Brighton Dam on the border between Howard and Montgomery counties is undergoing a $13 million rehabilitation project that will limit traffic on the dam roadway and close the popular Triadelphia Reservoir to recreational use for the next two years.

Officials with the Washington Suburban Sanitary Commission, which operates the dam, said there’s nothing structurally wrong with the 74-year-old facility in Brookeville, but maintenance is needed.

The project, which began this past week and will continue until summer 2019, involves rehabilitating 13 gates that control water flow, resurfacing the concrete spillway, and replacing original intake gates and screens.

Carla A. Reid, general manager and CEO of the agency that supplies water to 1.8 million customers in Montgomery and Prince George’s counties, said in a news release the dam “is safe, and this project will ensure it stays that way.”

The project is being funded through WSSC ratepayers, and includes construction of a new, larger visitors center, which will also serve as a watershed field office.