Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins

USGS Daily Statistics for the Nation

! Statistics pages will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline.

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 08012400 Mermentau River @ Lake Arthur, LA


Jefferson Davis Parish, Louisiana
Hydrologic Unit Code 08080202
Latitude  30°04'22.2", Longitude  92°39'33.4" NAD83
Drainage area 1,723  square miles
Gage datum -22.37 feet above NAVD88
Output formats
HTML table of all data
Tab-separated data
Reselect output format

00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 2022-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 5,650 15,900 127 2,270 3,260 2,790 1,850 3,180 224 9 -202 5,200
2 4,790 15,300 -179 1,270 2,340 3,250 1,170 2,750 461 -457 -430 5,330
3 5,320 15,200 310 1,750 3,960 3,850 1,430 2,670 314 -481 -753 5,750
4 4,610 15,300 1,450 69 4,600 2,950 1,720 2,720 548 -90 -663 5,260
5 4,700 14,800 815 1,530 4,340 3,240 1,890 1,460 710 176 577 3,400
6 4,880 12,300 1,680 2,110 3,810 4,340 2,690 1,340 1,910 344 886 2,910
7 4,430 9,860 1,060 6,430 4,150 4,170 1,800 1,540 2,150 71 759 1,550
8 4,010 8,000 1,720 7,710 3,910 3,230 625 1,550 2,070 81 382 1,430
9 7,860 9,210 3,090 8,080 3,710 3,270 3,650 977 1,090 -156 176 1,520
10 6,710 8,300 1,720 10,100 4,210 3,180 2,740 783 1,260 -684 272 1,550
11 4,980 8,400 806 11,700 2,930 2,750 2,700 422 1,330 -562 231 1,500
12 5,450 7,990 2,130 10,100 2,800 2,380 2,870 526 702 -560 338 2,840
13 4,030 5,530 1,110 7,560 3,640 2,050 2,960 791 1,150 -195 -254 2,600
14 2,340 4,030 643 5,630 5,000 1,740 2,670 819 1,050 132 -253 3,720
15 2,790 4,400 1,010 4,770 5,980 1,100 2,380 935 799 151 1,070 4,310
16 1,650 4,670 1,020 4,810 4,550 817 2,580 457 661 26 670 5,820
17 1,370 6,310 3,570 3,680 6,500 2,030 2,810 536 401 -295 475 6,490
18 209 2,400 5,210 3,040 6,300 2,210 2,990 1,020 -192 -432 93 6,930
19 2,300 2,670 3,300 2,970 6,880 1,450 3,300 742 212 -507 207 6,790
20 1,920 2,810 2,380 2,600 7,700 1,100 3,170 609 228 -73 293 8,270
21 2,430 2,720 2,790 2,990 8,190 1,340 3,460 -213 -468 -21 1,010 8,430
22 3,730 1,100 3,930 1,900 6,990 899 3,920 -69 83 -271 595 8,090
23 4,190 3,300 4,070 1,730 5,860 1,320 3,050 102 230 -256 -117 7,760
24 2,970 1,830 1,730 1,430 4,680 1,660 2,980 43 623 -281 -334 6,020
25 9,890 1,260 3,710 803 3,720 1,670 4,440 21 986 487 435 6,020
26 11,000 1,080 3,970 -23 2,610 1,890 5,290 364 308 88 1,270 4,660
27 11,900 831 2,810 1,050 2,850 1,720 5,440 441 -351 -132 -570 4,170
28 12,400 2,370 2,180 1,000 2,500 1,780 5,130 370 -29 -0.35 -618 3,590
29 13,200 114 1,230 3,370 3,070 1,620 4,660 314 -374 294 -650 2,580
30 16,000   1,130 3,100 2,690 1,720 4,180 363 -349 440 3,470 3,910
31 16,500   781   2,760   3,860 -3   -63   5,050