Castle Shannon, PA Noise Levels
Castle Shannon, PA: what the federal noise map shows
Castle Shannon, PA 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. Rail traffic drives that number here, not the other two sources. This describes Castle Shannon as a whole, not a specific block, the underlying BTS map resolves to about 38 meters per pixel, sampled at the town's own center point.
Castle Shannon'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
The same window and door upgrades that work on road noise also cut broadband rail noise, though very low-frequency freight rumble travels through walls, not just glass.
Where Castle Shannon ranks
Among the 3,622 US places in this dataset with any measurable transportation noise, Castle Shannon ranks 466, loudest first. Population is about 8,094, 3,708th largest of the 12,137 places covered here.
Your street may differ from Castle Shannon's reading
For a single house or lot in Castle Shannon 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 Castle Shannon's figure, see the methodology guide. Since rail traffic is what's driving this reading, the guide to what actually cuts each kind of noise covers the fix that fits.