The US Geological Survey has a great dashboard for looking at a variety of surface water and groundwater information as well as rainfall and some atmospheric parameters. You can view the dashboard at https://dashboard.waterdata.usgs.gov/app/nwd/?aoi=default. I think it even has a tutorial available somewhere on the website, although I have not used it. In the streamflow map below, you can see the high stream levels associated with Hurricane Ida and TS Fred before that. Check it out!
