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Snake River above Jackson Lake at Flagg Ranch water level

River gauge, Snake River, Wyoming, United States

Directions

Below flood stage

Water level

2.40ft Steady over the last 24 hours

Flow
259 cfs
Water temperature
45 °F
5 10 Highest onrecord 10.75 ft Minor floodstage 10.00 ft

History

2.42.52.62.7ftOct 16Oct 19Oct 22Oct 25Oct 282.42.52.62.7ftOct 16Oct 22Oct 28
Water level Forecast Minor flood stage

The forecast expects the river to rise to 2.69 ft by Saturday, October 24 at 06:00 AM. Issued Sunday, October 18 at 10:54 AM by NOAA National Weather Service.

What this means

The Snake River above Jackson Lake at Flagg Ranch is at 2.40 ft, in the normal range.

It is 7.60 ft below the flood stage of 10.00 ft.

The level has held steady over the past 24 hours. The forecast expects the river to rise to 2.69 ft by Saturday, October 24 at 06:00 AM. In the last month it has stayed between 2.40 ft and 2.44 ft.

The sensor also reports a water temperature of 45 °F.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record
10.75 ftJune 5, 1996
Forecast peak
2.69 ftSaturday, October 24 at 06:00 AM

Floating and fishing near Snake River above Jackson Lake at Flagg Ranch

Normal flows mean predictable rapids and good access at most put-ins.

Flood stage here is 10.00 ft, 7.60 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

11.00 ft
Lower sections of downstream parking lot may be under water. Flagg Ranch campgrounds still not affected.
10.75 ft
Record stage and flow---15,000 cfs (6/5/1996).
10.00 ft
Flood stage. Minor flooding along lower sections of parking lot 300 feet downstream of gage on right bank.
9.00 ft
Bankfull stage.
2.40 ft
Right now

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

Highest crests on record

Chance of at least minor flooding in October to December: < 5 %.

RankLevelDate
110.75 ftJune 5, 1996
210.16 ftJune 5, 1997
39.41 ftJune 6, 1986
49.30 ftJune 6, 1995
59.25 ftJune 24, 2011
69.13 ftMay 31, 2009
79.03 ftMay 28, 2014
88.74 ftJune 5, 2017
98.72 ftMay 22, 2006
108.71 ftMay 25, 1991

Weather at the gauge

The forecast is not available right now.

Sunrise 07:43 AM Sunset 06:34 PM Daylight 10 hr, 51 min First quarter 60%

Map

Other gauges on the Snake River

Gauge Level Compared with normal 24 hours Distance
Snake River near MoranRiver gauge, Snake River 285 cfs Normal ±0 17 mi
Snake River at MooseRiver gauge, Snake River 8.89 ft Below flood stage −0.01 ft 31 mi
Snake River below Flat Creek, near JacksonRiver gauge, Snake River 1.31 ft Below flood stage −0.04 ft 50 mi
Snake River above Reservoir, near AlpineRiver gauge, Snake River 1,830 cfs Normal −50.0 cfs 63 mi
Snake River near IrwinRiver gauge, Snake River 2,500 cfs Normal ±0 59 mi
Snake River near HeiseRiver gauge, Snake River 2.59 ft Below flood stage ±0 60 mi
Snake River at LorenzoRiver gauge, Snake River 1,350 cfs Normal −10.0 cfs 65 mi
Snake River near MenanRiver gauge, Snake River 1.86 ft Below flood stage −0.02 ft 70 mi
Snake River above Eagle Rock near Idaho FallsRiver gauge, Snake River 6.07 ft Below flood stage ±0 77 mi
Snake River near ShelleyRiver gauge, Snake River 5.57 ft Below flood stage −0.05 ft 87 mi
Snake River at BlackfootRiver gauge, Snake River 5.25 ft Below flood stage −0.09 ft 105 mi
Snake River near BlackfootRiver gauge, Snake River 2.94 ft Below flood stage −0.15 ft 114 mi

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Grassy Lake and Grassy LakeLake 7,179.78 ft Very low 8 mi
Jackson Lake and Jackson LakeLake 6,734.21 ft Very low 17 mi
Pacific Creek at MoranRiver gauge, Pacific Creek 4.29 ft Below flood stage −0.02 ft 19 mi
Buffalo Fork above Lava Creek, near MoranRiver gauge, Buffalo Fork 1.02 ft Below flood stage −0.02 ft 21 mi
Fall River above Yellowstone Canal near SquirrelRiver gauge, Fall River 431 cfs Very low −4.0 cfs 24 mi
Firehole River at Old Faithful, YNPRiver gauge, Firehole River 37.7 cfs Very low ±0 26 mi
Fall River near SquirrelRiver gauge, Fall River 212 cfs Very low +3.0 cfs 29 mi
Gros Ventre River at KellyRiver gauge, Gros Ventre River 4.16 ft Below flood stage −0.05 ft 33 mi

Questions and answers

What is flood stage for the Snake River above Jackson Lake at Flagg Ranch?

The official flood stage is 10.00 ft. The level is currently 7.60 ft below it.

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 Snake River above Jackson Lake at Flagg Ranch today?

On Oct 19, 2026, 09:30 AM MDT, the water level was 2.40 ft. Steady over the last 24 hours.

Is Snake River above Jackson Lake at Flagg Ranch rising or falling?

Steady over the last 24 hours.

Is the level of Snake River above Jackson Lake at Flagg Ranch normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Snake River above Jackson Lake at Flagg Ranch?

The highest level on record is 10.75 ft on June 5, 1996.

Is Snake River above Jackson Lake at Flagg Ranch expected to rise?

The forecast expects the river to rise to 2.69 ft by Saturday, October 24 at 06:00 AM.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Geological Survey
Station code
usgs:13010065 (Agency page)
Coordinates
44.09889, -110.66750 (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

ParameterLast valueTime (UTC)Quality
Water level 2.40 ft 2026-10-19 15:30 Provisional
Flow 259 cfs 2026-10-19 15:30 Provisional
Water temperature 45 °F 2026-10-19 15:30 Provisional

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How to cite

U.S. Geological Survey: Snake River above Jackson Lake at Flagg Ranch (usgs:13010065). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/wyoming/snake-river-above-jackson-lake-at-flagg-ranch

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