Coldwater Bridge has carried scattered reports since the rail line closed in the 1980s, mostly describing a rhythmic tapping audible near the center span at night. Our 2020 visit recorded the tapping on two of three nights, with a tempo that stayed consistent across both recordings — roughly 46 taps per minute.
A structural engineer consulted afterward suggested thermal contraction in the old rail ties as a plausible mundane cause, since metal contracting in cold temperatures can produce a similar periodic sound. We’ve archived the case on that basis, though the tempo consistency across nights with different temperatures wasn’t fully explained by that theory.