Hydrologic bench mark sign, 1969Great Smoky Mountains National ParkHydrologic Bench-mark Streamflow Station operated by the U.S. department of the Interior Geological Survey. The Area drained by Little River above this point (106 square miles) lies wholly within the Great Smoky Mountains National Park. The streamflow and other hydrologic data collected here will make possible the assessment of natural hydrologic changes and trends, uninfluenced significantly by actions of man.Hydrologic Bench Mark Sign, II-A-Sign-15325, Physical Facilities - Minor Structures - Signs