This map shows modeled outdoor noise across McCullough Hills 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 6,116 McCullough Hills residents, or 40.2%, live above that level. By land area, 47.3% of McCullough Hills is above 55 dBA.
See how noise in McCullough Hills compares to similar-sized neighborhoods.
Noise by Part of McCullough Hills
Average noise levels for McCullough Hills residents, grouped by direction from the center of McCullough Hills. Northern McCullough Hills carries the highest population-weighted average; Southern McCullough Hills carries the lowest. Just 23% of residents in Southern McCullough Hills live in blocks above the EPA's 55 dBA threshold, about half the share in Northern McCullough Hills.
Central McCullough Hills
43% of people above 55 dBA
Eastern McCullough Hills
28% of people above 55 dBA
Northern McCullough Hills
60% of people above 55 dBA
Southern McCullough Hills
23% of people above 55 dBA
Western McCullough Hills
40% of people above 55 dBA
Northern McCullough Hills sounds about 67% louder than Southern McCullough Hills to the human ear, a 7.4 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.
Loudest Road Corridors
The model evaluates every road in McCullough Hills using federal traffic counts, posted speeds, heavy-truck ratios, and pavement type. The source level shown is the modeled noise at the road centerline, where it is loudest. Noise drops with distance, faster in vegetated areas and slower over open pavement.
How far back from Ir215s do you need to be?
Ir215s produces an estimated 71 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 1% of McCullough Hills sits under tree canopy (much lighter than most neighborhoods) and roughly 60% 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.
Airport Noise
Harry Reid International (LAS) sits northwest of McCullough Hills. The U.S. Department of Transportation measures aviation noise around this airport directly, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 75 dBA on the map's Overall layer. Blocks on the opposite side of McCullough Hills, particularly to the southeast, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across McCullough Hills
The bar chart below shows the share of McCullough Hills residents in each noise band. About 67% of residents live below the EPA's 55 dBA threshold, and roughly 13% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How McCullough Hills Compares
McCullough Hills sits at the louder end of the spectrum. Below: how McCullough Hills's average outdoor noise and share of residents above the EPA threshold compare with Macdonald Ranch, Green Valley Ranch, Gibson Springs, and Pittman.
Average noise level (dBA)
McCullough Hills's 54.4 dBA pop-weighted average is at the louder end of the spectrum. Nevada as a whole averages 53.6 dBA and the U.S. averages 52.0 dBA. Both are lower than McCullough Hills because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 40.2% of McCullough Hills residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's in the middle of its peer group. Measured by land area instead, 47.3% of McCullough Hills's footprint sits above 55 dBA, against a Nevada average of 27.1% and a national average of 28.1%.
What This Means if You're Moving to McCullough Hills
- Distance from highways matters more than the neighborhood name. Two homes in the same zip code can differ by 20 dBA if one sits 100 meters from Ir215s and the other 500 meters away. The model captures this at 100-meter resolution, so noise exposure changes block by block.
- Tree canopy can help reduce modeled noise exposure. Roughly 1% of McCullough Hills is under tree cover (much lighter than most neighborhoods), and the dominant land cover is medium-intensity developed land. Both are measured from federal USDA Forest Service and USGS satellite imagery at 30-meter resolution. Streets with 60% or higher canopy show 3 to 5 dBA lower noise than comparable streets with bare ground or pavement, which is why the per-place decay rate above already accounts for it.
- Airport noise is directional. Harry Reid International's approach paths concentrate aviation noise to the northwest. Neighborhoods to the southeast of downtown show no measurable contribution from the airport.
Sources & Methodology
The BestNeighborhood noise model is calibrated against nearly one million federal ground-truth measurements across four states. Road noise is computed from segment-level federal traffic data and propagated outward using physics-based acoustic decay, with attenuation rates that depend on the surrounding land cover.
Federal datasets used:
FHWA Highway Performance Monitoring System: road geometry, traffic counts, lane configuration
U.S. DoT Bureau of Transportation Statistics National Transportation Noise Map: aviation and rail noise, road calibration ground truth
USGS / MRLC National Land Cover Database: land cover and impervious surface coverage
USDA Forest Service Tree Canopy Cover: vegetation density for sound propagation
U.S. Census Bureau TIGER/Line: block-level geography and population
U.S. EPA Levels Document: 55 dBA outdoor reference level
All inputs are published federal datasets. Block-level noise is computed by combining road, rail, and aviation sound sources in the energy domain, the same physics used in professional environmental noise assessments. Read the full methodology.