RIVER GAUGE · NORTH BRANCH RARITAN RIVER
North Branch Raritan River at South Branch
Somerset County, New Jersey
Water level1.59 ft
Flow—
Last readingSep 16, 2026, 5:00 PM UTC (last recorded)
Action7 ft
Minor flood8 ft
Moderate flood9 ft
Major flood11 ft
The past week
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What floods at each level
- 11 ft
Flooding increases impacting roadways and structures along Milltown Road, North Branch River Road, and Old York Road toward Raritan.
- 9 ft
Flooding increases on Old York Road. The road remains closed.
- 8 ft
Flooding begins on Old York Road on the west side of the bridge. The road is closed.
- 7 ft
The river leaves it's banks and floods surrounding open land.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Sep 2, 2021 | 20.26 ft | — |
| Sep 15, 1999 | 18.98 ft | — |
| Feb 5, 1896 | 18 ft | — |
More on North Branch Raritan River
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