For those looking to use multiple flies, a multi-nymph rig is a great option. This rig can be used to catch walleye, bass, trout, and many other types of fish.
This type of rig works best in areas with standardized currents. When the current varies too much, the flies can interfere with each other, making them ineffective. One of the flies may drag in a way that yanks on the other fly, which can make look unnatural. When fishing in areas with multiple currents, it’s best to opt for a single fly rig.