Radar tells you about rain that already fell. A gauge tells you what the bayou is doing with it. Harris County Flood Control’s Flood Warning System is the public board for that. If you live near a bayou, this is a now tool, not a hobby.
Pick the gauge on your stream, preferably upstream of your street or at the crossing you actually care about. Read the current stage, the flood stage they publish, and whether the line is going up or down. A falling rain total with a rising gauge is how people get caught after they “heard it was over.”
If you do not know your watershed, use the map, find the nearest named bayou, and then confirm with a neighbor who has lived through it. The name on the apartment pool is not a watershed.
Do this now
- Open the Harris County Flood Warning System and find the gauge on your bayou, not a random downtown camera.
- Write the gauge name, the current stage, and whether it is rising or falling.
- Compare that to any flood or action stage the site lists for that gauge.
- Check again before you move furniture back down or drive a bayou-adjacent road.
- If reservoirs sit upstream of you, check those related gauges too. One number is not the whole west side.
How to read a gauge without kidding yourself
Stage is a water-surface height at that location, not the depth in your living room. Flood stage is the level where that site expects trouble. If you are at 0.2 feet under flood stage and rising, you are not “fine.” You are early.
Look at the time stamps. A stalled gauge or a flat line in a monsoon is a reason to treat the data as stale and use your eyes plus OEM guidance.
Upstream is the one that warns you
A gauge a few miles up Brays, White Oak, Greens, Clear Creek, or Buffalo Bayou is more useful than a pretty park camera downstream of your slab. Water that is already at your street is information. Water that is still coming is a decision.
Houstonians often report watching a downstream gauge fall while their street was still filling from a late upstream peak. Check both if you can.
Rain dots are not a crest
The system also shows rainfall. That helps you understand why a ditch is angry. It does not replace stage. A two-inch cell over your block can flood a street that a bayou gauge still calls low. A reservoir release can lift Buffalo Bayou when your rain gauge is dry.
Use all the layers. Then still do not drive into water.
Share the link, not a cropped panic
When you text family, send the gauge name and the trend. A red screenshot with no time stamp starts rumors. If OEM or the City issues a release or a closure, that sentence sits next to the gauge, not under it.
If the site is overloaded the night of a storm, try again and use official social or OEM posts as a backup, not a random “live map” ad.
Verify live. Status changes hourly. Harris County Flood Warning System is the gauge source. Pair it with Harris County OEM, City of Houston, and TxDOT for what you should actually do. Stages change after you lock the door.
Do this next
- Addicks and Barker reservoir releases: what to do downstream
- Brays Bayou corridor: after-action checklist
- Shelters & evacuation hub
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