Ever Wonder Series: Why did the distance of Fenway Park's Green Monster change?

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Of all of Fenway Park's quirks, my favorite might be how the 315-foot sign on the Green Monster suddenly became 310.

It's possible I love this story because the sportswriter gets to be the hero.

In 1995, the Globe's Dan Shaughnessy decided to settle one of the most persistent rumors of his career. He remembers hearing it as a cub reporter during the 1975 World Series, when the Reds insisted to a man that Fenway's famed left field fence couldn't possibly be 315 down the line.

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They all believed it was closer, but no one could prove it, because the Red Sox resisted periodic efforts to measure and answer the question once and for all.

That didn't stop the Globe from accessing the park's original 1912 blueprints, which showed the wall at 308 feet. They enlisted a World War II reconnaissance pilot to examine aerial photos, and he pegged it at 304. The author George Sullivan crawled up the foul line with a yardstick and settled on 309-5.

None of those numbers ever became official, though, because 315 by that point had been well-established as part of the park's lore. Fenway opened in 1912, was extensively renovated in 1934, and added bullpens in 1940, giving us the dimensions we essentially recognize today. For more than 60 years, the 315 sign at the base of the foul pole beckoned right-handed sluggers, terrified pitchers, and lived in what felt like perfect accuracy.

But Shaughnessy had other ideas. He finally decided to take matters into his own hands in March of 1995. His friends on the grounds crew looked the other way as he hopped a fence in an empty Fenway and unfurled a 100-foot Stanley SteelMaster tape measure.

It only took a matter of minutes to prove his hunch correct: 315 wasn't 315 at all.

It was 310, or 309-3, to be precise. Shaughnessy wrote about his findings in late April, and within a month, the Red Sox had quietly changed the sign to 310, which it remains to this day.

"My whole life looking at that wall, it was 315," Shaughnessy said. "Shortly after the story appeared, they changed it to 310, which surprised me. It was very un-Red Sox like in those days, and these days.

"Now when I see 310, I take some pride in that."

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