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USGS Daily Statistics for Oregon

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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 14203500 TUALATIN RIVER NEAR DILLEY, OR


Washington County, Oregon
Hydrologic Unit Code 17090010
Latitude  45°28'30", Longitude 123°07'23" NAD27
Drainage area 125  square miles
Gage datum 147.57 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 1939-10-01 -> 2019-09-30)

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
1 787 904 658 590 244 121 101 111 106 103 179 679
2 805 891 666 536 248 122 102 114 112 103 180 733
3 804 882 656 491 254 121 103 114 108 101 180 789
4 807 845 653 458 252 121 104 114 108 95 181 803
5 838 792 639 479 251 120 104 115 111 98 174 767
6 856 866 635 468 251 119 102 115 108 99 171 727
7 869 917 618 445 243 122 103 114 109 101 186 735
8 902 931 626 436 230 119 103 114 108 97 190 713
9 886 851 668 435 217 117 107 112 108 109 200 673
10 867 843 693 435 206 114 106 112 108 115 211 745
11 855 804 700 424 197 111 108 114 109 118 234 743
12 873 776 701 408 193 111 108 114 108 115 278 792
13 949 813 690 405 190 110 109 114 108 108 285 840
14 1,070 751 701 390 185 108 107 115 108 109 301 848
15 1,110 719 725 380 180 108 107 115 109 108 328 854
16 1,080 765 732 365 175 104 106 115 108 112 353 861
17 1,020 862 700 357 170 103 106 114 107 108 354 847
18 1,000 845 660 339 173 101 105 114 105 115 371 815
19 996 837 629 328 167 99 105 115 105 119 411 821
20 991 811 616 326 160 100 105 114 104 125 445 858
21 999 779 587 318 155 99 105 112 102 125 457 934
22 921 798 588 306 152 96 106 111 99 136 464 1,040
23 917 761 583 316 150 97 107 111 98 142 492 994
24 924 740 601 325 144 97 108 110 98 136 575 877
25 1,010 741 622 296 140 99 109 111 98 130 659 849
26 997 723 578 279 138 98 108 112 98 124 682 813
27 918 697 558 279 136 99 109 111 99 129 688 844
28 889 692 561 280 135 100 112 110 100 143 642 917
29 906 760 573 261 131 102 112 109 103 145 623 888
30 873   611 245 125 100 111 108 103 148 609 858
31 861   616   122   110 106   166   825