USGS stream,river,lake level and other info site
https://waterdata.usgs.gov/ky/nwis/rt
This website is vey handy, but tough to navigate. For KY, look like 335 sites are listed for current information on the streams, rivers and some lakes in KY. I think the data is updated about every hour via satellite transmission from the measurement sites. You can do this for any state, but the link above is only for KY data. You can wear yourself out at this site looking at current and past history if you select the various criteria options. Once you select what data you want, you will be given a report based on your criteria you set up in your search.
Let me know if anyone is currently using this site. I used it a lot in SC at Santee to see how big a wall of water was heading into Lake Marion from the two rivers that feed the lake after a huge rain event.