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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 -> 2020-09-30)

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
1 782 918 654 585 243 121 101 113 108 103 178 672
2 801 904 661 531 247 122 103 116 113 104 179 725
3 799 894 651 487 253 121 104 116 110 101 179 780
4 802 854 647 454 251 122 105 116 110 95 180 794
5 832 790 634 476 250 120 104 116 113 98 173 758
6 852 858 630 466 249 119 103 116 109 100 170 719
7 869 906 614 446 242 122 103 116 110 101 185 727
8 902 920 621 440 229 119 104 115 110 97 189 705
9 886 842 662 440 216 117 107 114 109 109 198 666
10 866 833 687 439 205 114 107 114 110 115 210 737
11 855 795 694 429 196 112 109 115 110 119 232 735
12 875 776 695 412 192 112 109 116 109 115 276 785
13 953 816 685 407 189 111 109 116 109 108 283 833
14 1,070 750 695 392 184 109 108 116 109 110 298 840
15 1,100 716 719 381 179 109 108 116 109 108 326 846
16 1,080 761 727 366 174 105 107 116 109 112 350 852
17 1,020 855 694 358 170 104 107 115 107 109 351 838
18 1,000 836 656 339 172 102 106 115 105 116 367 806
19 996 827 625 328 167 100 106 116 105 121 408 812
20 991 800 613 326 160 101 106 115 104 126 442 852
21 999 774 584 318 155 100 106 113 102 126 453 933
22 922 793 584 305 152 98 107 112 99 136 459 1,040
23 919 756 580 315 149 99 109 112 98 143 487 991
24 931 736 597 324 144 99 109 111 98 136 569 873
25 1,010 736 617 295 140 100 110 112 98 130 652 843
26 1,000 718 573 278 137 99 109 114 98 124 674 806
27 925 692 554 277 135 100 110 112 99 129 681 837
28 904 687 557 278 134 101 113 112 101 143 635 908
29 923 760 568 260 130 102 114 111 103 144 616 879
30 888   605 243 125 101 113 109 103 148 602 849
31 874   611   122   111 108   165   817