South Dakota Highway 377 (SD 377) is a state highway in Jackson County, South Dakota, United States. It begins at an intersection with SD 44 in Interior, and travels in a northeasterly direction to its northern terminus at the Interior Entrance Station for Badlands National Park. Route description SD 377 begins at an intersection with SD 44 in the northeastern part of Interior. It is a near-straight two-lane highway for its entire length. It ends at the Interior Entrance Station for Badlands National Park. Major intersections See also List of state highways in South Dakota References External links South Dakota Highways Page: Highways 201 + 377 Transportation in Jackson County, South Dakota