Source: US Geological Survey
Surface water in the prairie potholes is highly responsive to both air temperature and precipitation (Renton et al., 2105). In addition, a strong connection between groundwater and potholes is described as filling and subsequently spilling (Vanderhoof et al., 2016). When aquifers are full, surface water recedes slowly. Throughout the Dakotas, recent wet periods may be a part of natural variability that is likely to be repeated over longer time spans (Nustad et al., 2016; Ryberg et al., 2016; Liu and Schwartz, 2011).
Thirty-nine years of Annual NLCD land cover provide two good visual examples of prairie pothole flooding events: the Devils Lake area in northeastern North Dakota and Day County in northeastern South Dakota. Lakes, potholes and wetlands in those areas saw large increases in open water (Newsdakota.com, 2020). The James River, a tributary to the Missouri River that flows through Day County, also had recent flooding events (NASA, 2020).
Right: This map shows open water in North Dakota and South Dakota from 1985 to 2023. The colors indicate whether the open water areas gained or lost water, fluctuated between gains and losses or remained unchanged during that time period. Areas of special interest to this article are Devils Lake in North Dakota and Waubay Lake and Bitter Lake in South Dakota.
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