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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
70
Moderate
Drought index
189
Moderate
Area in D2+
2.26%
0% exceptional (D4)
Gauges below normal
0%
of 3 reporting
Median flow
117%
p60 of record
Water assets
1,271
0 springs · 501 wells
USGS gauges (4)
- Lower Atchafalaya River at Morgan City, LA0738160059,600 cfsp40 · normal
- Atchafalaya River at Simmesport, LA07381490141,000 cfsp60 · normal
- Wax Lake Outlet at Calumet, LA0738159062,000 cfsp76 · above normal
- Intracoastal Waterway southwest of Pierre Part, LA07381588no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 189 | 2.26 | 0/3 | p60 |
| 2026-10-20 | 189 | 2.26 | 0/3 | p62 |
| 2026-10-19 | 189 | 2.26 | 1/3 | p56 |
| 2026-10-18 | 189 | 2.26 | 1/3 | p60 |
| 2026-10-17 | 189 | 2.26 | 0/3 | p76 |
| 2026-10-16 | 189 | 2.26 | 1/3 | p69 |
| 2026-10-15 | 155 | 2.26 | 1/3 | p72 |
| 2026-10-14 | 155 | 2.26 | 1/3 | p65 |
| 2026-10-13 | 155 | 2.26 | 0/3 | p61 |
| 2026-10-12 | 155 | 2.26 | 0/3 | p66 |
| 2026-10-11 | 155 | 2.26 | 0/3 | p61 |
| 2026-10-10 | 155 | 2.26 | 0/3 | p72 |
| 2026-10-09 | 155 | 2.26 | 0/3 | p78 |
| 2026-10-08 | 170 | 0.5 | 0/3 | p78 |
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