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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
1 787 904 654 585 243 121 101 111 106 103 179 679
2 805 891 661 531 247 122 102 114 112 103 180 733
3 804 882 651 487 253 121 103 114 108 101 180 789
4 807 845 647 454 251 121 104 114 108 95 181 803
5 838 784 634 476 250 120 104 115 111 98 174 767
6 856 857 630 466 249 119 102 115 108 99 171 727
7 869 907 614 446 243 122 103 114 109 101 186 735
8 902 921 621 440 230 119 103 114 108 97 190 713
9 886 843 662 440 217 117 107 112 108 109 200 673
10 867 834 687 439 206 114 106 112 108 115 211 745
11 855 797 694 429 197 111 108 114 109 118 234 743
12 873 779 695 412 193 111 108 114 108 115 278 792
13 949 821 685 407 190 110 109 114 108 108 285 840
14 1,070 754 695 392 185 108 107 115 108 109 301 848
15 1,110 720 719 381 180 108 107 115 109 108 328 854
16 1,080 765 727 366 175 104 106 115 108 112 353 861
17 1,020 860 694 358 170 103 106 114 107 108 354 847
18 1,000 842 656 339 173 101 105 114 105 115 371 815
19 996 833 625 328 167 99 105 115 105 119 411 821
20 991 807 613 326 160 100 105 114 104 125 445 858
21 999 774 584 318 155 99 105 112 102 125 457 934
22 921 793 584 305 152 96 106 111 99 136 464 1,040
23 917 756 580 315 150 97 107 111 98 142 492 994
24 924 736 597 324 144 97 108 110 98 136 575 877
25 1,010 736 617 295 140 99 109 111 98 130 659 849
26 997 718 573 278 138 98 108 112 98 124 682 813
27 918 692 554 277 136 99 109 111 99 129 688 844
28 889 687 557 278 135 100 112 110 100 143 642 917
29 906 760 568 260 131 102 112 109 103 145 623 888
30 873   605 243 125 100 111 108 103 148 609 858
31 861   611   122   110 106   166   825