Important Legacy real-time page

Available data

Select data types to graph from categories based on the way the data were collected.

Learn about the data collection categories

Continuous data

2 data types available - data from 2001-10-01 to 2026-08-17

Daily data

1 data types available - data from 1909-07-13 to 2026-08-15

Field measurements

2 data types available - data from 1917-01-15 to 2026-06-11

Discrete sample data

43 Observed properties (data types) available - with data from 1952-10-24 to 1999-06-25

124 Sampling activities

Peak measurements

2 data types available - with data from 1910-03-01 to 2025-05-11

Statistical tables for select daily data types

1 data types available - data from 1909-07-13 to 2026-08-15

Important information about this monitoring location

The elevation of this station has been determined to be 159.88 feet above NAVD 1988. To obtain stream water-surface elevation values in NAVD 1988 add 159.88 feet to gage height values.

Location details and information

Zoom out to see link to My Favorites

Use Explore USGS Water Data to discover additional data near this location

Operated in cooperation with:

US Army Corps of Engineers - New England District

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01094000	n/a
Location name	SOUHEGAN RIVER AT MERRIMACK, NH	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	42.8575865056128	n/a
Decimal longitude (WGS84)	-71.5061785066577	n/a
Latitude-longitude method	Interpolated from map	M
Latitude-longitude accuracy	Accurate to + or - 1 sec.	S
District	New Hampshire	33
State	New Hampshire	33
County	Hillsborough County	011
Country	United States of America	n/a
Altitude of gage/land surface	159.88 feet	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.01 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Winnipesaukee River	01070002
Drainage basin		n/a
Date of first construction		n/a
Drainage area	171 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	EST	n/a
Site honors Daylight Saving Time	Y	n/a
National aquifer		n/a
Local aquifer		n/a
Local aquifer type		n/a
Well depth		n/a
Hole depth		n/a
Source of depth data		n/a

Monitoring location Souhegan River at Merrimack, NH - USGS-01094000