Reston, Virginia - USGS recorded historic flooding in South Louisiana on its streamgage network, with 30 registering above flood stage over the course of several days. At least six streamgages set a peak of record, four of which have been in operation for more than 30 years. In addition, two streamgages showed a rise of 30 feet in two to three days.

In addition to the realtime streamgages recording above flood stage for several days, several streamgages were damaged during the flooding. Many of these gages were overcome by flood waters, while some were destroyed by debris carried by the fast moving water.

In the graphs created by the streamgage data, the timeline of the flooding becomes clear. Here are several hydrographs derived from data collected at three USGS streamgages in south Louisiana:

USGS crews are out servicing all of the affected streamgages, and they will continue to report streamflow and river height information. In addition, USGS scientist will survey high-water marks and make indirect measurements to determine streamflow where streamgages suffered damage or at locations where previously measured streamflow have exceeded peak of record.

USGS monitors water conditions in Louisiana at 261 sites using streamgages and other measuring instruments. This information provides important data for agencies like the National Weather Service for flood forecasting, infrastructure information for the U.S. Army Corps of Engineers and state agencies, and water alerts for the general public.