Bank erosion pins (2-foot lengths of 0.38-inch steel rebar) were placed at 12 locations throughout the Caulks Creek study area in Wildwood, Missouri. Most of the bank erosion pins were located outside of the six study reaches, though one was located within study reach 4 and two were located within study reach 5. The bank erosion pin locations were largely determined by site access and the feasibility of inserting the pin into the bank face and are not intended to be a statistically representative sampling of the channel. The tip of the pin represents a datum from which a change in the bank position can be measured. The distance from the tip of the pin to the bank face was measured on the top, bottom, upstream side, and downstream side of the pin, and these measurements were averaged to obtain a final measurement value. The bank pins were measured six times between February 2022 and July 2023 including during installation and removal. The data are provided in comma-separated value (csv) format.