Lake Byllesby is a 1,435 acre impoundment on the Cannon River created by a hydroelectric dam. A fisheries population assessment was conducted on Lake Byllesby in June, 2014. Assessment work consisted of standard lake survey netting using gill nets and trap nets. The last assessment netting on Lake Byllesby was completed in 2008. Previous years assessments were usually completed in mid-July. The assessment was moved to early June in 2014 to try to determine if fish numbers and catch rates were affected by seasonal migrations out of the reservoir and back into the Cannon River. Catch rates of most gamefish species were similar to past surveys.
High turbidity levels from runoff and excessive algal blooms limit submersed vegetation and likely impact the fishery. The reservoir is affected by excessive sediment loading in the upper reaches and much of the upper lake consists of shallow sand and mud flats at normal flow and lake levels. The fish community is similar to many reservoirs with a diverse fish population that includes many riverine species. Lake Byllesby can provide a fair fishery, especially in winter when many fish houses are present. Anglers typically target Black Crappie and Walleye. The reservoir may provide over-winter habitat for walleye and other species that move downstream from the Cannon River.
- Flowering Rush
Recreational activities such as recreational boating, angling, waterfowl hunting, and diving may spread aquatic invasive species. Some aquatic invasive species can attach to boats, while others can become tangled on propellers, anchor lines, or boat trailers. Many species can survive in bilge water, ballast tanks, and motors or may hide in dirt or sand that clings to nets, buckets, anchors, and waders. Fortunately, completing simple steps can prevent the transport of aquatic invasive species.