Monongahela River depth map (nautical chart)The marine chart shows water depth and hydrology on an interactive map. The sources of the Monongahela River is the Tygart Valley River and the West Fork River. The mouth of is the Ohio River at Pittsburgh, Pennsylvania. Average discharge: 12,650 cu ft/s (358 m3/s).
West Virginia, Pennsylvania
130 mi (210 km)
7,340 sq mi (19,000 km2)
Marion, Monongalia, Fayette, Washington, Allegheny, Westmoreland, Greene