A 14-year-old girl was heroically saved by two police officers when they prevented her from jumping off the Brooklyn Bridge Wednesday night, sources said.

The teenager was on the middle span when she walked across a construction scaffolding beam toward the edge, according to law enforcement sources.

Officers Donnell Graves and Philip Hirsch of the 84th Precinct were able to grab her and bring her to safety.

She was taken to Bellevue Hospital Center for evaluation.