It looks like rainbows are still biting in the reservoirs around Helena and worms and/or marshmallows are working for shore anglers.
See the Helena area reservoir fishing report for the week of October 15th, below, supplied by Adam Strainer and Troy Humphrey of Montana Fish, Wildlife and Parks in Helena:
Canyon Ferry: Anglers are trading in their rods for rifles this time of year, but a few folks are still out fishing. Rainbow trout continue to bite throughout the reservoir. Boat anglers are doing well in 5 to 20 feet with cranks (silver, red and green) or cowbells tipped with crawlers. Shoreline anglers are catching fish from Pond 4 to Goose Bay using worms and/or marshmallows. Walleye fishing has been decent. Trolling worm harnesses and cranks, from the south end ponds to mid reservoir (Beaver Creek Bay to Confederate Bay), has produced the best bite. Silver, copper or perch colored gear continues to works best. The yellow perch continue to be on the bite on the south end. Adam Strainer, FWP, Helena
Hauser: Rainbow fishing is good from both shore and boat. Shore anglers are catching rainbows at most access points including the Causeway Bridge, York Bridge, Black Sandy and Riverside. Using worms or marshmallows has been working best for shore anglers. Trolling cowbells or silver crankbaits around Black Sandy and Devil’s Elbow has produced good results for rainbows as well. Walleye and perch fishing are slow. Troy Humphrey, FWP, Helena
Holter: Rainbow fishing is very good while trolling cowbells or perch rapalas in the lower reservoir from the Oxbow to Holter Dam. Shore fishing for rainbows has been good as well around Departure Point and Black Beach while using worms. Walleye and Perch fishing are slow. Troy Humphrey, FWP, Helena