MEDIAN FLOW RATE · 1 YEAR
12cfs 14.0% vs avg
Optimal band: 5–7 cfs
PERIOD HIGH
30cfs
PERIOD LOW
3cfs
RUNNABLE
58%
last 1 year in band
Precipitation History
Precipitation · YTD
DryDrier than normal
2026 to date
11.3in
-17% vs normal
11.26 in of precipitation so far this year, 17% below the 30-year normal of 13.58 in for this point in the season.
YTD Total
11.3in
This year so far
Normal to Date
13.6in
30-yr average
Typical Range
11.6–16.3in
10th–90th pct YTD
Departure
-17%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 0.45" · normal 1.03" (0.6–1.5)
Feb: 1.29" · normal 1.10" (0.3–1.9)
Mar: 2.78" · normal 1.65" (0.9–2.3)
Apr: 1.83" · normal 2.47" (1.6–3.3)
May: 2.34" · normal 3.13" (2.0–4.3)
Jun: 2.23" · normal 3.64" (1.9–5.2)
Jul: 0.33" (so far)· normal 1.74" (0.5–3.3)
Aug: normal 1.39" (0.5–2.3)
Sep: normal 1.59" (0.5–2.7)
Oct: normal 1.57" (0.7–2.3)
Nov: normal 1.46" (0.7–2.4)
Dec: normal 1.26" (0.6–2.1)
Baseline 1991–2020 · Source: Open-Meteo03:46 PM
Your History · Willow Creek at Opportunity, MT
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Weather Conditions
WEATHER CONDITIONS
TODAY
81°
53°
FRI
89°
56°
SAT
92°
60°
SUN
97°
59°
MON
96°
61°
TUE
93°
59°
WED
88°
60°
FISH INDEX
Temperature
Warm
Wind
Calm
Pressure
Stable
Moon Phase
Average
DAYLIGHT
SUNRISE
05:49 AM
SUNSET
09:23 PM
15H 34M OF DAYLIGHT
MOON PHASE
Waning Crescent
26% illuminated
Station Location
46.1072, -112.8106Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-07-09 00:00 UTC
Site #12323720·USGS
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