(AP) — Michigan Governor Rick Snyder is urging his Illinois counterpart to help pay for a project to keep invasive carp establishing themselves in the Great Lakes.

Snyder sent a letter Tuesday to fellow outgoing Republican Gov. Bruce Rauner, seeking support in fortifying a waterway. Snyder says Michigan would provide up to $8 million for upgrading the Brandon Road Lock and Dam near Joliet, Illinois.

Experts consider that a good location to block movement of Asian carp that have infested the Mississippi and Illinois rivers.

Several states bordering the lakes, including Michigan and Illinois, agreed previously to discuss cost-sharing. However, the U.S. Army Corps of Engineers recently said the project would cost $778 million — three times more than previously thought.

The Associated Press sent an email seeking comment from Rauner’s office.

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