The Hebo 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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5.63 inches of rain fell in two days, the most for this week of the year since records began in 1940. The next wettest, 5.09 inches, fell in 2021.
Hebo’s center stands about 180 ft above sea level. Within three miles the land runs from 10 ft to 1,620 ft, a difference of 1,610 ft: steep hill country. The highest named summit within 15 miles is Mount Hebo, about 3,170 ft, 7 miles east.
Under the town center the state geologic map shows Marine facies (basalt), from the Middle Eocene to Late Eocene, 34 to 48 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. 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. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 8 mi of the line.
Shale, siltstone. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 2 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Basalt. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 2 mi of the line.
Gabbro, hypabyssal-basalt. Age: Miocene, 5.3 to 23 million years old. About 1 mi of the line.
Mudstone. Age: Middle Eocene to Late Eocene, 34 to 48 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. 2 smaller units along the line are not listed.
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 Hebo reaches Nestucca Bay and the Pacific Ocean by way of the Three Rivers, the Nestucca and Nestucca Bay: about 13 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hebo; river miles along the main stem, rounded.
Hebo has a warm-summer Mediterranean climate. Summer afternoons average 70° in August; winter nights fall to about 39° in December. About 80 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Hebo normally reaches 56° and falls to 42°. The record high is 69°, in 1995; the record low 26°, in 1959. The most rain on this date, 2.63 in, fell in 1942.
Normals 1991–2020 and records since 1940 at Cloverdale, 2 miles southwest, 170 ft lower. NOAA, through RCC-ACIS.
