This dataset contains the open access data and reports for the FIMP survey carried out in Whitetail Lake in 2020. Whitetail Lake is located in the East Kootenays, approximately 28 km northwest of Canal Flats, BC. The lake has a surface area of approximately 1.66 km2 with approximately 10 km of shoreline. The lake is moderately productive and has a large littoral area covering approximately 77% of its basin. There is a BC Recreation Site on the west side of the lake and all other properties around the lake are privately held. Whitetail Lake experiences significant recreational fishing pressure from anglers targeting trophy-sized Rainbow Trout (Oncorhynchus mykiss) and Eastern Brook Trout (Salvelinus fontinalis).