Howdy,
The data source for the depth stuff became no longer available. Based on that and the minimal amount of overall site traffic it was connected to those features were deprecated.
The main function of the weather page is as an offramp to current weather along with the webcam.
There is a real good historical weather archive at:
https://climate.weather.gc.ca/historical_data/search_historic_data_e.html
The Brandon page on Weatherstats at
https://brandon.weatherstats.ca also has some features you might find useful.