Western Flows

Tongue River At State Line

Near Decker, MT Stream Gauge USGS: 06306300 Provisional Data Last Updated: Aug 24, 04:26 AM PT

Current Flow

56.5 cfs
Steady

Water Temp

71.2 °F
Danger (68°F+)

Expected Weather

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

Location

Flow is within the typical range for this time of year (25th–75th percentile, based on 65 years of USGS record).

System Insights

  • Water temperature is 71°F — above the 68°F threshold.

  • Flow is running below average with no significant precipitation forecast over the next 3 days.

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

Today's Weather

Forecast Details

Morning

At 6 AM: 62°F and Clear, wind SE at 2 mph. By 10 AM: 76°F and Overcast, wind N at 11 mph.

Afternoon/Evening

At 2 PM: 86°F and Mainly Clear, wind N at 7 mph. By 6 PM: 87°F and Clear, wind N at 12 mph.

Overnight

Dropping from 71°F at 10 PM to 59°F by 4 AM. Conditions Overcast with wind W at 5 mph.

3-Day Outlook

🌔 Waxing Gibbous

Today, Aug 24

☁️

89° / 62°

Chance of Rain: 15%
6:20 AM 7:58 PM

Tuesday, Aug 25

☁️

86° / 58°

Chance of Rain: 4%
6:21 AM 7:57 PM

Wednesday, Aug 26

🌧️

92° / 63°

Chance of Rain: 12%
6:22 AM 7:55 PM

7-Day Flow History

Source: USGS

The current cfs of 56 CFS is running below the historical median of 144 CFS for this date, indicating lower-than-average seasonal water levels.

Current (CFS)
Historical Median
Normal Range (p25–p75)

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.