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Lino Lakes Local Water Management Plan 10 November 2018 – WSB Project No. 02988-500 2.2 Topography, Soils and Geology Topography The topography of Lino Lakes is generally rolling, with the highest ground in the southeast corner of the city and the lowest around Baldwin Lake. The majority of Lino Lakes is dominated by the Rice Creek Chain of Lakes, interspersed with lakes, wetlands, streams, and various judicial and county ditches. Soils Soils in Lino Lakes consist of Zimmerman fine sands, Rifle muck, and Isanti soil complexes (Soil Survey Staff 2017). In the northwest, the soils are predominately well-draining, on top of the Anoka Sand Plan, while on the southeast, the soils are poorly draining and result in a higher runoff potential compared to the northwest. The hydrologic soils group, a measure of the infiltration and runoff potential of the surface soils, is provided in Figure 2-1. Geology The surficial geology of eastern Lino Lakes is primarily glacial ice deposits of loamy tills with peat and muck around the Chain of Lakes and in isolated pockets (Figure 2-2). The loamy till is from the New Ulm formation and is chiefly loam texture with unsorted sediment. Peat and muck was deposited in the quaternary era and is composed of partially decomposed organic matter deposited in marshes. Peat and muck also includes fine grained organic matter laid down in ponded water and marl (Setterholm 2013). The western area of Lino Lakes is primarily lake deposits from the Late Wisconsin Pleistocene (Meyer 1993). Bedrock geology consists of sandstones (Figure 2-3). St. Peter Sandstone and the Prairie du Chien Group from the Ordovician and Lower Ordovician periods comprise the southeast corner of Lino Lakes. The northwest corner is made up of the Jordan Sandstone, the Tunnel City Group, and St. Lawrence Formation. Buried stream channels that are incised into several rock formations are a primary influence on the distribution of bedrock geologic units, including under the Rice Creek Chain of Lakes (Berg, 2016).