It runs all winter. It's low elevation which means cold doesn't affect level much. The big wood portage will become a bit dicey, if it's wet in there.

Brett is thinking CC Lewis - EF Lewis is mostly clear. Check the warnings.
Lewis drainage is primarily rain fed so it only gets better with fall / winter rains and runs as long as the rain falls.
As always on the EF Lewis, be respectful of private property and leave no trace. The property owners can be a little ....... twitchy?
Cheers

Tobin's right. My bad.

This river... as with most rain fed runs will run in the fall or winter any time there's enough rain... however, earlier in the season (now) flows tend to be more spiky. The river will rise really fast and drop really fast, so windows of opportunity are short. As we get into winter months flows become more stable and drop more slowly as the ground gets saturated and snow in the higher elevations both work to keep the water coming out more gradually. The key is keeping a close watch on those gauges and pay special attention to the rivers you want to run.... even when you're not looking to get on them: That way you can familiarize yourself with how a particular stream reacts to rain. This will enable you to better guesstimate if the rain on Thursday is going to mean good levels on Saturday or if it will be too high or low then. Hmm. didn't mean to give a whole lecture on the subject, but anyway. Yes EFL runs in the fall.