The Lodoga 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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86° on Nov. 14, 1995, the hottest reading for this week of the year since 1926. Next is 84° in 1932.
Lodoga’s center stands about 1,220 ft above sea level. Within three miles the land runs from 1,200 ft to 2,070 ft, a difference of 870 ft: hilly country. The highest named summit within 15 miles is Saint John Mountain, about 6,720 ft, 14 miles northwest.
Under the town center the state geologic map shows Lower Cretaceous marine rocks (siltstone-mudstone), from the Early Cretaceous, 113 to 145 million years old.
The section below crosses 6 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.
Siltstone-mudstone. Age: Early Cretaceous, 113 to 145 million years old. About 8 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 5 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 4 mi of the line.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 3 mi of the line.
Siltstone-mudstone. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 3 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 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 Lodoga reaches San Francisco Bay and the Pacific Ocean by way of Little Stony Creek, Stony Creek and the Sacramento: about 260 river miles.
Lake on the way: Black Butte Lake.
180 miles of the trip are on the Sacramento.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lodoga; river miles along the main stem, rounded.
Lodoga has a hot-summer Mediterranean climate. Summer afternoons average 96° in July; winter nights fall to about 33° in December. About 21 inches of rain fall in a normal year.
On November 14 Lodoga normally reaches 65° and falls to 38°. The record high is 86°, in 1995; the record low 20°, in 1929. The most rain on this date, 1.84 in, fell in 1972.
Normals 1991–2020 and records since 1926 at Stony Gorge Reservoir, 20 miles north, 420 ft lower. NOAA, through RCC-ACIS.
