Portal:Michigan/Did you know/4
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![Croton Dam](http://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Croton_dam_Brian.H_Flickr_102843790_9ae9b1a96d_o.jpg/100px-Croton_dam_Brian.H_Flickr_102843790_9ae9b1a96d_o.jpg)
- ...that Croton Dam (pictured), on Michigan's Muskegon River, was the first hydroelectric plant to transmit power at 110,000 volts or more?
- ... that the Air Zoo in Kalamazoo, Michigan houses the only SR-71B Blackbird in existence?