A cooperative in northeast Iowa hopes the addition of a new grain bin — perhaps the largest in Iowa — will allow the company to better serve its farmers.

Dunkerton Cooperative in Black Hawk County plans to have the company’s newest structure, a nearly 1.3-million-bushel capacity bin, completed in time for harvest this year. Dunkerton Cooperative’s General Manager Harlyn Vander Linden said the timing was right to pursue the project.

"Some of our storage is getting older, and it’s more...