The Bay Model Visitor Center is a fully accessible education center administered by the U.S. Army Corps of Engineers which makes possible the viewing of a (retired) scientific tool: a working hydraulic model of the San Francisco Bay and Sacramento - San Joaquin River Delta System. The Model provides a unique opportunity to view the complete Bay-Delta system at a glance. Visitors are able to observe an average day's tidal pattern on the model in under 15 minutes!