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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 -> 2025-09-30)

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
1 792 906 665 575 246 123 107 122 116 106 176 654
2 810 893 668 523 248 125 108 125 121 106 176 704
3 817 883 652 480 255 125 110 124 118 104 175 757
4 824 843 647 452 254 125 111 124 117 98 180 772
5 848 781 633 474 254 125 110 125 120 100 180 739
6 867 842 627 463 254 124 108 124 117 102 179 711
7 894 886 609 443 248 125 109 123 118 103 195 719
8 923 898 615 436 234 122 109 123 118 100 198 693
9 902 821 654 436 220 121 113 121 118 110 202 653
10 884 809 678 437 208 119 113 122 117 117 211 727
11 872 771 684 431 198 117 114 123 118 121 232 735
12 896 752 685 414 194 117 115 124 116 120 279 783
13 995 790 675 409 192 115 116 124 116 112 292 825
14 1,080 729 684 395 189 113 114 125 115 113 305 829
15 1,110 700 705 382 185 112 114 125 116 111 329 830
16 1,080 744 711 367 180 108 114 124 114 114 351 835
17 1,030 833 679 358 174 107 115 124 112 110 348 821
18 1,010 815 641 340 175 106 114 123 111 117 363 789
19 1,000 806 611 328 170 104 113 123 111 121 403 798
20 996 781 600 326 162 104 113 121 109 126 435 845
21 1,000 750 574 320 157 104 114 119 107 126 443 931
22 927 768 575 308 153 102 114 118 103 136 447 1,030
23 921 735 571 318 150 103 116 117 102 142 474 981
24 928 717 586 326 145 103 116 117 103 136 550 866
25 1,000 716 604 299 141 105 117 118 104 130 629 840
26 988 700 561 281 138 104 117 120 103 126 651 808
27 916 677 542 279 136 106 119 119 103 129 657 859
28 897 678 547 278 136 107 122 118 104 142 615 938
29 910 753 561 260 133 108 123 117 106 144 597 891
30 875   597 246 127 107 122 116 106 146 586 860
31 863   602   124   120 115   162   828