Nineteen months and one flood later, the Marion Conservation Commission is satisfied with updated plans to improve water control systems at Grassi Bog.

Purchased in 2002 by the Marion Open Space Acquisition Commission, the site is home to an abandoned cranberry bog open to the public. Through the years, the dams and spillways on the site have been prone to fail following heavy rains.

The commission’s plan when purchasing the property was three-fold: develop a trail network, create an emergent marsh habitat and maintain the bog’s vistas.

However, washed out berms and other problems have stymied commission members.

The system failed in spring of this year flooding portions of the bog, and in 2014 seven of eight structures holding back water were heavily damaged.

This August, an abutter sought relief from the Board of Selectmen saying flooded areas were encroaching on his property, and more standing water provided additional breeding for mosquitoes.

On Wednesday, open space commission member Jeff Oakes presented updated plans that included changes to spillways, the repair of a dike and the widening of a culvert.

The changes were in response to a memo Oakes’ board received from the Conservation Commission nineteen months ago regarding the damaged structures.

Conservation Commission Chair Norm Hills said he wanted to see a maintenance plan included to keep the system up to date.

He noted that one overflow ditch is blocked by fallen branches and the brush should be removed.

“I compared the 2013 plan with the 2015 plan trying to figure out what the differences were to avoid getting into a finger pointing contest,” Hills said.

In November, Conservation Commission members and open space Chair John Rockwell were at odds regarding the improvement plan.

At the time, town engineers submitted a report that found three areas of concern with the acquisition commission’s plan.

Rockwell contended the engineer’s findings were false.

While those issues have been addressed, Hills questioned figures related to spillways that appeared incorrect.

“The elevations of the spillways just bothers me,” he said. “I would think it would be the reverse order of the elevations listed here.”

Hopefully, the work will be finished this winter before spring showers bring rain, said Conservation Commission member Cynthia Trinidad

“I would like to see it get done,” she said. “They’ve been waiting a long time.

“We’ve all been waiting a long time,” Hills added.

Conservation Commission members then closed the public hearing regarding the amended plans.