The Lebanon 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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70° on Nov. 12, 1981, the hottest reading for this week of the year since 1973. Next is 69° in 1976.
Lebanon’s center stands about 350 ft above sea level. Within three miles the land runs from 310 ft to 940 ft, a difference of 630 ft: hilly country. The highest named summit within 15 miles is Keel Mountain, about 2,810 ft, 14 miles east.
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 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt, basaltic-andesite. Age: Oligocene to Miocene, 5.3 to 34 million years old. About 7 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Gravel, boulders, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 4 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Basalt, basaltic-andesite. Age: Oligocene to Miocene, 5.3 to 34 million years old. About 3 mi of the line.
Mafic-volcanic, felsic-volcanic, clastic. Age: Tertiary, 2.6 to 66 million years old. About 0.9 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 Lebanon reaches the Pacific Ocean by way of the South Santiam, the Santiam, the Willamette and the Columbia: about 230 river miles.
Lake on the way: Willamette Falls Hydroelectric Power Reservoir.
100 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lebanon; river miles along the main stem, rounded.
Lebanon has a warm-summer Mediterranean climate. Summer afternoons average 82° in August; winter nights fall to about 33° in January. About 57 inches of rain fall in a normal year, with about 2 inches of snow.
On November 14 Lebanon normally reaches 52° and falls to 37°. The record high is 69°, in 1999; the record low 18°, in 1978. The most rain on this date, 1.86 in, fell in 2014.
Normals 1991–2020 and records since 1973 at Lacomb 3 NNE, 11 miles northeast, 170 ft higher. NOAA, through RCC-ACIS.
