Visual. Look for flows of around 400 cfs. The Satsop gauge near Satsop gives you some indication of what's happening in the basin. Flows of around 3000-4000 cfs are in the approximate range. The Middle Fork runs about 20% of the Satsop gauge, but flows on this upstream section are a bit less.
|SATSOP RIVER NEAR SATSOP, WA|
|usgs-12035000||2500 - 7000 cfs||IV-V||00h48m||266 cfs (too low)|