What it takes to operate Miller Park.
One of six major league baseball stadiums with some form of retractable roof, Miller Park is the only place with a diamond-shaped dome that retracts neatly to reveal the grassy field underneath; all the others involve boring square-shaped configurations. Opening the roof at Miller Park happens slowly, using forces of Sisyphean determination, as a squadron of 10 electric motors called “bogeys” slowly part the roof using 60 horsepower engines, about the oomph of a medium- sized motorcycle. The decision to open or close the roof due to inclement weather rests solely with the Brewers themselves.
Fun Facts About Miller Park’s Retractable Roof
- Each panel is moved by two tractor-like engines (aka “bogeys”) at a speed of half a miler an hour.
- The tallest arch extends 30 stories in the air.
- Inside the stadium, the ceiling rises some 200 feet above second base.
- Even though the roof covers more than 10.5 acres and is made of 12,000 tons of steel, it takes only about 10 minutes to completely open or close.
- Seven interlocking panels stretch some 600 feet, from a position high above home plate to a beam over the outfield. Each of the three largest covers approximately the same surface area as the Bradley Center’s roof.
- The Bogeys move around a semi-circular track little trains.
- While the stadium’s lid remains closed during the off-season, natural grass can still grow thanks to these stories-high windows.