announced to build a second (and larger) lake. By January 1929, the preserve covered about . Funds from the sale of hunting and fishing licenses were used to acquire the additional land. State Park In 1927, the Indiana state legislature passed a law allowing county commissioners to acquire land for the purpose of establishing a state park, and donate the land to the state conservation department. Brown County State Park was the fourth such park established after this legislation. In 1929, Brown County commissioners gave the state conservation department of land adjacent to the Brown County Game Preserve for the creation of a state park. Four parks had been donated using other means before the legislation, making Brown County State Park Indiana's eighth state park. In 1933, eleven Civilian Conservation Corps groups were established for Indiana's state forests, game preserves, and state parks. Each group had 200 workers involved in the construction of buildings, bridges, trails, roads, and water supplies. One project was a large shelter in the Brown County game preserve. After training, workers from the Corps arrived in Brown County in 1934. The Corps began constructing much of the park's extant infrastructure. They worked to prevent erosion by reforesting with walnut, pine, and spruce trees. A second camp for the Civilian Conservation Corps opened in the park in 1938. The CCC Trail—the park's Trail 2—is one built by the Corps. The park was listed on the National Register of Historic Places in 2020 for its CCC elements. Beginning in 1941, the Brown County Game Preserve and Brown County State Park were unified as a single state park. Since that time, two portions of the park have been designated as nature preserves—giving them additional protection from development. Ogle Hollow Nature Preserve was established in 1970 and consists of in Ogle Hollow containing the rare yellowwood tree. The second preserve is the Ten O'Clock Line Nature Preserve. This preserve was designated in 2010, and is Indiana's largest. It also contains yellowwood trees, and is the home of some of Indiana's deep forest species, including the red bat, timber rattlesnake, and broad-winged hawk. The term "Ten O'Clock Line" refers to a treaty with the Miami Indians from the early 1800s. The 1987 Pan American Games, hosted in Indianapolis (roughly north), utilized Brown County State Park as the venue for the road race cycling competition. Kin Hubbard Frank McKinney "Kin" Hubbard (1868