| Species | Rating | Size | Baits, Method, and Location | ||||||||||||||||||||||||
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| Auxiliary Lake is closed to fishing during the waterfowl hunting season and will reopen in March | |||||||||||||||||||||||||||
| Black Bass | Up to 5 pounds | The lake has a fairly good smallmouth bass population. Best place is the dam but they can be found in any rocky areas. The largemouth bass population underperforms at this lake and currently is providing only a mediocre fishery. Best spots are around the island and the East bank. | |||||||||||||||||||||||||
| Crappie | Most 10-12" | Crappie numbers are never high at this lake and they are currently below normal. West side of the island is one of the better spots to find them. | |||||||||||||||||||||||||
| Catfish | Varies | The lake supports a pretty good channel catfish population which is maintained with regular stockings of 8"-10" fish. Numbers of channel catfish have been fairly steady for the last decade, however bigger fish have been less common the last few years. Along the West bank seems to be the most consistent spot for channel catfish. The lake also supports a low-level blue catfish and flathead catfish populations. | |||||||||||||||||||||||||
| Walleye and Sauger | Up to 6 pounds | The lake has maintained a modest walleye population with fairly good harvest rates through the years. The most recent fish sampling shows adult walleye numbers are low but there was good survival from the 2025 stocking. Sauger have done very well at the lake since they were introduced in 2021. Sauger is the smaller cousin of walleye but they have been able to grow to 15 inches in two years at this lake. The 2025 fall sample showed that 20% of the current population was over 15 inches long. Walleye and sauger can be caught using similar methods. The two species are combined in KS regulations and an angler can harvest a combined total of 2 per day at the Jeffrey Lakes that are over the 15-inch minimum length limit. | |||||||||||||||||||||||||
| White Bass | Most below 12" | The current population is well below normal with few fish available right now. | |||||||||||||||||||||||||
| Wiper | Up to 8 pounds | Wiper numbers are above average and is dominated by the 2022 year-class with 74% of the fish collected fall of 2025 were over 17 inches long. There are also good numbers of bigger fish with 29% over 20 inches. | |||||||||||||||||||||||||
| General Comments | |||||||||||||||||||||||||||
| Anglers need to check into the Jeffrey Energy Center Guard House located north of St. Mary's, then west off K-63 Hwy. You can call the Guard House to check on availability at (785) 456-6149. The Jeffrey Energy Center allows 30 anglers to fish at any one time. Auxiliary Lake has zebra mussels which classifies the lake as an Aquatic Invasive Species water. Fish may not be transported alive from AIS designated waters. To help prevent the spread of invasive species, please CLEAN, DRAIN & DRY all equipment when changing water bodies and dump your bait.
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