2.2.2 Geology and Soils
The depth to bedrock within the subwatershed varies from 150 to 250 feet. Quaternary deposits – the surficial material overlaying the bedrock – are high relief New Ulm loamy till, with pockets of peaty muck. A deposit of ice-stratified sand and gravel extends southwest of Langdon Lake.
Soils within the watershed are predominantly well-drained Natural Resources Conservation Service Hydrologic Soil Group B (loamy soils with moderate infiltration potential), with pockets of poorly-drained soils of varying infiltration potential (see Figure 3). Group D (clayey soils with very low infiltration potential) soils are found in low-lying areas and are generally hydric, or showing indications of inundation (see Figure 4).