St. Marys HUC8 04100004
A 2,054 km² sub-basin of the Great Lakes region in IN, OH. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
77
Healthy
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 7 reporting
Median flow
2012%
p98 of record
Water assets
386
0 springs · 90 wells
USGS gauges (11)
- JUNK DITCH AT FORT WAYNE, IN041827551 cfsp66 · normal
- SPY RUN CREEK NEAR PARK DRIVE AT FORT WAYNE, IN041828084 cfsp77 · above normal
- St Marys River at Walcot Street at Willshire OH04181049503 cfsp94 · much above normal
- St. Marys River at Rockford OH04180988406 cfsp98 · much above normal
- ST. MARYS RIVER AT MAIN ST. AT FORT WAYNE, IN041827691,390 cfsp98 · much above normal
- ST. MARYS RIVER AT DECATUR, IN04181500804 cfsp98 · much above normal
- ST. MARYS RIVER NEAR FORT WAYNE, IN041820001,320 cfsp99 · much above normal
- BLUE CREEK NR PLEASANT MILLS, IN0418110029 cfsno long-term record
- ST. MARYS RIVER AT PLEASANT MILLS, IN04181120575 cfsno long-term record
- DRAIN TILE NORTH OF CR 1000 N NR DECATUR, IN4053270845554010 cfsno long-term record
- OVERLAND FLOW NORTH OF CR 1000 N NR DECATUR, IN4053270845554020 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 0 | 0 | 0/7 | p98 |
Top water assets
- 65St. Marys River At Rockford Ohriver
- 65Blue Creek Nr Pleasant Mills, Inriver
- 65St. Marys River At Main St. At Fort Wayne, Inriver
- 65Spy Run Creek Near Park Drive At Fort Wayne, Inriver
- 65St. Marys River At Pleasant Mills, Inriver
- 65St. Marys River At Decatur, Inriver
- 65Blue Creekriver
- 65St. Marys River Near Fort Wayne, Inriver
- 65St Marys River At Walcot Street At Willshire Ohriver
- 65Forty Acre Pond Damreservoir