MEDIAN FLOW RATE · 1 YEAR
42cfs 18.9% vs avg
Optimal band: 39–53 cfs
PERIOD HIGH
2,463cfs
PERIOD LOW
19cfs
RUNNABLE
24%
last 1 year in band
Precipitation History
Precipitation · YTD
NormalNear-normal year
2026 to date
18.8in
≈ normal
18.82 in of precipitation so far this year — about average for this point in the season (normal 19.24 in).
YTD Total
18.8in
This year so far
Normal to Date
19.2in
30-yr average
Typical Range
13.1–24.6in
10th–90th pct YTD
Departure
-2%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 1.78" · normal 4.05" (2.2–5.7)
Feb: 4.24" · normal 3.44" (1.5–6.5)
Mar: 5.49" · normal 3.78" (2.0–6.2)
Apr: 4.64" · normal 3.21" (1.7–4.7)
May: 1.17" · normal 2.87" (1.3–5.4)
Jun: 1.50" · normal 1.85" (0.9–2.7)
Jul: 0.00" (so far)· normal 0.57" (0.1–1.7)
Aug: normal 0.66" (0.1–1.4)
Sep: normal 1.15" (0.1–2.2)
Oct: normal 2.84" (1.2–4.3)
Nov: normal 4.27" (2.2–6.7)
Dec: normal 4.55" (2.8–6.0)
Baseline 1991–2020 · Source: Open-Meteo07:09 PM
Your History · MILL CREEK NEAR WALLA WALLA, WA
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Weather Conditions
WEATHER CONDITIONS
TODAY
75°
49°
FRI
81°
58°
SAT
87°
60°
SUN
85°
62°
MON
87°
65°
TUE
90°
67°
WED
80°
57°
FISH INDEX
Temperature
Warm
Wind
Light
Pressure
Stable
Moon Phase
Average
DAYLIGHT
SUNRISE
05:06 AM
SUNSET
08:46 PM
15H 40M OF DAYLIGHT0H 0M REMAINING
MOON PHASE
Waning Gibbous
91% illuminated
Station Location
46.0079, -118.1186Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-02 21:39 UTC
Site #14013000·USGS
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