Gardner River near Mammoth, YNP water level

Name: Gardner River near Mammoth, YNP water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Gardner River, Montana, United States

Directions

Low for mid-October

Water level

1.81ft Steady over the last 24 hours

Measured Oct 20, 2026, 06:30 PM MDT (44 min ago)

Flow: 106 cfs

History

7 days

Water level

What this means

At 1.81 ft, the Gardner River near Mammoth, YNP is below normal for mid-October.

It has barely moved over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. Over the past 30 days it has moved between 1.81 ft and 1.84 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that.

Compared with 5 years of daily readings for this time of year. How to read levels

Key numbers

Highest on record: 5.09 ftJune 5, 2010

What the stage means on the water

Low water means more dragging on shallow riffles and slower floats. Fish crowd into the deeper runs, and warm, low water stresses them, so play and release them quickly.

What happens at each level

5.50 ft: Bankfull stage.
5.09 ft: Record stage and flow---2,110 cfs (6/5/2010).
1.81 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Rank	Level	Date
1	5.09 ft	June 5, 2010
2	5.03 ft	June 2, 1997
3	4.98 ft	May 16, 1996
4	4.83 ft	May 22, 1993
5	4.70 ft	June 1, 2003
6	4.65 ft	June 2, 1986
7	4.54 ft	June 6, 1995
8	4.54 ft	May 29, 1999
9	4.46 ft	May 20, 2009
10	4.42 ft	May 27, 2014

Weather at the gauge

No rain in the last 3 days.

19 Mon 67° 34° – Wind 10 mph

20 Tue 67° 42° – Wind 10 mph

21 Wed 64° 40° – Wind 11 mph

22 Thu 68° 43° – Wind 6 mph

23 Fri 50° 36° 1.26 in, 92% Wind 6 mph

24 Sat 42° 23° 0.02 in, 82% Wind 5 mph

25 Sun 48° 27° – Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:47 AM Sunset 06:29 PM Daylight 10 hr, 42 min Waxing gibbous 73%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Boiling River at Mammoth,YNPRiver gauge, Boiling River	20.5 cfs	Low	±0	0.5 mi
Yellowstone River at Corwin Springs MTRiver gauge, Yellowstone River	1.27 ft	Below flood stage	−0.02 ft	10 mi
Lamar River near Tower Ranger Station YNPRiver gauge, Lamar River	1.02 ft	Below flood stage	−0.01 ft	15 mi
Tantalus Creek at Norris Junction, YNPRiver gauge, Tantalus Creek	4.0 cfs	Normal	−0.1 cfs	18 mi
Gibbon River at Madison Jct, YNPRiver gauge, Gibbon River	70.0 cfs	Very low	±0	26 mi
Firehole River near West Yellowstone MTRiver gauge, Firehole River	198 cfs	Very low	−2.0 cfs	27 mi
Madison River near West YellowstoneRiver gauge, Madison River	303 cfs	Very low	±0	30 mi
Madison River below Hebgen Lake near Grayling MTRiver gauge, Madison River	707 cfs	Very low	±0	33 mi

Questions and answers

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Gardner River near Mammoth, YNP today?

On Oct 20, 2026, 06:30 PM MDT, the water level was 1.81 ft. Steady over the last 24 hours.

Is Gardner River near Mammoth, YNP rising or falling?

Steady over the last 24 hours.

Is the level of Gardner River near Mammoth, YNP normal?

Low for mid-October. Compared with 5 years of daily readings for this time of year.

What is the highest water level ever recorded at Gardner River near Mammoth, YNP?

The highest level on record is 5.09 ft on June 5, 2010.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:06191000 (Agency page)
Coordinates: 44.99234, -110.69097 (WGS84)
Vertical datum: NGVD29
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	1.81 ft	2026-10-21 00:30	Provisional
Flow	106 cfs	2026-10-21 00:30	Provisional

Download

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How to cite

U.S. Geological Survey: Gardner River near Mammoth, YNP (usgs:06191000). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/montana/gardner-river-near-mammoth-ynp

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer