MEDIAN FLOW RATE · 1 DAY
209cfs 31.0% vs avg
Optimal band: 190–256 cfs
PERIOD HIGH
240cfs
PERIOD LOW
209cfs
RUNNABLE
100%
last 1 day in band
Gauge Height
3.74ft
Weather Map
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Your History · St. Mary R nr Int'l Boundary, MT
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Station Location
49.0119, -113.2992Loading map…
DATA · USGS · NOAA · NWSUPDATED 2026-09-01 12:10 UTC
Site #05020500·USGS
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