Lincoln County: North Platte. These sites are reached by leaving I-80 at exit 179, and going north on spur road L56G. Cross the South Platte River and turn east on a dead-end gravel road that will take you to the lagoons. These lagoons attract many water birds during migration. There are several wetlands to the north of North Platte (Whitehorse Marsh, Jackson Lake, and Ambler Lake) that support typical Sandhills marsh birds and waterfowl.