The Long Barn 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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6.70 inches of rain fell in two days, the most for this week of the year since records began in 1955. The next wettest, 6.13 inches, fell in 2017.
Long Barn’s center stands about 5,070 ft above sea level. Within three miles the land runs from 3,920 ft to 5,680 ft, a difference of 1,760 ft: steep hill country. The highest named summit within 15 miles is Pinecrest Peak, about 8,430 ft, 14 miles northeast.
Under the town center the state geologic map shows Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range) (andesite), from the Late Oligocene to Pleistocene, 2 to 24 million years old.
The section below crosses 3 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.
Andesite. Age: Late Oligocene to Pleistocene, 2 to 24 million years old. About 11 mi of the line.
Argillite, quartzite, phyllite. Age: Ordovician to Triassic, 202 to 487 million years old. About 8 mi of the line.
Granodiorite. Age: Permian to Tertiary, 2.6 to 260 million years old. About 5 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 Long Barn reaches San Francisco Bay and the Pacific Ocean by way of Sugarpine Creek, the North Fork Tuolumne, the Tuolumne, the San Joaquin and New York Slough: about 180 river miles.
Lake on the way: Don Pedro Reservoir.
80 miles of the trip are on the San Joaquin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Long Barn; river miles along the main stem, rounded.
Long Barn has a hot-summer Mediterranean climate. Summer afternoons average 89° in July; winter nights fall to about 31° in January. A normal year brings about 108 inches of snow; with the rain, that comes to about 49 inches of water.
On November 14 Long Barn normally reaches 58° and falls to 36°. The record high is 74°, in 1995; the record low 13°, in 1964. The most rain on this date, 4.10 in, fell in 1981.
Normals 1991–2020 and records since 1955 at Cherry Valley Dam, 14 miles southeast, 300 ft lower. NOAA, through RCC-ACIS.
