The following report is by Montana Angler:
The Ruby is a very option to fish during October. Visiting anglers really drop off in numbers and the river doesn’t see much pressure. Browns start to become less moody and the catch rates become a bit more predictable. Cloudy days can produce some dry fly action with Blue Winged Olive mayflies and small streamers can start to do some damage. Look for fish rising in the long, slow slacks that are very common as the Ruby River meanders along. These fish can be quite spooky so long casts and good drifts are key. The Ruby is a unique option as it is kind of like a tailwater and kind of like a freestone so come prepared in October to fish small flies, including tiny mayflies and even midges.
Upstream from Ruby Reservoir: Open
Downstream from Ruby Dam: Angling is closed the entire year just below Ruby Dam, from its confluence with Ruby Dam outlet channel upstream to the dam, including the outlet channel.
From Ruby Dam to Alder Bridge (Ruby Island FAS): Open through Sept. 30
From Alder Bridge (Ruby Island FAS) to the mouth: Open all year
The Month Ahead:
The Ruby will be a nice wade fishing option late into October. Streamers will be more and more effective as the fall progresses and some nice medium-sized browns can be taken.
Long Term Fishing Forecast:
The Ruby can be a good option in the winter months as long as the wind isn’t blowing too hard. It might not be worth a long drive but if you are in the area bring a rod along. Streamers can fish well very late into the fall and later in the winter it turns into a nymphing game. Dry fly action on midges will produce in the late winter.
