[4] In 1923, the dam was elevated from 51 to 117 feet (16 to 36 m), and was viewed by many as a step towards the re-vitalization of Baltimore after the Great Fire of 1904.

Additionally a 10-foot (3.0 m) steel pipe was built at a length of 1,623 feet (495 m) from the upper to the lower dam, which connected with the main tunnel running seven miles (11 km) to Lake Montebello in Baltimore.

A cold case involving the disappearance of Ohio business executive Wilbur C. French dating from November 29, 1977 was solved on July 16, 1984, when Baltimore County Police divers, who had been searching the 80 feet deep waters below the bridge for a stolen motorcycle, discovered a 1977 Chevrolet Monte Carlo lying on its side in the mud at the bottom.

On raising the vehicle out of the water, police found the remains of Mr. French, who had rented the car at Washington National Airport upon flying in for a business trip, behind the wheel.

Then the two men felt a burning sensation on their skin after the odd object left and were examined at a local hospital.

Officers of the Watershed Police of the Baltimore City Department of Public Works patrol the reservoir and its surroundings.