How high is the Mermentau River @ Lake Arthur, LA right now?

The Mermentau River @ Lake Arthur, LA is currently flowing at -130 cubic feet per second with a gage height of 23.75 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Mermentau River @ Lake Arthur, LA normal for this time of year?

Current flow is classified as very high for June 11. Today's discharge is at the 24th percentile compared to the long-term historical record at this gauge.

What is the historical median flow for the Mermentau River @ Lake Arthur, LA on June 11?

The long-term median discharge for this date is 2,750 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 0 to unavailable cfs.

Where is the Mermentau River @ Lake Arthur, LA stream gauge located?

The Mermentau River @ Lake Arthur, LA stream gauge is operated by the USGS in Jefferson Davis Parish, LA on the Mermentau River @ Lake Arthur. USGS site number 08012400 (coordinates 30.0728, -92.6593).

Mermentau River @ Lake Arthur, LA

USGS Site No: 08012400 • Mermentau River @ Lake Arthur • Jefferson Davis Parish, LA

Mermentau River @ Lake Arthur, LA on the Mermentau River @ Lake Arthur is currently at -130 cfs (Very High — 24th percentile for this date) . Gage height: 23.75 ft.

Reading from 1 week ago

-130

CFS Discharge

23.75

Gage Height (ft)

Very High

Flow Condition

N/A

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold	Today's Flow
10th	Very Low threshold	0
25th	Low threshold	0
50th (Median)	Normal (median)	2,750	Today: -130 cfs
75th	High threshold	0
95th	Very High threshold	0

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	—	23.75
May 27, 2026	—	23.79
May 26, 2026	—	23.75
May 25, 2026	—	23.71
May 24, 2026	—	23.72
May 23, 2026	—	23.62
May 22, 2026	—	23.52
May 21, 2026	—	23.52
May 20, 2026	—	23.54
May 19, 2026	—	23.59
May 18, 2026	—	23.65
May 17, 2026	—	23.65
May 16, 2026	—	23.62
May 15, 2026	—	23.67
Apr 20, 2026	—	22.41
Apr 19, 2026	—	22.17
Apr 18, 2026	—	22.45
Apr 17, 2026	—	22.54
Apr 16, 2026	—	22.52
Apr 15, 2026	—	22.59
Apr 14, 2026	—	22.59
Apr 13, 2026	—	22.61
Apr 12, 2026	—	22.64
Apr 11, 2026	—	22.56
Apr 10, 2026	—	22.54
Apr 9, 2026	—	22.53
Apr 8, 2026	—	22.49
Apr 7, 2026	—	22.42
Apr 6, 2026	—	22.29
Apr 5, 2026	—	22.30

Station Information

USGS Site No: 08012400
State: LA
County: Jefferson Davis Parish
Coordinates: 30.0728, -92.6593
Drainage Area: 1,723 mi²
Datum (ft): -22.4
HUC Code: 08080202

View on USGS NWIS →

Nearby Gauges

Mermentau River at Mermentau, LA
9.1 mi · 0 cfs

Unknown
Byu Queue DE Tortue @ Riceville, LA
9.2 mi · 109 cfs

Normal
Bayou Lacassine Near Lake Arthur, LA
13.1 mi · 2,300 cfs

Very High
Bayou Des Cannes West Of Iota, LA
19.3 mi · 38 cfs

Very High
Byu Plaquemine Brule near Crowley, LA
19.3 mi · 48 cfs

Normal