Marion, SD Noise Levels
Marion, SD: what the federal noise map shows
Marion, SD reads 57.5 dB(A) on BTS's 24-hour average, inside HUD's "Acceptable" noise zone, 65 dB(A) day-night average or below under 24 CFR 51.104, the federal government's own line for building housing with no extra sound attenuation required. Road traffic drives that number here, not the other two sources. Marion's reading comes from a single sampled point, not a block-by-block sweep, so a specific address here could genuinely differ.
Marion's noise, by source
Each of the three transportation modes gets its own model from BTS; the combined figure above is what they add up to.
What this means for a house here
Upgraded windows, door seals and STC-rated glazing meaningfully cut broadband, near-continuous road noise.
Where Marion ranks
Among the 3,622 US places in this dataset with any measurable transportation noise, Marion ranks 732, loudest first. Population is about 880, 10,826th largest of the 12,137 places covered here.
Your street may differ from Marion's reading
For a single house or lot in Marion 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 Marion's figure, see the methodology guide. Since road traffic is what's driving this reading, the guide to what actually cuts each kind of noise covers the fix that fits.