Delvan Bay is a brackish bay within the Mobile-Tensaw Delta in Alabama, USA. It is a coastal feature connected to the Spanish River, Mobile River, and Tensaw River system, and it empties into Mobile Bay. The bay is picturesque and is one of the deeper bays in the delta, making it a destination during periods of low water. Access for paddlers is primarily via the Battleship Causeway (U.S. Highway 90), which crosses the lower delta. There are free public boat ramps along the causeway, including a site known as the River Docs launch, which is a red clay launch point 1.5 miles east of the Exxon ramps on the north side of the causeway and just northwest of Ed’s Seafood Shed. Another common put-in is the Causeway Public Boat Ramps. The bay is part of a complex network of waterways suitable for extended paddling trips. A typical route could involve launching at the causeway, crossing the Tensaw River into Delvan Bay, proceeding into the Spanish River, and then into the Mobile River, creating a loop of approximately 22.5 miles taking about eight hours at a leisurely pace. Shorter trips of around 15 miles are also possible, incorporating Delvan Bay with Chocalata Bay, Conway Creek, and Little Bateau. The area is characterized by extensive floating grasses and shallow marshes, which can impede pedal-driven kayaks. Wildlife sightings include alligators, snakes, and dense populations of dragonflies. The surrounding delta is remote and swampy, with historical significance related to the Revolutionary War and the region's early colonial history. Waterfowl hunting is a common activity in the bay and surrounding marshes, and paddlers should be aware of other users during hunting seasons. One notable hazard is a persistent log jam in the nearby Pumphouse Canal, which can block passage. Tidal and current conditions in the area are generally reported as minimal for paddling trips.