The Estacada 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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8° on Nov. 15, 1955, the coldest reading for this week of the year since 1909. Next is 19° in 1916.
Estacada’s center stands about 510 ft above sea level. Within three miles the land runs from 280 ft to 1,170 ft, a difference of 890 ft: hilly country. The highest named summit within 15 miles is South Fork Mountain, about 4,820 ft, 14 miles south-southeast.
Under the town center the state geologic map shows Lacustrine and fluvial sedimentary rocks (clay, silt, sand), from the Pleistocene, less than 2.6 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 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.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Sandstone-mudstone. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 6 mi of the line.
Volcanic, conglomerate, andesite. Age: Miocene, 5.3 to 23 million years old. About 5 mi of the line.
Sandstone, siltstone, mudstone. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 3 mi of the line.
Basalt, andesite, basaltic-andesite. Age: Early Miocene to Late Miocene, 10 to 17 million years old. About 2 mi of the line.
Basaltic-andesite, basalt. Age: Early Pliocene to Pleistocene, 1.2 to 3.9 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 Estacada reaches the Pacific Ocean by way of the Clackamas, the Willamette and the Columbia: about 140 river miles.
100 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Estacada; river miles along the main stem, rounded.
Estacada has a warm-summer Mediterranean climate. Summer afternoons average 83° in August; winter nights fall to about 35° in January. About 58 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Estacada normally reaches 55° and falls to 39°. The record high is 67°, in 2019; the record low 12°, in 1955. The most rain on this date, 1.65 in, fell in 1918.
Normals 1991–2020 and records since 1909 at Estacada 2 SE, here. NOAA, through RCC-ACIS.
