Mackenzie River at Fort Simpson
Water level and flow at gauge 10GC001, Northwest Territories. The flow is normal for October (101% of the median). In the last 24 hours it has been steady.
Latest reading Oct 25, 5 AM local standard time (2 hours ago) · data checked · we check every 30 minutes
Compared with a normal October
Normal for October (middle half of 66 years of monthly averages): 6,588 m³/s232,636 cfs – 8,155 m³/s287,991 cfs, median 7,050 m³/s248,969 cfs. Right now it is at 101% of the median.
June 13, 2012 · approved records 1968–2024 (HYDAT). Right now the flow is 27% of that record.
Last 30 days
Hourly readings · shaded: normal range for this month
This year compared with past years
Daily flow
Normal range: monthly averages of 62 years (lighter band: 10th–90th percentile). Past years: approved daily means from HYDAT, the Water Survey of Canada archive (the latest year published is 2025). 2026: daily means of the provisional real-time readings collected by Canada River Levels since October 22, 2026.
Weather near this gauge
Cloudy with 30 percent chance of flurries this morning. Clearing this afternoon. Fog patches dissipating near noon. Wind up to 15 km/h. High plus 2. Wind chill minus 10 this morning.
A few clouds. Fog patches developing this evening. Wind up to 15 km/h. Low minus 9. Wind chill minus 14 overnight.
Sunny. Increasing cloudiness late in the afternoon. Fog patches dissipating near noon. Wind up to 15 km/h. High minus 1. Wind chill minus 14 in the morning and minus 6 in the afternoon. UV index 1 or low.
Periods of snow. Low minus 3.
Forecast for Fort Simpson (1 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Martin RiverHighway No. 1 · 14 km | 1.85 m6.07 ft | Very low |
| Liard RiverThe Mouth · 16 km | 1.98 m6.48 ft | Very low |
| Mackenzie RiverStrong Point · 30 km | 7.23 m23.73 ft | Above normal |
| Jean-Marie RiverHighway No. 1 · 47 km | 1.63 m5.36 ft | Very low |
| Scotty CreekHighway No. 7 · 51 km | 2.90 m9.52 ft | Very low |
| Mackenzie RiverJean Marie River · 54 km | 94.58 m310.29 ft | No normal yet |
About this gauge
Station: 10GC001 · Mackenzie River at Fort Simpson
Location: 61.8684, -121.3589 · Northwest Territories
Same river: Fort Providence, Strong Point, Jean Marie River, Norman Wells, Sans Sault Rapids, Inuvik, Tununuk Point, Arctic Red River
Water levels are measured from a local reference point at each gauge, not from sea level, so they cannot be compared between gauges.
Official sources
For flood warnings, advisories and approved data, always use these official services:
Questions
What is the water level of the Mackenzie River at Fort Simpson today?
The latest reading (Oct 25, 5 AM, local standard time) is 4.67 m (15.32 ft) with a flow of 7,140 m³/s (252,147 cfs).
Is the Mackenzie River at Fort Simpson high right now?
The flow is normal for October (101% of the median).
Is the Mackenzie River rising or falling?
In the last 24 hours it has been steady.
What is the highest flow ever recorded on the Mackenzie River at Fort Simpson?
26,002 m³/s (918,253 cfs) on June 13, 2012, the highest instantaneous flow in the approved records of the Water Survey of Canada (1968–2024). Events after 2024 are not yet in the approved archive.
Where does this data come from?
Gauge 10GC001 of the Water Survey of Canada (Environment and Climate Change Canada). Real-time data are provisional and may be revised. We check for new readings every 30 minutes. Canada River Levels is not an official source.