Actually it wasn't quite a mile long: this original wooden bridge measured 4,740 feet (1,440 metres) in length and was 30 feet (9.1 m) in width. It was supported by 3,865 wooden piles driven deep into the bottom of the river.
"As the end of the era of trolley cars rolled in, automobiles took over and the wooden bridge was not effective anymore. Lovell sold the bridge to the Eastern Massachusetts Street Railway. By 1930, the structure began to show the strain of the years of shifting sands, ice floes and heavy traffic. New Hampshire was faced with making plans for a modernized structure to replace the wooden bridge. The current bridge opened in 1949." (wikipedia)
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