Working prototype by Stoa Works — a concept for Indiana's On-line Water Data Portal, not the official State site.
Indiana WaterData Portal · concept

Streamflow conditions

Real-time discharge and gage height for every reporting streamgage in Indiana. Sort by flow, filter by county, search for a river — then download the live view as CSV.

Source & cadence. Discharge (ft³/s) and gage height (ft) come from the USGS National Water Information System, typically updated every 15–60 minutes. Values marked provisional by USGS are subject to revision. “Updated” shows the age of each gage's latest reading.