The Metropolitan Transportation Authority plans to close a river tunnel that carries the R train for more than a year to make repairs stemming from Hurricane Sandy, an agency official said.

The repairs, expected to begin in August, would close the Montague tube, which connects the R between Brooklyn and Manhattan, for 12 to 14 months, the official said Tuesday. The agency is expected to address the work at a board meeting on Wednesday.

The authority’s repair plans, which were reported Tuesday in The Wall Street Journal, also call for the G train tunnel to close for several weekends this year. It will be replaced by a shuttle bus between Brooklyn and Queens. Plans for options to the R tunnel were not immediately clear.

With the return of the A train in the Rockaways last week, the authority returned service to pre-storm levels for the first time. But transit officials have warned that the effects of the late-October hurricane will be felt for years. In May, Thomas F. Prendergast, the interim executive director, outlined storm-related damage across the system, including the corrosion of metal parts and the rupture of a pump discharge line in the L train’s Canarsie tube.