Becker Lake can only be fished with artificial flies and lures with a single point barbless hook, catch and release trout only. Big rainbow and tiger trout lurk along the weed beds on the south end, but can be found in the middle of the lake by boat and float tube as well. Flies to try are midges, Prince nymph, brown Montana stone and KP bugger. There is limited opportunity for shore fishing and wading especially due to low water, but there is a floating fishing pier that is handicapped accessible. Spin fishermen can try Z-rays, small Kastmasters or Panther Martins with the treble replaced with a single point barbless hook.

In early fall, fishing is best in the morning before the wind picks up and evenings after the monsoon storms have passed. In late fall when daytime temperatures are cool, all day can be very productive. A 2019 spring fish population found rainbow trout only 15 inches and greater. Illegally introduced largemouth bass can also be found in this lake and anglers are encouraged to harvest bass to help the trout populations.