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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: 6:15 PM EDT 10/10/25
Stage:4.73 ft
Flow:3.01 kcfs*
* Thousand cubic feet per second
Forecast
hydrograph
Flood Impacts
Historical Crests

Data provided by NOAA Advanced Hydrologic Prediction Service

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