River stage and flow on the Mississippi main stem, captured at each source's own cadence and sealed as published.
Capturing and sealing today.
Height of the water surface at the gauge, in feet, on the gauge's own datum.
Volume of water passing the gauge per second.
Temperature at the sensor depth the operator publishes.
Suspended sediment as the operator's instrument reports it.
Managed pool levels where the operator publishes them.
The vertical reference the stage is measured against — where one is registered.
An instrument read a value at a place and a time.
Measured at a fixed station. The record discloses which one and how far it is from you.
Published by an authoritative operator of the instrument.
Roughly 80 of our 102 stations have no registered vertical datum. Stage at those gauges is real and sealed, but comparing it to another station's stage returns INCOMPARABLE rather than a number. Corridor-wide comparability is not a thing we have yet, and we would rather say so than publish a difference that means nothing.
Every record names which of these served it, with the URL you can check yourself.
A tow grounds and the operator says the fall was unforeseeable. A flood claim turns on when the crest arrived. A force majeure clause turns on whether a reach was navigable.
That framing is our analysis of where disputes arise, not a claim of fact about any matter.
102 stations from Bemidji, Minnesota to Empire, Louisiana — ten states, the full main stem. This is where the method was proved, not the limit of what it covers.
A wave takes days to travel the corridor, so an upstream reading is a downstream forecast — which is why coverage end to end matters more than coverage near you.
This lane is live, so these are real. Every other lane on this site asks you what you need instead — nothing is sold for data we are not capturing.