The duct is a weird kind of place , meaning ya got ta put the time in and be in the right place at the right time. with the cold water you need to go slow on the retrieve and go small on the baits. No flows means be stealthy and fish the bends and throw up or down the line. If you hit it right its usually a good one. Most fish are between 6 and 7 lbs.
Good luck and always post a report and pic .