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 1991-10-01 to 2026-08-07

Daily data

1 data types available - data from 1940-08-10 to 2026-08-05

Field measurements

4 data types available - data from 1942-04-29 to 2026-07-02

Discrete sample data

36 Observed properties (data types) available - with data from 1954-10-09 to 1999-08-02

168 Sampling activities

Peak measurements

2 data types available - with data from 1936-03-01 to 2025-03-18

Statistical tables for select daily data types

1 data types available - data from 1940-08-10 to 2026-08-05

Important information about this monitoring location

The elevation of this station has been determined to be 916.43 feet above NAVD 1988. To obtain stream water-surface elevation values in NAVD 1988 add 916.43 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:

New Hampshire Department of Environmental Services

USGS - Cooperative Matching Funds

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01130000	n/a
Location name	UPPER AMMONOOSUC RIVER NEAR GROVETON, NH	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	44.6250531631805	n/a
Decimal longitude (WGS84)	-71.4689721491674	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	Coos County	007
Country	United States of America	n/a
Altitude of gage/land surface	916.43 feet	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.1 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Headwaters Connecticut River	01080101
Drainage basin		n/a
Date of first construction		n/a
Drainage area	232 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 Upper Ammonoosuc River Near Groveton, NH - USGS-01130000