Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins

USGS Surface-Water Daily Statistics for the Nation

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
Output formats
HTML table of all data
Tab-separated data
Reselect output format

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 -> 2023-09-30)

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
1 789 907 660 573 242 123 104 118 112 105 176 661
2 808 895 664 520 245 124 106 121 118 105 176 709
3 814 887 650 477 250 123 107 121 115 103 176 760
4 822 847 643 447 248 124 107 121 115 97 180 772
5 848 784 629 469 247 124 107 121 117 99 180 738
6 867 850 623 458 248 123 105 121 114 101 176 700
7 893 896 606 439 243 124 106 120 115 102 188 707
8 923 909 612 432 231 121 106 120 115 99 192 686
9 900 832 650 431 219 119 110 118 115 110 200 649
10 877 821 673 431 206 118 110 118 115 116 210 721
11 866 783 679 421 197 115 111 120 115 120 232 724
12 891 764 679 406 193 115 113 121 114 118 280 778
13 994 803 669 402 192 113 114 121 114 111 293 829
14 1,090 740 680 388 189 111 112 122 113 112 307 837
15 1,110 708 702 377 185 110 112 122 113 110 331 840
16 1,080 753 710 363 180 107 111 121 112 114 353 846
17 1,030 845 678 354 174 106 111 120 110 110 351 834
18 1,010 826 641 336 176 104 111 121 109 117 366 802
19 1,000 817 611 324 171 103 110 120 109 121 406 811
20 995 792 600 323 163 103 110 119 107 126 438 860
21 999 760 572 316 158 102 110 117 105 126 447 948
22 921 777 573 305 154 99 111 116 101 136 451 1,040
23 915 743 568 315 151 100 113 115 100 142 479 997
24 925 723 584 323 146 101 113 114 101 136 556 880
25 1,000 723 604 295 141 103 115 115 101 130 635 850
26 990 706 561 276 138 102 114 117 101 125 657 813
27 914 681 542 275 137 103 116 116 101 129 664 841
28 891 681 544 275 136 104 119 116 102 142 622 911
29 908 733 556 257 133 105 120 115 104 144 603 883
30 874   592 242 127 104 119 113 105 147 592 854
31 863   598   124   117 112   163   824