Course
The river rises in the High Plains of Wyoming, in southern Niobrara County. The Niobrara flows east as an intermittent stream past Lusk and southeast into northwestern Nebraska. It then flows southeast across the Pine Ridge country of Sioux County, then east through Agate Fossil Beds National Monument, past Marsland, and through Box Butte Reservoir. The stream flows east across northern Nebraska, near the northern edge of the Sandhills and past Valentine. It is joined by the Snake River about 13 miles (21 km) southwest of Valentine. In north-central Nebraska it is joined by the Keya Paha River approximately 6 miles (10 km) west of Butte. The river joins the Missouri northwest of Niobrara in northern Knox County. Its total drainage basin is about 11,580 square miles (30,000 km2).
76 miles (122 km) of the Niobrara River in central Nebraska from the town of Valentine east to Nebraska State Highway 137, have been designated as the Niobrara National Scenic River.
Read more about this topic: Niobrara River