![Oregon, Illinois, USA. A dam in the Rock River in downtown Oregon, Illinois. The Rock River is a tributary of the Mississippi River Stock Photo - Alamy Oregon, Illinois, USA. A dam in the Rock River in downtown Oregon, Illinois. The Rock River is a tributary of the Mississippi River Stock Photo - Alamy](https://c8.alamy.com/comp/2CWDDR7/oregon-illinois-usa-a-dam-in-the-rock-river-in-downtown-oregon-illinois-the-rock-river-is-a-tributary-of-the-mississippi-river-2CWDDR7.jpg)
Oregon, Illinois, USA. A dam in the Rock River in downtown Oregon, Illinois. The Rock River is a tributary of the Mississippi River Stock Photo - Alamy
Rock Island District > Missions > Recreation > Mississippi River Project > Recreation > Lock & Dam 21
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