Lakers Store › Flathead Lake Key Chain Image 1 of 3 Image 2 of 3 Image 3 of 3 Flathead Lake Key Chain $3.50 Flathead Lake bathymetric map key chain. 1.16" x 2" with a stainless steel key ring Quantity: Add To Cart Added! Flathead Lake bathymetric map key chain. 1.16" x 2" with a stainless steel key ring