St Marys River near Macclenny, FL Water Level Today

NWS river forecast

Forecast from the NOAA National Water Prediction Service. Issued a few times a day and only while a forecast is active. Not for navigation.

Last 30 days

About this gauge

USGS gauge 02231000 sits on the St Marys River and reads everything draining 700 square miles of the St. Marys basin. Its datum sits 40 feet above sea level NGVD29. Daily flow has been on record here since 1927, 100 years of it.

Where this gauge sits in the drainage

One gauged site sits upstream of here. The closest is North Prong St Marys River at Moniac, GA, reading 160 square miles. This gauge adds the 540 square miles that drain in between. Downstream the next reading comes from St Marys River at Ferry Landing near Folkston, GA at 1,190 square miles, so what passes this gauge is about 59% of the water measured there.

Normal flows here

The St Marys River runs a median of 232 cfs at this gauge across 100 years of record. August is the fullest month at a median 518 cfs, and May the leanest at 70 cfs. The highest daily mean on record is 33,300 cfs in 2012, and the lowest is 9.6 cfs in 2002.

Medians from the USGS daily-statistics record, 1927 to 2026. A month at 100% is running at its own long-term median.

Flood stages and record crests

The St Marys River reaches flood stage at this gauge at 12 feet. NWS starts watching it at 10 feet. The highest crest on record is 24.4 feet, in June 2012.

Flood categories and crest history from the NOAA National Water Prediction Service, gauge MACF1. Stages are gage height, not depth. Not for navigation.