The Trowbridge 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.
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Trowbridge’s center stands about 50 ft above sea level. Within three miles the land runs from 30 ft to 60 ft, a difference of 30 ft: nearly flat ground. The highest named summit within 15 miles is Telegraph Hill, about 380 ft, 15 miles east-southeast.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 22 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Trowbridge reaches San Francisco Bay and the Pacific Ocean by way of Coon Creek and the Sacramento: about 85 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Trowbridge; river miles along the main stem, rounded.
