The Yolo Causeway is a 3.2-mile (5.2-kilometer) long elevated highway viaduct on Interstate 80 that crosses the Yolo Bypass floodplain and connects the cities of Sacramento, California and Davis, California (through West Sacramento, California).

The 25,500 acre (103 km²) Yolo Bypass protects Sacramento and other California Central Valley communities from flooding. During wet seasons, it can be completely full of water.

The ground below the causeway is what makes this area most unique. The causeway crosses an approximate 16,000-acre area known as the Yolo Bypass Wildlife Area which is a model of a public-private partnership that shows that wildlife, flood control and agriculture can co-exist in a largely urban setting. The Yolo Basin Foundation provides monthly tours of the Wildlife Area and frequent trips during the summer months to view the evening fly out of bats.

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