Cumulative rain using ERA5-Land from July 26th to July 31st in the South Nahanni River basin, as defined by the WSC gauge 10EB001.

Outflows from below the dam(s) in 2023, 2024 and 2025 relative to IQR

2024 and 2025 levels relative to IQR

SWE map April 2025 - in progress

Combination of gridded SWE using ERA5-Land and snow survey data.

Combination of gridded SWE using ERA5-Land and snow survey data.

Combination of gridded SWE using ERA5-Land and snow survey data.

ERA5-Land are presented as per cent of normal (2025 value) relative to hourly SWEmax from 1995-2024. Snow surveys are conducted by the Yukon and Alberta Government.

SWE values are presented in percent of normal, relative to the maximum accumulation for each season from 1995 - 2024. These percentages of normal are "interim" values because the snowfall season is still in progress.

This is a map of on-the-ground snow surveys in the Mackenzie River basin for Spring 2024, created by the Department of Environment and Climate Change (ECC) within the Government of the Northwest Territories. Snow surveys can give us an idea of how much water will be produced when the snow melts in the spring. This value is called the ‘Snow Water Equivalent’ or ‘SWE’. The map compares SWE values collected in 2024 relative to average values. Clicking on each dot will display the amount of SWE and the snow depth measured at each site, as well as the number of years that data have been collected. ECC staff collected the data in the NWT, while data from outside of the NWT was sourced from our neighbouring jurisdictions (Yukon, British Columbia, and Alberta). ECC would also like to thank the Northwest Territories Power Corporation for their ongoing support of the snow survey program.

using 2022 data

Basic map of ECC-Waters climate stations

Discharge measured at 07OB001 from 2017-2020.

Discharge measured at 07OB001 for the years 2022-2024.

Flows from 1963-1966

Prelude Lake water levels, 2019-2023.

Cameron River below Reid lake flows. Discharge axis has been log converted to more easily view changes.

Interactive plot of historic and real-time water levels measured by WSC. Gauge number is labelled in the plot title.