MEDIAN FLOW RATE · 30 DAY
1,210cfs 40.0% vs avg
Optimal band: 1,291–1,747 cfs
PERIOD HIGH
3,814cfs
PERIOD LOW
1,064cfs
RUNNABLE
27%
last 30 day in band
Precipitation History
Precipitation · YTD
DryDrier than normal
2026 to date
8.6in
-36% vs normal
8.56 in of precipitation so far this year, 36% below the 30-year normal of 13.41 in for this point in the season.
YTD Total
8.6in
This year so far
Normal to Date
13.4in
30-yr average
Typical Range
10.8–16.8in
10th–90th pct YTD
Departure
-36%
vs 30-yr normal
By Month
This year
Typical range
Normal
Jan: 0.15" · normal 1.00" (0.5–1.5)
Feb: 0.73" · normal 1.08" (0.5–1.9)
Mar: 1.86" · normal 1.61" (0.8–2.6)
Apr: 1.47" · normal 2.96" (2.0–4.0)
May: 3.02" · normal 3.87" (2.1–5.8)
Jun: 1.33" (so far)· normal 3.28" (2.0–5.2)
Jul: normal 1.32" (0.5–2.1)
Aug: normal 1.12" (0.3–2.2)
Sep: normal 1.76" (0.8–3.0)
Oct: normal 2.26" (1.2–3.4)
Nov: normal 1.31" (0.6–2.2)
Dec: normal 1.11" (0.4–2.0)
Baseline 1991–2020 · Source: Open-Meteo12:08 AM
Your History · Boulder River at Big Timber MT
Track your history
Sign in to track your sessions at Boulder River at Big Timber MT — best days, monthly trends, and time on the water.
Sign inSPONSORED
Weather Conditions
WEATHER CONDITIONS
TODAY
76°
48°
THU
77°
55°
FRI
84°
55°
SAT
78°
51°
SUN
71°
50°
MON
76°
48°
TUE
86°
47°
FISH INDEX
Temperature
Warm
Wind
Moderate
Pressure
Falling — Active
Moon Phase
Average
DAYLIGHT
SUNRISE
05:30 AM
SUNSET
09:14 PM
15H 44M OF DAYLIGHT21H 5M REMAINING
MOON PHASE
Waxing Gibbous
74% illuminated
Station Location
45.8338, -109.9387Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-06-25 00:09 UTC
Site #06200000·USGS
Create a free account to save favorites, set flow alerts, and track conditions