Yellowknife River outlet of Prosperous Lake
Water level and flow at gauge 07SB002, Northwest Territories. The flow is below normal for October (50% 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 41 years of monthly averages): 21.3 m³/s752 cfs – 45.1 m³/s1,593 cfs, median 32.6 m³/s1,151 cfs. Right now it is at 50% of the median.
July 3, 1991 · approved records 1987–2017 (HYDAT). Right now the flow is 7% 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 40 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
A mix of sun and cloud. Clearing late this afternoon. Wind becoming south 20 km/h gusting to 40 near noon. High plus 2. Wind chill minus 13 this morning.
Clear. Becoming partly cloudy this evening. Wind south 20 km/h gusting to 40. Low minus 1.
Sunny. Wind southwest 20 km/h gusting to 40 becoming light in the afternoon. High plus 1. Wind chill minus 7 in the morning. UV index 1 or low.
Clear. Low minus 7.
Forecast for Yellowknife (14 km away) from Environment and Climate Change Canada, issued . Full official forecast ↗ · we check for new forecasts every 2 hours.
Nearby gauges
| Prosperous LakeMcMeekan Bay · 3 km | 158.11 m518.75 ft | Below normal |
| Baker CreekOutlet of Lower Martin Lake · 11 km | 28.95 m94.96 ft | Below normal |
| Yellowknife RiverInlet To Prosperous Lake · 13 km | 152.77 m501.20 ft | Below normal |
| Prelude LakeYellowknife · 13 km | 169.03 m554.57 ft | Below normal |
| Bluefish LakeYellowknife · 14 km | 185.76 m609.44 ft | Normal |
| Great Slave LakeYellowknife Bay · 15 km | 156.53 m513.56 ft | Normal |
About this gauge
Station: 07SB002 · Yellowknife River at Outlet of Prosperous Lake
Location: 62.5589, -114.2201 · Northwest Territories
Same river: Inlet To Prosperous Lake, Above Quyta Lake
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 Yellowknife River outlet of Prosperous Lake today?
The latest reading (Oct 25, 5 AM, local standard time) is — with a flow of 16.4 m³/s (579 cfs).
Is the Yellowknife River outlet of Prosperous Lake high right now?
The flow is below normal for October (50% of the median).
Is the Yellowknife River rising or falling?
In the last 24 hours it has been steady.
What is the highest flow ever recorded on the Yellowknife River outlet of Prosperous Lake?
234 m³/s (8,264 cfs) on July 3, 1991, the highest instantaneous flow in the approved records of the Water Survey of Canada (1987–2017). Events after 2017 are not yet in the approved archive.
Where does this data come from?
Gauge 07SB002 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.