The Howard Landing Ferry is a cable ferry that operates between Ryde and Ryer Island, crossing Steamboat Slough in the Sacramento-San Joaquin River Delta in Solano County, California. The California Department of Transportation (Caltrans) operates the vehicle roll-on/roll-off service, which is classified as part of California State Route 220. The free ferry service operates 24 hours a day, 7 days a week. Boat operators are on duty 24 hours a day to provide service to individual passengers and motorists crossing Steamboat Slough.