NWT Water Monitoring Bulletin

Current Status:
Hydrometric station map:
Information on interpreting figures:
- Water level and flow figures:
- Climate figures:
Water level and flow data:
Climate data:

NWT Water Monitoring Bulletins are posted monthly. These bulletins are intended to provide an update of water flow and level data at select NWT Hydrometric Network gauge stations across the Northwest Territories.

Where available, data from river sites are presented as water level or flow (discharge) and data from lake sites are presented as level. The figures in this report represent current conditions for this year, relative to historic minimum and maximum values, as well as the average range, which is calculated as the interquartile range.

The NWT Hydrometric Network is a partnership between ECC and Environment and Climate Change Canada (ECCC) and is operated by the Water Survey of Canada (ECCC). Both historic and real-time data for all stations are available at https://wateroffice.ec.gc.ca/index_e.html. All 2023 and 2024 data are considered provisional and may contain values that are later corrected.

Any questions regarding information contained in this Bulletin can be directed to NWTWaters@gov.nt.ca.

Current Status:

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Hydrometric station map:

Above - A map of the hydrometric stations included in this report.

Information on interpreting figures:

Water level and flow figures:

The light blue line shows water levels/flows from last year (2023), while the dark blue line shows current water levels/flows from 2024. The dark grey band represents the average range (calculated as the interquartile range), while the light grey bands represent the highest and lowest levels or flows on record. If the dark blue line is within the dark grey band, current conditions can be assumed to be normal.

Note: The grey bands are calculated for data prior to 2023. If the line from 2023 or 2024 is above (below) the grey band, it means that the water level or flow from that year was the highest (lowest) on record.

Climate figures:

Monthly air temperature and precipitation data are displayed for six communities in the NWT (Fort Smith, Hay River, Yellowknife, Fort Simpson, Norman Wells, and Inuvik) and presented as box and whisker plots. The box in each plot represents the average range (calculated as the interquartile range) for each month, and the whiskers are the vertical black lines that represent the extreme values (10th to 90th percentiles). Each grey dot is the value from a previous year, beginning in 1950. The red or blue dots represent the values for the current year. These data are acquired and managed by Environment and Climate Change Canada.

Water level and flow data:

Slave River at Fitzgerald [07NB001]:

Hay River near Hay River [07OB001]:

Taltson River below Hydro Dam [07QD007]:

Lockhart River at outlet of Artillery Lake [07RD001]:

Coppermine River below Desteffany Lake [10PA001]:

Great Slave Lake at Yellowknife Bay [07SB001]:

Great Slave Lake at Hay River [07OB002]:

Cameron River below Reid Lake [07SB010]:

Prosperous Lake near McMeekan Bay [07SB014]:

Prelude Lake near Yellowknife [07SB017]:

La Martre River below outlet of Lac La Martre [07TA001]:

South Nahanni River above Virginia Falls [10EB001]:

Liard River near the Mouth [10ED002]:

Mackenzie River at Fort Simpson [10GC001]:

Mackenzie River at Norman Wells [10KA001]:

Great Bear River at outlet of Great Bear Lake [10JC003]:

Note: Only sparse 2024 data are available for 10JC003.

Great Bear Lake at Hornby Bay [10JE002]:

Arctic Red River near the Mouth [10LA002]:

Peel River above Fort McPherson [10MC002]:

Mackenzie River at Arctic Red River [10LC014]:

Mackenzie River (East Channel) at Inuvk [10LC002]:

Mackenzie River (Peel Channel) above Aklavik [10MC003]:

Climate data:

Summary data:

Precipitation in this figure shows the combined amount of rain and snow water equivalent (i.e., amount of water that results from when a snowpack is melted) that has fallen in select communities a) across the NWT; and b) in British Columbia and Alberta within the Great Slave Lake basin. This figure shows precipitation from the start of April until June 04. The blue dot is the current year, and the grey dots are all previous years from 1950 to present.