How many lakes and reservoirs in New Hampshire are tracked here?

7, of which 3 report a current pool-elevation reading. The rest report storage only, or lack a fresh reading and are not published.

Which New Hampshire lakes report a %-full figure?

None of New Hampshire's lakes in this dataset currently have a source-provided %-full figure — we show the bare level rather than estimate one.

Where does the data come from?

USGS Water Services and USACE CWMS Data, both public domain. See the methodology page for the exact endpoints and update cadence.

New Hampshire lake & reservoir water levels

7 lakes tracked · 3 with a current elevation reading · USGS Water Services + USACE CWMS Data

New Hampshire has 7 lakes and reservoirs tracked here — 3 with a current elevation reading, from USGS Water Services and USACE CWMS Data. Sort the table by level, storage, %-full, or trend, then open any lake for its full elevation-with-datum, trend sparkline, storage, and source-and-vintage stamp. Figures are provisional readings for reference — not for navigation or safety decisions.

Statewide totals New Hampshire · USGS + USACE

Lakes tracked: 7
With elevation reading: 3
With %-full figure: 0

All New Hampshire lakes

Every lake tracked in New Hampshire. Click a column heading to sort, or filter by name. Elevation lakes are listed before storage-only lakes; a missing figure always shows "not reported," never an estimate.

Filter lakes

New Hampshire lakes, elevation lakes first, by name.
		Datum			Trend
Franklin Falls Dam	306.72	NGVD29	1	—	↓Falling
Otter Brook Dam	702.47	NGVD29	111	—	↑Rising
Surry Mountain Dam	491.38	NGVD29	0	—	↑Rising
Blackwater Dam	—	—	25	—	—
Edward Macdowell Dam	—	—	141	—	—
Everett Dam	—	—	997	—	—
Hopkinton Dam	—	—	61	—	—

Data: USGS Water Services (waterservices.usgs.gov) and USACE CWMS Data (cwms-data.usace.army.mil), retrieved 2026-07-14. Both public domain (a work of the U.S. Government, 17 U.S.C. §105).

Frequently asked questions

How many lakes and reservoirs in New Hampshire are tracked here?: 7, of which 3 report a current pool-elevation reading. The rest report storage only, or lack a fresh reading and are not published.
Which New Hampshire lakes report a %-full figure?: None of New Hampshire's lakes in this dataset currently have a source-provided %-full figure — we show the bare level rather than estimate one.
Where does the data come from?: USGS Water Services and USACE CWMS Data, both public domain. See the methodology page for the exact endpoints and update cadence.

Explore

Read the methodology behind these figures, or search all lakes nationally from the home page.