Underwood, IA Noise Levels
Underwood, IA: what the federal noise map shows
At Underwood, IA, road, rail and aircraft noise all fall below the 45 dB(A) floor BTS's national map can distinguish from silence. Underwood's reading comes from a single sampled point, not a block-by-block sweep, so a specific address here could genuinely differ.
Where Underwood ranks
Underwood, IA sits among 8,515 US places this dataset covers with no measurable transportation noise, out of 12,137 places checked overall. About 973 people live there, making it the 10,375th largest place in this dataset.
Your street may differ from Underwood's reading
For a single house or lot in Underwood rather than the town-wide figure above, BTS's own map is the same free source, queried directly.
More on how this number was built
For exactly which federal dataset feeds Underwood's figure, see the methodology guide. The guide to reading a quiet result explains what "no measurable noise" actually means at Underwood.