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Souhegan River in New Hampshire

River33.5 mi

Around here

Around Souhegan River

Field & Stream RV Park7.1 miWapack National Wildlife Refuge6.9 mi5 mi

Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US

About this river

Souhegan River is a 33.5 mile river. Streamflow is measured at the USGS gauge Souhegan River at Merrimack, NH (site 01094000). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.

Typical flow by month

1909 to 2026

Souhegan River typically runs highest in April, at a median 634 cfs, and lowest in September, at 41 cfs. The highest flow on record for any single day is 14,200 cfs, in 1936.

Show the numbers
Typical flow by month at Souhegan River at Merrimack, NH, in cfs
MonthTypical (cfs)Usual range (cfs)
January203134 to 351
February200135 to 320
March420248 to 740
April634382 to 969
May282199 to 448
June13080 to 248
July6438 to 119
August4429 to 90
September4126 to 76
October5331 to 118
November13071 to 275
December208111 to 402

Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 92 years of record. Statistics published by the US Geological Survey for Souhegan River at Merrimack, NH (site 01094000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.

Boat access nearby

6 mapped launches sit in the mapped area of Souhegan River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.

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