This map shows modeled outdoor noise across Crossroads at 100-meter resolution, combining road, aviation, and rail sources. Green areas measure below 45 dBA. Orange and red exceed the EPA's 55 dBA outdoor threshold linked to long-term health effects. Use the layer toggles to view each source on its own or all together.
What the numbers sound like
- 30 dBAWhisper
- 40 dBASoft rainfall
- 45 dBAQuiet suburban street at night
- 50 dBAQuiet office
- 55 dBAEPA outdoor threshold: light traffic 100 ft away
- 60 dBANormal conversation an arm's length away
- 65 dBABusy restaurant
- 70 dBAHighway traffic 50 ft away
- 80 dBACity bus interior
Population Above the EPA Outdoor Threshold
The EPA's 55 dBA outdoor reference level is a common benchmark for residential noise exposure, especially for activity interference, annoyance, and long-term community noise concerns. About 2,981 Crossroads residents, or 44.9%, live above that level. By land area, 54.4% of Crossroads is above 55 dBA.
See how noise in Crossroads compares to similar-sized neighborhoods.
Noise by Part of Crossroads
Average noise levels for Crossroads residents, grouped by direction from the center of Crossroads. The highest population-weighted average is in northern Crossroads; the lowest is in eastern Crossroads, where just 25% of residents live in blocks above the EPA's 55 dBA threshold, about half the share in the loudest section.
Northern Crossroads
64% of people above 55 dBA
Northwestern Crossroads
64% of people above 55 dBA
Southwestern Crossroads
33% of people above 55 dBA
Southeastern Crossroads
26% of people above 55 dBA
Eastern Crossroads
25% of people above 55 dBA
To the human ear, noise in northern Crossroads sounds about 114% louder than in eastern Crossroads, a 11.0 dBA gap. Every 10 dBA roughly doubles perceived loudness. Within any of these directions, two homes a quarter mile apart can still differ by 10 or more dBA depending on how close they sit to a major highway.
How far back from Foothill Fwy do you need to be?
Foothill Fwy produces an estimated 75 dBA at its loudest centerline points. Noise drops logarithmically with distance, with the exact rate depending on what's between you and the road. Tree cover, walls, terrain, and pavement type all matter. At roughly a quarter mile back, traffic fades into the noise level of a soft rainfall.
Calculated from the model's calibrated attenuation formula. About 4% of Crossroads sits under tree canopy (much lighter than most neighborhoods) and roughly 50% is impervious surface like pavement and rooftops. Both are folded into the per-place decay rate above. Heavier canopy pulls noise down faster with distance; impervious surfaces slow the drop.