Plum Creek Station was the crossroad of several trails and was the telegraph connection between Ft Bennett and Ft Meade as well as a watering hole along the Deadwood Trail. You can see trail ruts looking south just over the corner posts. My Father along with some other friends helped remap the Deadwood trail around 2006-08 with the signs left by Roy and Edith Norman helping point the way.
From the ODT series near here:
After gold was discovered in the Black Hills in 1874, there became a need to transport people and freight to the “Hills”. One of the shortest and easiest travel routes was overland from Fort Pierre, S.D., the nearest river landing, to Deadwood, the epicenter of gold mining. From 1874 to 1908, thousands of tons of freight and hundreds of people arrived in Fort Pierre by riverboat or railroad destined for Deadwood. From Fort Pierre the freight was loaded on wagons pulled by teams of draft animals, usually oxen. The people rode horses, in stagecoaches, in wagons, or walked. From Fort Pierre the wagon trains headed west along the 200 mile route known as the Fort Pierre to Deadwood Trail, which followed an old buffalo trail used by Indians and fur traders.
You are looking for a green bsb.