<a href="https://www.usgs.gov/centers/alaska-science-center/science/usgs-alaska-streamgage-datum-north-american-vertical-datum">USGS Alaska Streamgage Datum to North American Vertical Datum of 1988 Conversion Table</a>

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Available data

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Continuous data

3 data types available - data from 1991-10-11 to 2026-08-04

Daily data

2 data types available - data from 1972-10-01 to 2026-08-04

Field measurements

3 data types available - data from 1972-09-17 to 2026-07-13

Discrete sample data

97 Observed properties (data types) available - with data from 1973-04-06 to 2020-07-15

122 Sampling activities

Statistical tables for select daily data types

2 data types available - data from 1972-10-01 to 2026-08-04

Important information about this monitoring location

The elevation of this station has been determined to be 1852.1 feet above NAVD 1988. To obtain stream water-surface elevation values in NAVD 1988 add 1852.1 feet to gage height values.

Location details and information

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USGS - Federal Priority Streamgages

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	15200280	n/a
Location name	GULKANA R AT SOURDOUGH AK	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	62.520833	n/a
Decimal longitude (WGS84)	-145.530833	n/a
Latitude-longitude method	Interpolated from map	M
Latitude-longitude accuracy	Accurate to + or - 10 sec.	T
District	Alaska	02
State	Alaska	02
County	Copper River Census Area	066
Country	United States of America	n/a
Altitude of gage/land surface	1852.1 feet	n/a
Method altitude determined	GNSS2 - Level 2 Quality Survey Grade Global Navigation Satellite System	X
Altitude accuracy	0.1 feet	n/a
Altitude datum	North American Vertical Datum of 1988	NAVD88
Subbasin hydrologic unit	Middle Copper River	19020102
Drainage basin		n/a
Date of first construction		n/a
Drainage area	1760 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	AKST	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 Gulkana R at Sourdough AK - USGS-15200280