The Alderpoint 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.
Chance of showers
Showers likely
Showers likely
Showers likely
Showers likely
Chance of showers
Mostly cloudy
Alderpoint’s center stands about 480 ft above sea level. Within three miles the land runs from 260 ft to 2,290 ft, a difference of 2,030 ft: mountain country. The highest named summit within 15 miles is Black Lassic, about 5,840 ft, 12 miles north-northeast.
Under the town center the state geologic map shows Franciscan Complex, unit 1 (Coast Ranges) (sandstone, mudstone), from the Jurassic to Cretaceous, 66 to 202 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 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 23 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 million 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.
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 Alderpoint reaches the Pacific Ocean by way of the Eel: about 75 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Alderpoint; river miles along the main stem, rounded.
