 Thirty-five miles of the Kalamazoo River were closed for clean-up until June 2012, when portions of the river were re-opened.On March 14, 2013, the Environmental Protection Agency (EPA) ordered Enbridge to return to dredge portions of the river to remove submerged oil and oil-contaminated sediment.The 2010 United States Census indicates Calhoun County had a 2010 population of 136,146.