The Three Bridges plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
Partly cloudy
Mostly sunny; warmer
Partly cloudy
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
74° on Nov. 12, 2006, the hottest reading for this week of the year since 1956. Next is 74° in 2020.
Three Bridges’s center stands about 140 ft above sea level. Within three miles the land runs from 80 ft to 270 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Fox Hill, about 1,040 ft, 15 miles north.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone, shale. Age: Early Jurassic to Late Jurassic, 145 to 202 million years old. About 12 mi of the line.
Siltstone. Age: Late Triassic to Early Jurassic, 175 to 237 million years old. About 4 mi of the line.
Siltstone-mudstone, sandstone-mudstone. Age: Late Triassic, 202 to 237 million years old. About 2 mi of the line.
Plutonic. Age: Early Jurassic, 175 to 202 million years old. About 2 mi of the line.
Plutonic. Age: Jurassic, 145 to 202 million years old. About 1 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 smaller units along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Three Bridges reaches New York Harbor and the Atlantic Ocean by way of the South Branch Raritan and the Raritan: about 40 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Three Bridges; river miles along the main stem, rounded.
Three Bridges has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 22° in January. A normal year brings about 24 inches of snow; with the rain, that comes to about 51 inches of water.
Normals 1991–2020 and records since 1956 at Wertsville 4 NE, 5 miles south-southeast, 140 ft higher. NOAA, through RCC-ACIS.
