The crest of the dam at Lake Hopatcong is 9.0 feet. NJSP high-water level is 9.5 feet when boat speeds are greatly restricted and no wakes are allowed. Rain gage data are available from this link.

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

1 data types available - data from 2007-10-01 to 2026-08-07

Daily data

1 data types available - data from 2013-10-01 to 2026-08-06

Field measurements

1 data types available - data from 1984-04-18 to 2026-05-29

Discrete sample data

0 observed properties (data types) available

Peak measurements

1 data types available - with data from 1887-08-04 to 2025-05-31

Statistical tables for select daily data types

0 data types available

Location details and information

Available location images

Lake Hopatcong at Landing

Lake Hopatcong at Landing

View more imagery information for Lake Hopatcong at Landing

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 Jersey Department of Environmental Protection

USGS - Cooperative Matching Funds

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	01455400	n/a
Location name	Lake Hopatcong at Landing NJ	n/a
Site type	Lake, Reservoir, Impoundment	LK
Decimal latitude (WGS84)	40.9175	n/a
Decimal longitude (WGS84)	-74.6641666666667	n/a
Latitude-longitude method	Interpolated from map	M
Latitude-longitude accuracy	Accurate to + or - 1 sec.	S
District	New Jersey	34
State	New Jersey	34
County	Morris County	027
Country	United States of America	n/a
Altitude of gage/land surface	914.5 feet	n/a
Method altitude determined	GNSS2 - Level 2 Quality Survey Grade Global Navigation Satellite System	X
Altitude accuracy	0.05 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Middle Delaware-Musconetcong	02040105
Drainage basin		n/a
Date of first construction		n/a
Drainage area	25.3 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 Lake Hopatcong at Landing NJ - USGS-01455400