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 2016-10-01 to 2026-07-31

Daily data

0 data types available

Field measurements

2 data types available - data from 2015-11-24 to 2026-07-10

Discrete sample data

0 observed properties (data types) available

Statistical tables for select daily data types

0 data types available

Important information about this monitoring location

The elevation of this site is 184.29 feet above NAVD 1988. To convert gage height to stream water level elevation above NAVD 1988, add 184.29 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:

USGS - Federal Priority Streamgages

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	09429495	n/a
Location name	IMPERIAL RESERVOIR AT IMPERIAL DAM, AZ-CA	n/a
Site type	Lake, Reservoir, Impoundment	LK
Decimal latitude (WGS84)	32.8828888888889	n/a
Decimal longitude (WGS84)	-114.462805555556	n/a
Latitude-longitude method	Interpolated from digital map	N
Latitude-longitude accuracy	Accurate to + or - .1 sec (Differentially-Corrected GPS).	1
District	Arizona	04
State	Arizona	04
County	Yuma County	027
Country	United States of America	n/a
Altitude of gage/land surface	184.29 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	Imperial Reservoir	15030104
Drainage basin		n/a
Date of first construction	19900829	n/a
Drainage area	188500 square miles	n/a
Contributing drainage area	184500 square miles	n/a
Time zone abbreviation	MST	n/a
Site honors Daylight Saving Time	N	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 Imperial Reservoir at Imperial Dam, Az-ca - USGS-09429495