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USGS Daily Statistics for the Nation

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 12027500 CHEHALIS RIVER NEAR GRAND MOUND, WA


Thurston County, Washington
Hydrologic Unit Code 17100103
Latitude  46°46'34", Longitude 123°02'04" NAD27
Drainage area 895  square miles
Gage datum 0 feet above NAVD88
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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 1928-10-01 -> 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 5,780 5,880 4,980 4,370 1,990 1,020 558 255 267 578 2,000 5,310
2 5,860 5,850 5,010 4,040 1,950 1,030 538 252 278 526 2,080 5,850
3 6,100 5,580 4,830 3,750 1,890 1,050 519 249 281 510 2,220 6,580
4 6,140 5,150 4,740 3,470 1,920 1,010 503 249 273 531 2,330 6,850
5 6,370 5,090 4,720 3,460 1,950 982 480 245 299 546 2,490 6,360
6 6,850 5,180 4,750 3,530 1,980 946 462 242 301 531 2,490 6,050
7 7,180 5,570 4,560 3,450 1,890 949 447 239 306 556 2,660 5,850
8 7,380 5,850 4,290 3,380 1,760 1,010 430 242 284 531 2,780 5,430
9 7,070 5,950 4,340 3,370 1,620 997 432 243 277 642 2,700 5,150
10 6,890 5,600 4,890 3,310 1,550 973 432 235 296 724 2,590 5,670
11 6,520 5,420 5,010 3,200 1,490 970 426 229 300 757 2,660 6,170
12 6,440 5,270 4,910 3,230 1,440 928 411 224 299 738 3,040 6,320
13 6,570 5,350 5,050 3,330 1,380 894 398 222 289 705 3,520 6,290
14 6,610 5,330 4,910 3,340 1,360 837 399 223 286 707 4,010 6,250
15 6,650 5,200 4,920 3,460 1,350 817 386 221 300 698 4,230 6,160
16 6,710 5,540 5,080 3,300 1,360 837 379 223 325 744 4,220 6,100
17 6,710 5,920 4,750 3,090 1,390 830 375 222 353 764 4,240 6,130
18 6,580 6,180 4,430 2,940 1,370 818 364 220 373 834 4,340 6,280
19 6,640 5,980 4,280 2,750 1,320 798 347 217 384 894 4,500 6,380
20 6,500 5,870 4,210 2,740 1,300 775 336 219 389 1,020 4,820 6,430
21 6,380 5,710 4,190 2,660 1,260 751 326 220 391 1,130 4,920 6,860
22 6,280 5,720 4,180 2,450 1,220 731 316 219 375 1,180 4,860 6,890
23 6,310 5,860 4,180 2,410 1,200 709 308 231 368 1,300 4,990 6,770
24 6,550 5,550 4,270 2,550 1,160 726 299 246 400 1,260 5,310 6,390
25 6,820 5,460 4,310 2,520 1,130 686 292 254 386 1,320 6,070 6,010
26 6,750 5,420 4,070 2,310 1,090 685 285 269 365 1,430 6,120 5,800
27 6,260 5,190 4,100 2,170 1,050 639 279 269 375 1,520 5,670 6,210
28 6,000 5,110 4,190 2,170 1,030 613 276 264 386 1,550 5,330 6,680
29 5,920 6,730 4,300 2,090 1,040 606 272 261 500 1,720 5,090 6,700
30 5,880   4,610 1,990 1,020 591 266 262 537 1,650 4,920 6,720
31 5,940   4,620   992   260 274   1,730   6,390