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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 5,920 4,970 4,370 2,000 1,020 561 255 267 578 2,000 5,310
2 5,860 5,890 5,010 4,040 1,960 1,030 541 252 278 526 2,080 5,850
3 6,100 5,620 4,840 3,760 1,910 1,060 523 249 281 510 2,220 6,580
4 6,140 5,190 4,750 3,470 1,930 1,020 507 249 273 531 2,330 6,850
5 6,370 5,130 4,740 3,470 1,970 986 483 245 299 546 2,490 6,360
6 6,850 5,220 4,770 3,540 1,990 950 465 242 301 531 2,490 6,050
7 7,180 5,610 4,580 3,460 1,900 952 449 239 306 556 2,660 5,850
8 7,400 5,900 4,310 3,360 1,770 1,010 432 242 284 531 2,780 5,430
9 7,100 6,000 4,360 3,320 1,630 1,000 432 243 277 642 2,700 5,150
10 6,920 5,650 4,920 3,270 1,560 978 432 235 296 724 2,590 5,670
11 6,550 5,460 5,040 3,180 1,500 976 426 229 300 757 2,660 6,170
12 6,470 5,310 4,940 3,220 1,450 934 411 224 299 738 3,040 6,320
13 6,610 5,390 5,080 3,320 1,390 900 398 222 289 705 3,520 6,290
14 6,650 5,370 4,930 3,350 1,370 842 399 223 286 707 4,010 6,250
15 6,690 5,240 4,940 3,470 1,360 823 386 221 300 698 4,230 6,160
16 6,750 5,580 5,080 3,310 1,360 843 379 223 325 744 4,220 6,100
17 6,750 5,950 4,750 3,100 1,400 836 375 222 353 764 4,240 6,130
18 6,630 6,200 4,430 2,950 1,380 824 364 220 373 834 4,340 6,280
19 6,690 6,000 4,290 2,760 1,330 804 347 217 384 894 4,500 6,380
20 6,550 5,880 4,220 2,750 1,300 780 336 219 389 1,020 4,820 6,430
21 6,430 5,730 4,180 2,670 1,270 756 326 220 391 1,130 4,920 6,860
22 6,330 5,740 4,140 2,460 1,220 735 316 219 375 1,180 4,860 6,890
23 6,360 5,860 4,160 2,420 1,210 712 308 231 368 1,300 4,990 6,770
24 6,600 5,510 4,240 2,560 1,160 730 299 246 400 1,260 5,310 6,390
25 6,870 5,390 4,280 2,530 1,130 690 292 254 386 1,320 6,070 6,010
26 6,800 5,280 4,050 2,320 1,090 690 285 269 365 1,430 6,120 5,800
27 6,310 5,100 4,090 2,180 1,050 643 279 269 375 1,520 5,670 6,210
28 6,060 5,070 4,180 2,190 1,030 617 276 264 386 1,550 5,330 6,680
29 5,970 6,730 4,270 2,100 1,050 610 272 261 500 1,720 5,090 6,700
30 5,930   4,600 2,000 1,030 595 266 262 537 1,650 4,920 6,720
31 5,990   4,610   995   260 274   1,730   6,390