L Pontchartrain at Crossover 4 near Mandeville water level
USGS gauge 301200090072400 · St. Tammany Parish · New Orleans and the Northshore · NWS gauge MDLL1
gage height, Oct 23, 2026 at 3:00 PM CDT · 2 hours ago
- Highest since 2017 (USGS)
- 6.73 ft (August 29, 2021)
- Usual range
- 0.44 to 1.79 ft
USGS marks recent readings as provisional: they can be revised after review.
Last 7 days
Hourly averages of USGS readings. The shaded band is this gauge's usual range: the middle 80% of its readings since September 11, 2026.
How to read this gauge
Gage height is the height of the water surface above the gauge's zero point. This gauge's zero is set at 0 ft NAVD88, so its gage height is the water surface elevation above that datum. It is not a water depth.
Daily highs and lows since September 11, 2026
Annual peaks since 2017
In 10 complete water years of comparable USGS records (since 2017), the highest peak was 6.73 ft on August 29, 2021. So far in water year 2027 (since October 1) the highest reading is 3.11 ft on October 9, 2026, higher than the annual peak in 4 of 10 years.
Each dot is the highest gage height of a water year (October to September), from the USGS annual peak record, with recent years USGS has not published yet taken from its 15-minute readings and this site's own; hover a dot for its date. Dashed lines are NWS flood stages.
NWS historic crests
| Date | Crest | Above minor flood stage |
|---|---|---|
| October 29, 1985 | 6.14 ft | — |
| July 30, 1995 | 4.77 ft | — |
The highest crests the National Weather Service lists for this gauge, as published. They can differ from the USGS annual peaks above: USGS records the year's highest gage height, which is not always the crest the NWS lists for the same flood.
Download the readings
l-pontchartrain-at-crossover-4-near-mandeville.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,045 rows, with time in UTC and Central, gage height in feet, and the USGS approval status.
Source. Gage height from the U.S. Geological Survey. This site is not affiliated with either agency.