2.2.1 Topography and Drainage
The Langdon Lake subwatershed is located within the Lonsdale-Lerdal till region, and the topography is typical of that region – rolling and hilly with steep slopes abutting Black Lake and its associated wetland and abutting the shores of Saunders Lake.
The 2003 Hydrologic, Hydraulic and Pollutant Loading Study (HHPLS) subdivided the subwatershed into five subwatershed units, designated LL-1 through LL-5 (see Figure 2). LL-1 and LL-2 drain to Saunders Lake, a large wetland complex that is discharged through a small channel to Langdon Lake. Langdon Lake discharges through a culvert under Highway 110 into Lost Lake, which outlets into Cooks Bay. The subwatershed is bisected by a railroad corridor, (See Figure 1) which influences its hydrology.