Sign at edge of Hartsville, WY. Hartsville is built in a gully with a dry stream running thru town. One of the building, a fire station or city building, if I remember correctly spans the dry stream and run off can go under building and down the country. This town was probably a mining town in the beginning and many of them were built in gullys or small valleys near mining operations. The sites were not picked for ease in building but was close in proximity to mines.