Colorado River in the Grand Canyon, Arizona context
Colorado River flow through the Grand Canyon is strongly influenced by upstream dam releases, making current observations essential for interpreting conditions.
This page presets the national river tool to the Grand Canyon area and uses the live gauge discovery system rather than a generic Colorado River summary.
Mississippi River at St. Louis, Missouri · Ohio River at Cincinnati, Ohio · Missouri River at Omaha, Nebraska · Potomac River at Washington, D.C. · Columbia River near Portland, Oregon
Colorado River in the Grand Canyon, Arizona river conditions
Find the monitored rivers near you first. Choose the river and, when needed, the USGS monitoring point you care about. Then open its live flow, trend, history and forecast context.
Works anywhere in the United States: tap Use my location for conditions near me, or type any U.S. city or ZIP code.
Optional. Your browser shares a location rounded to about 0.001° only after you tap. It is used to load nearby conditions and is not included in analytics.
River intelligence is not a safety score
“High,” “low,” “rising,” temperature, turbidity and other readings describe monitored river conditions. They do not establish whether a river is safe, navigable, swimmable, fishable or wadable. Local hazards, access, regulations and conditions away from a gauge still matter.
More than flow, where the gauge supports it
USGS stations vary. Some report only discharge; others also report stage, water temperature, turbidity, dissolved oxygen, conductivity or pH. The tool shows only parameters actually returned by that gauge and keeps NOAA/NWS forecast context separate from observations.
River condition questions this tool answers
What rivers are monitored near me?
Tap Use my location or enter a city or ZIP code. The tool first lists nearby rivers and streams that have active USGS instantaneous streamflow monitoring. Choose the river you care about, then choose a monitoring point when that river has more than one nearby gauge. Live readings do not load until you make that choice.
What is the difference between cfs and gage height?
Discharge in cubic feet per second is the volume of water moving past the gauge. Gage height in feet is how high the water sits against that gauge's own datum, which is local to the station. Two rivers at "four feet" are not comparable, while their flows are.
Is the river safe to paddle, fish, or swim?
This tool cannot tell you that, and it deliberately does not try. A gauge reports what the water is doing at one point. It does not know about strainers, a low-head dam, water quality, your skill, your boat, or a hazard that moved in last week. Use the readings as inputs and get the safety call from local knowledge and current advisories.
Is this flow high or low for the date?
Where the station supports it, the tool loads same-date USGS historical percentiles, which compare today's reading against the record for this calendar day rather than against the whole year. That is the honest way to say "high for early September" instead of just "high".
What is going to happen next?
Where NOAA's National Water Prediction Service publishes an official forecast for the exact gauge, it is shown separately from the observations. Nothing is invented for gauges that have no forecast.
Why do some gauges show more than flow?
USGS stations are instrumented differently. Some report only discharge; others add stage, water temperature, turbidity, dissolved oxygen, conductivity or pH. The page shows the sensors that station actually carries rather than blank fields for the ones it does not.