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USGS 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
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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 -> 2024-09-30)

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
1 795 900 656 575 246 123 106 120 114 105 175 654
2 813 888 660 523 247 125 107 123 119 106 176 704
3 819 879 646 481 252 124 108 123 116 103 175 757
4 826 839 642 452 250 125 109 123 116 97 181 772
5 850 778 629 475 249 125 109 123 118 99 181 739
6 868 842 623 464 249 124 107 122 115 101 180 711
7 893 888 605 444 244 125 107 122 116 102 195 707
8 923 902 611 438 232 123 107 121 115 99 198 686
9 900 826 650 438 219 121 111 120 116 110 202 649
10 878 814 674 440 207 119 111 120 116 116 211 721
11 867 776 680 434 197 116 113 122 116 121 232 724
12 893 758 680 417 193 116 114 122 115 119 279 778
13 995 796 670 412 192 115 115 122 115 111 292 824
14 1,080 734 681 398 189 113 113 123 114 112 305 830
15 1,110 702 703 385 185 112 113 124 114 110 329 833
16 1,080 746 709 370 180 108 112 123 113 113 351 839
17 1,030 837 677 361 174 107 113 122 111 110 348 826
18 1,010 818 639 343 175 105 112 122 110 117 363 794
19 1,000 809 610 330 170 104 111 121 110 121 403 803
20 994 784 599 329 163 104 112 120 108 126 435 851
21 997 753 573 322 157 103 112 118 106 126 443 938
22 919 771 574 311 153 100 113 117 102 136 447 1,030
23 912 737 570 321 150 101 115 116 101 142 474 987
24 921 717 586 329 145 102 115 116 102 136 550 871
25 997 717 606 301 141 104 116 117 102 131 629 844
26 983 700 563 283 139 103 116 119 102 126 651 811
27 907 677 544 281 137 104 117 118 102 129 657 861
28 884 677 547 280 136 105 121 117 103 141 615 941
29 901 733 559 262 133 107 121 116 105 144 597 894
30 867   596 247 127 105 120 114 105 147 586 863
31 855   602   124   119 113   162   831