TornadoLiveMap

Reservoirs at Grassy Lake Reservoir — water level right now

Teton County, Wyoming · NWS gauge GRLW4
Loading the latest reading…
–
current stage (ft)
 
7212
minor flood stage
 
–
flood status
official NWS category
Official NOAA forecast → Full US flood map →

Flood stages at this gauge

Where the water stands right now against the four official thresholds:

action · 7210
minor · 7212
Flood stageLevel (ft)What it means
Minor flood stage7212low-lying roads and fields near the river start to flood
Action stage7210water is approaching flood level — time to pay attention

Highest floods on record here

The National Weather Service has no historic crest list on file for this gauge.

Where this gauge is

The marker is this gauge; nearby gauges load live and are clickable.

Nearby river gauges

Snake River at Flagg Ranch 8 mi away · loading… Snake River below Jackson Dam 22 mi away · loading… Firehole River at Old Faithful (YNP) 23 mi away · loading… Pacific Creek near Moran 24 mi away · loading… Buffalo Fork above Lava Creek near Moran 27 mi away · loading… Firehole River near West Yellowstone MT 34 mi away · loading…

Gauge details

NWS gauge IDGRLW4
CountyTeton
StateWyoming
NWS forecast officeRiverton
River forecast centerNorthwest River Forecast Center
Coordinates44.131, -110.816
Time zoneMST7MDT
Turn Around, Don't Drown. Six inches of moving water can knock you off your feet and twelve inches can float a car. Never drive around barricades or into water of unknown depth — most flood deaths happen in vehicles.

Questions about Reservoirs at Grassy Lake Reservoir

Is Reservoirs at Grassy Lake Reservoir flooding right now?

The live reading at the top of this page answers that: the gauge is compared against its official NWS flood stages every 15 minutes. Minor flooding at this gauge begins at 7212 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for Reservoirs at Grassy Lake Reservoir?

minor flood stage 7212 ft, action stage 7210 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

Where does this data come from?

From the NOAA National Water Prediction Service, the official U.S. river gauge network — a U.S. government work in the public domain. Live stage is refreshed every 15 minutes; flood thresholds and historic crests are refreshed monthly. For life-safety decisions follow NWS Riverton and local emergency management.