The 627-acre Nooksack unit extends from the Nooksack River estuary north to Slater Road, where it meets the Tennant Lake unit. It was purchased to protect critical salmonid and waterfowl habitat. Together with the Tennant Lake unit, it protects the eastern bank of the Nooksack River from its mouth to Ferndale, as well as most of Tennant and Silver creeks. A dike along the east bank currently protects previously farmed lowlands from flooding. The unit is being replanted with native riparian vegetation, and tidally influenced habitats are being restored for salmon and waterfowl. A dike-top trail runs along the Nooksack River. Approximately 100 acres of corn planted annually, with 10% of crop left standing in field over as winter waterfowl forage.