Current River Flow Data

For years I did not pay much attention to river flow levels. If i had
some time to fish I just showed up and whatever was happening, whether
at flood or dewatered, I was there and made the best of it.

But the last few years, and especially since I bought a streach, Ive
been paying much more attention. Washington state has a pretty
extensive set of flow and temp measuring stations linked by telemetry
to a website.

https://fortress.wa.gov/ecy/wrx/wrx/...asp?sta=32B110

What are other States doing? Where do you go for current flow data?
How close to realtime is the data you can access?

Dave