Western Flows

Trinity River Ab North Fork Trinity River

Near Helena USGS: 11526400 Provisional Data Last Updated: May 14, 06:10 PM PT

Current Flow

1,340 cfs
Steady

Water Temp

55.9 °F
Safe (< 65°F)

Expected Weather

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

Location

Basin: Sprague County: Trinity Elevation: 1,357 ft Drainage Area: 1,137.0 mi²
Flow is unusually low for this time of year (below the 10th percentile, based on 21 years of USGS record).

System Insights

  • Critically low. Well below the historical range for this date.

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

  • Flow has fallen from below the 25th percentile to below the 10th percentile over the past 7 days (1,640 → 1,340 cfs).

  • Real-time flow is running well above current model projections. On-the-ground conditions are outpacing the forecast.

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

Today's Weather

Forecast Details

Morning

At 6 AM: 47°F and Clear, wind NW at 2 mph. By 10 AM: 65°F and Clear, wind W at 9 mph.

Afternoon/Evening

At 2 PM: 76°F and Clear, wind W at 15 mph. By 6 PM: 70°F and Clear, wind W at 13 mph.

Overnight

Dropping from 56°F at 10 PM to 52°F by 4 AM. Conditions Clear with wind W at 11 mph.

3-Day Outlook

🌘 Waning Crescent

Today, May 14

76° / 47°

Chance of Rain: 0%
🌅 5:55 AM 🌇 8:21 PM

Friday, May 15

☁️

71° / 48°

Chance of Rain: 1%
🌅 5:54 AM 🌇 8:22 PM

Saturday, May 16

☁️

71° / 42°

Chance of Rain: 4%
🌅 5:53 AM 🌇 8:23 PM

Flow Trend & 7-Day Forecast

Source: USGS
Current (CFS)
7-Day Forecast
Historical Median
Normal Range (p25–p75)

Flow ranged from 1,330 to 1,640 CFS over the past 7 days. Current flow is 1,340 CFS. The historical median for this date is 3,723 CFS.

7-Day Water Temperature (°F)

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

Water temperature ranged from 54.3°F to 60.1°F over the past 7 days. Current temperature is 55.9°F.

Nearby Gauges