This post is an educational tool for those unfamiliar with the flood plain of Marietta, OH.  Currently, there is a FLOOD WATCH for the Marietta area, with projections of river levels reaching Action Stage by the 16th.  Watch Writing on the Mall for projection updates as they are posted by the National Weather Service.

So you may be wondering what River Gauge is.  It’s the measurement taken at select sites up and down rivers across the country to help better map river levels.  There are two gauge sites near Marietta: one at the confluence of the Ohio and Muskingum Rivers on the Harmar side of the Muskingum, and one at the Willow Island Lock just upriver.

These gauge readings can tell us how close we are to flood stage at certain points.  At Marietta, as you can see on the image above, we start getting worried around the 33 foot mark, which is labeled an Action Stage.  Between 33 and 35 feet, the river threatens to overflow at its lowest points.  Action Stage also serves as a way to alert the community that the floodwaters could raise at any point.

Floodwaters between 35 and 38 feet are considered Flood Stage at Marietta.  Flooding first hits Don Drumm Stadium, as it is one of the lowest areas in town.  It takes 37 feet to affect Fourth Street housing.

Moderate Stage is when flood waters are between 38 and 40 feet.  At this stage, most of the West Virginia area along the river is flooded.  Flooding could affect the Hermann Bowl and areas along the creek.

When you get above 40 feet, you enter the Major Flood Stage, which is where seven of the ten largest floods in Marietta history have peaked.  At 40 feet, a majority of Marietta is flooded, along with Harmar and low-lying areas of Williamstown.  The largest flood in Marietta history topped out at over 58 feet.  You can still see markers on first street to commemorate the largest floods, with more recent markers showing where the 2004 flood was.  The September 2004 flood was nearly 45 feet, while the January 2005 flood was around 44 feet.