US Army Corps of Engineers
Rock Island District Website

Exposed Zebra Mussels
It has been 35 years since the T.J. O'Brien Lock was last dewatered. During that time, invasive species like zebra mussels have had plenty of time to cover nearly every surface of the sector gates.

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Photo by: Samantha Heilig |  VIRIN: 141211-A-VX113-003.JPG