Important for you to know:

How are we doing? We want to hear from you. Take our quick survey to tell us what you think.
Scheduled Maintenance Notice
USGS will be performing maintenance on the time series data processing system beginning at 09:00 EDT on September 9, 2026. During this period, delivery of the latest time series data will be delayed. The maintenance is expected to finish within 2 hours, after which all backlogged time series data will be processed and delivered to WDFN web portals and APIs.

Available data

Select data types to graph from categories based on the way the data were collected.

0 data types available

1 data types available - data from 1940-10-01 to 1953-10-31

1 data types available - data from 1970-09-11 to 2005-08-11

5 Observed properties (data types) available - with data from 1985-08-12 to 1985-08-12

1 Sampling activities

2 data types available - with data from 1941-06-07 to 1975-06-20

1 data types available - data from 1940-10-01 to 1953-10-31

Zoom out to see link to My Favorites

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	12335000	n/a
Location name	Blackfoot River near Helmville MT	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	46.9387194444444	n/a
Decimal longitude (WGS84)	-112.940736111111	n/a
Latitude-longitude method	Interpolated from digital map	N
Latitude-longitude accuracy	Accurate to + or - .1 sec (Differentially-Corrected GPS).	1
District	Montana	30
State	Montana	30
County	Powell County	077
Country	United States of America	n/a
Altitude of gage/land surface	4301.29 feet	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.01 feet	n/a
Altitude datum	National Geodetic Vertical Datum of 1929	NGVD29
Subbasin hydrologic unit	Blackfoot	17010203
Drainage basin		n/a
Date of first construction		n/a
Drainage area	482 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	MST	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