Western Flows

Madison River Below Hebgen Lake

Near Grayling Mt USGS: 06038500 Provisional Data Last Updated: May 24, 09:56 PM PT

Current Flow

455.0 cfs
Steady

Water Temp

47.8 °F
Safe (< 65°F)

Expected Weather

Temp --°F
Wind -- mph
Rain Chance --%
Pressure -- hPa

Location

System Insights

  • Water temperature is 48°F — below 50°F, the threshold associated with cold shock risk for immersion.

Verify access, permits, and local conditions before entering any waterway.

Today's Weather

Forecast Details

Morning

At 6 AM: 25°F and Clear, wind E at 6 mph. By 10 AM: 48°F and Clear, wind SW at 4 mph.

Afternoon/Evening

At 2 PM: 58°F and Mainly Clear, wind SW at 7 mph. By 6 PM: 58°F and Overcast, wind W at 7 mph.

Overnight

Dropping from 50°F at 10 PM to 42°F by 4 AM. Conditions Overcast with wind NE at 5 mph.

3-Day Outlook

🌓 First Quarter

Today, May 22

☁️

59° / 25°

Chance of Rain: 3%
5:49 AM 8:54 PM

Saturday, May 23

☁️

68° / 41°

Chance of Rain: 6%
5:48 AM 8:55 PM

Sunday, May 24

☁️

70° / 48°

Chance of Rain: 10%
5:47 AM 8:56 PM

7-Day Flow History

Source: USGS

The current cfs of 455 CFS is running below the historical median of 780 CFS for this date, indicating lower-than-average seasonal water levels.

Current (CFS)
Historical Median

7-Day Water Temperature (°F)

Source: USGS
Current (°F)
Historical Median
68°F Threshold

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Glossary & Methodology

Cubic Feet per Second (CFS)

The standard measure for streamflow. One CFS is equal to one cubic foot of water flowing past a specific point in one second (about 7.48 gallons).

Acre-Foot (AF)

The volume of water needed to cover one acre of land to a depth of one foot. One acre-foot is exactly 325,851 gallons.

Snow Water Equivalent (SWE)

The amount of water contained within the snowpack. It can be thought of as the depth of water that would theoretically result if you melted the entire snowpack instantaneously.

Data Sources

Live metrics and historical medians are aggregated directly from the US Geological Survey (USGS), California Data Exchange Center (CDEC), and National Resources Conservation Service (NRCS). Daily flow statistics represent provisional records and are subject to agency revision.