Dell Creek, c.15 mi/24 km long, Sauk co., S central Wis.; rises c.20 mi/32 km NW of Baraboo, flows SE, then NE, to Wisconsin R. near L. Delton town. Near its mouth, the stream widens to form L. Delton (2 mi/3.2 km long, 1/2 mi/4/5 km wide) and Mirror L. (2.5 mi/4 km long, c.1/4 mi/2/5 km wide), separated by a dam.