 mi
- Portsmouth NOAA tide station · 0.5 mi
- Atlantic Heights NOAA tide station · 1.3 mi
- Fort Point NOAA tide station · 1.6 mi
- Kittery Point NOAA tide station · 1.9 mi
- Jaffrey Point NOAA tide station · 2.1 mi