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USGS Surface-Water Daily Statistics for Oregon

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 14207500 TUALATIN RIVER AT WEST LINN, OR


Clackamas County, Oregon
Hydrologic Unit Code 17090010
Latitude  45°21'03", Longitude 122°40'30" NAD27
Drainage area 706  square miles
Gage datum 85.61 feet above NGVD29
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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 3,920 3,670 3,270 2,360 1,010 446 211 106 120 177 467 2,180
2 3,930 3,650 3,210 2,300 979 434 203 104 119 178 507 2,260
3 3,860 3,640 3,130 2,260 960 428 195 103 122 176 527 2,360
4 3,800 3,570 3,060 2,210 947 426 191 102 125 174 549 2,470
5 3,700 3,510 2,990 2,150 941 422 187 101 123 170 576 2,520
6 3,700 3,580 2,940 2,080 942 415 184 101 129 171 609 2,590
7 3,730 3,590 2,880 1,990 927 413 176 101 130 174 636 2,650
8 3,700 3,620 2,810 1,940 898 411 170 103 127 177 651 2,660
9 3,670 3,710 2,790 1,890 863 406 167 105 126 182 675 2,650
10 3,700 3,710 2,790 1,850 832 399 162 104 129 199 704 2,680
11 3,720 3,600 2,750 1,810 797 396 160 101 134 223 744 2,730
12 3,740 3,520 2,750 1,770 760 376 155 102 131 230 798 2,790
13 3,820 3,480 2,800 1,770 727 357 151 104 129 229 857 2,860
14 3,880 3,410 2,830 1,740 705 346 147 103 128 225 896 2,870
15 3,920 3,370 2,880 1,700 697 335 144 103 136 228 956 2,890
16 3,900 3,420 2,910 1,670 683 323 139 103 139 225 1,050 2,980
17 3,970 3,460 2,910 1,620 674 312 138 105 144 228 1,100 3,060
18 4,150 3,490 2,880 1,570 659 301 139 106 152 234 1,160 3,080
19 4,190 3,550 2,840 1,510 649 290 137 105 163 237 1,280 3,130
20 4,200 3,570 2,770 1,450 632 279 134 106 166 255 1,400 3,260
21 4,180 3,530 2,680 1,390 616 275 129 110 160 271 1,430 3,430
22 4,150 3,500 2,600 1,340 608 270 126 113 153 291 1,500 3,600
23 4,130 3,470 2,540 1,300 601 258 121 118 149 309 1,590 3,720
24 4,090 3,460 2,480 1,270 583 247 116 117 147 327 1,700 3,720
25 4,030 3,400 2,450 1,220 564 243 115 117 147 326 1,810 3,690
26 3,960 3,340 2,400 1,180 538 238 113 119 149 330 1,910 3,640
27 3,940 3,320 2,360 1,150 523 232 112 120 151 344 2,000 3,730
28 3,920 3,300 2,350 1,120 510 225 110 118 154 354 2,070 3,730
29 3,850 3,390 2,380 1,080 500 221 107 118 161 370 2,120 3,800
30 3,750   2,400 1,050 482 218 108 120 173 392 2,140 3,880
31 3,690   2,390   462   108 121   423   3,930