Atchafalaya HUC8 08080101
A 5,164 km² sub-basin of the Lower Mississippi region in LA. 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
76
Healthy
Drought index
119
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 3 reporting
Median flow
102%
p54 of record
Water assets
1,271
0 springs · 501 wells
USGS gauges (4)
- Atchafalaya River at Simmesport, LA07381490141,000 cfsp54 · normal
- Lower Atchafalaya River at Morgan City, LA0738160063,900 cfsp54 · normal
- Wax Lake Outlet at Calumet, LA0738159058,500 cfsp70 · normal
- Intracoastal Waterway southwest of Pierre Part, LA073815883,070 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 119 | 0 | 0/3 | p54 |
Top water assets
- 65Johnson Bayouriver
- 65Atchafalaya Riverriver
- 65Wax Lake Outlet At Calumet, Lariver
- 65Bayou Postillionriver
- 65Bayou Rougeriver
- 65Lower Atchafalaya River At Morgan City, Lariver
- 65Atchafalaya River At Simmesport, Lariver
- 65Giww At Bayou Sale Ridge Near Franklin, Lariver
- 65Fish Bayouriver
- 65Bayou Boutteriver