W9 Water Quality, also known as Okabena-Bella, is a local government-owned structure in Zumbro Falls, Minnesota, designed by HDR ENG. This dam on Okabena Creek serves the primary purpose of flood risk reduction and was completed in 2001. With a height of 20 feet and a length of 265 feet, it has a storage capacity of 700 acre-feet and a normal storage level of 92 acre-feet.

This low hazard potential dam with a satisfactory condition assessment underwent its last inspection in November 2018, with a frequency of every 8 years. The spillway type is uncontrolled with a width of 25 feet, and it is equipped with uncontrolled outlet gates. The risk assessment for W9 Water Quality is considered moderate, with a DSAC (Dam Safety Action Classification) yet to be assigned. Despite its relatively low hazard potential, the dam plays a crucial role in mitigating flood risks in the area, highlighting its importance for water resource and climate enthusiasts.