According to the Fish Passage Strategy adopted by the Executive Council in January of 1989 the jurisdictions of the Chesapeake Bay watershed will 'provide for fish passage at dams, and remove stream blockages whenever necessary to restore natural passage for migratory fish.' 2,526 blockages to the historic spawning areas of migratory fish have been recognized. Because of the large number of blockages, a subgoal of opening fish passage to migratory fish on the major tributaries has been developed. If these blockages were removed, 1356.75 miles of spawning area would become available to migratory fish, restoring critical mainstem habitat.