Bathymetry and selected perspective views of 6 reef and coastal areas in Northern Lake Michigan.

Dahlia Shoals
 

Figure 7.3- Oblique Perspective of Dahlia Shoal looking west . Two lobe like troughs at the left and shallow portion of the reef terminate eastward in rough relief and meter-high ridges similar to Boulder and Gull Island Reefs (Fig. 2 and 3). Sediment sand drapes the deeper slopes to the south and east, but less so to the west and south suggesting sediment transport from those directions. Distance across the bottom of perspective is about 3.9 km.