Upper Ammonoosuc River near Groveton
Flood levels
Official flood levels at this gauge: action stage begins at 6.5 ft; minor flooding begins at 7.5 ft; moderate flooding begins at 9.0 ft; major flooding begins at 10.0 ft.
| Action stage | 6.5 ft |
|---|---|
| Minor flooding | 7.5 ft |
| Moderate flooding | 9.0 ft |
| Major flooding | 10.0 ft |
Highest recorded crests
- 12.0 ft on May 20, 1969 (historic crest)
- 9.4 ft on Mar 27, 1953 (historic crest)
- 9.0 ft on Apr 23, 1954 (historic crest)
- 9.0 ft on Mar 31, 1998 (historic crest)
What the water does
National Weather Service impact statements for this gauge, in the Weather Service's own words.
| 6.0 ft | River at bankfull. |
|---|---|
| 7.5 ft | Minor floooding occurs. Mechanics Street inundated along industrial areas in Groveton. Water encroaching on properties on Brooklyn Street and Mountain View Avenue. |
| 8.0 ft | Water up to Cumberland Street or Northside Road in Northumberland. Northside Road in Stark flooded. |
| 8.5 ft | In Stark, water is up to properties on Corkum Road and Northside Roads. |
| 9.0 ft | Moderate flooding occurs. Non-residential properties off West Street inundated. Water up to Winter Street and Route 110 in Groveton. |
| 9.5 ft | Cumberland Road and Northside Road flooded in numerous places in Groveton. |
| 10.0 ft | Major flooding occurs. Homes on Brooklyn Street flooded in Groveton. Water up to homes off West Street. |
Forecast office: NWS Gray · River Forecast Center: Northeast River Forecast Center.
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