USGS · 452314122450400

TUALATIN RIVER

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TUALATIN RIVER AT I-5, NEAR DURHAM, OR

TUALATIN, OR45.3873°N, -122.7511°W

AIR TEMP

62°F

WIND

5mph N

FISH INDEX

81SCORE / 100

GREAT · 4 OF 5

1D 7D 30D 1YR

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 YEAR

—cfs

No flow data available

Precipitation History

Precipitation · YTD

Normal

Near-normal year

2026 to date

22.9in

≈ normal

22.93 in of precipitation so far this year — about average for this point in the season (normal 26.56 in).

YTD Total

22.9in

This year so far

Normal to Date

26.6in

30-yr average

Typical Range

19.1–35.0in

10th–90th pct YTD

Departure

-14%

vs 30-yr normal

By Month

This year

Typical range

Normal

Jan: 3.41" · normal 6.56" (3.4–9.5)

Jan

Feb: 6.95" · normal 5.10" (2.7–7.8)

Feb

Mar: 5.46" · normal 5.66" (3.2–8.8)

Mar

Apr: 3.72" · normal 4.50" (2.5–6.4)

Apr

May: 1.23" · normal 2.83" (0.9–4.6)

May

Jun: 2.16" · normal 1.77" (1.0–3.0)

Jun

Jul: 0.01" (so far)· normal 0.50" (0.1–1.0)

Jul

Aug: normal 0.60" (0.1–1.1)

Aug

Sep: normal 1.77" (0.1–3.6)

Sep

Oct: normal 4.17" (1.6–6.7)

Oct

Nov: normal 6.84" (3.1–10.3)

Nov

Dec: normal 7.56" (4.2–10.5)

Dec

Baseline 1991–2020 · Source: Open-Meteo01:35 PM

Your History · TUALATIN RIVER AT I-5, NEAR DURHAM, OR

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Station Location

45.3873, -122.7511

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