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"It's definitely a horrendous noise," Nemeyer said. "I have no idea what the noise is. [The resident] described to us that it was coming from the middle of the street. To me, it sounds like the sound of train tracks, that metal screeching sound, but there are no train tracks near her home ... so that's obviously ruled out."
Rick Vanderkin, the city's public works superintendent, told ABC News that very few people have heard the sound, making it difficult to locate and even more difficult to make an "educated guess as to what's creating the noise." So far, officials have ruled out a water valve, a gas leak and wildlife as possible culprits.