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Local Info
Critical Stages
16' - Action18' - Flood26' - Moderate Flood35' - Major Flood
Merrimack River - Gauge NSHN3
Nashua, NH
Lat: 42.70N, Lon: 71.44W
 
Latest Observation
 Updated: 8:15 AM EDT 10/8/25
Stage:4.52 ft
Flow:2.17 kcfs*
* Thousand cubic feet per second
Forecast
hydrograph
Flood Impacts
Historical Crests

Data provided by NOAA Advanced Hydrologic Prediction Service

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