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USGS 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 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 -> 2021-09-30)

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
1 782 918 648 582 241 121 102 114 110 103 178 666
2 801 904 655 529 245 122 104 118 115 104 178 719
3 799 894 645 485 251 121 105 117 112 102 178 772
4 802 854 642 452 249 122 105 117 112 96 180 786
5 832 790 629 473 248 121 105 118 115 98 173 751
6 852 858 625 463 248 119 103 117 111 100 171 712
7 869 906 609 443 240 122 104 117 112 101 185 720
8 902 920 617 436 227 119 104 116 112 98 188 698
9 886 842 657 436 214 117 108 115 112 109 198 659
10 866 833 681 436 203 115 108 115 112 116 208 729
11 855 795 688 425 195 112 109 116 112 119 231 728
12 875 776 689 408 191 112 110 117 111 118 274 777
13 953 816 679 404 187 111 110 117 111 110 283 825
14 1,070 750 689 389 183 109 108 118 110 112 300 832
15 1,100 716 712 378 178 109 109 118 111 109 328 838
16 1,080 761 720 363 173 105 108 118 110 113 352 846
17 1,020 855 688 354 169 104 108 117 108 109 351 834
18 1,000 836 650 336 171 102 108 117 106 116 368 803
19 996 827 620 325 166 101 107 117 106 121 410 809
20 991 800 607 323 159 101 107 116 105 126 443 855
21 999 768 579 315 154 101 107 114 103 126 453 933
22 922 786 579 303 151 98 108 113 100 136 458 1,040
23 919 750 574 313 148 99 110 113 99 142 485 991
24 931 730 591 321 143 99 110 112 99 136 565 873
25 1,010 730 611 293 139 101 112 113 99 130 647 843
26 1,000 712 568 275 137 99 111 115 99 124 669 806
27 925 686 548 275 135 100 112 114 100 129 675 837
28 904 681 552 276 134 101 115 113 101 143 630 908
29 923 733 563 258 130 103 116 112 103 144 611 879
30 888   601 241 125 102 115 110 104 148 597 849
31 874   608   122   113 109   165   817