The Gresham 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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71° on Nov. 14, 1999, the hottest reading for this week of the year since 1965. Next is 70° in 2001.
Gresham’s center stands about 320 ft above sea level. Within three miles the land runs from 130 ft to 950 ft, a difference of 820 ft: hilly country. The highest named summit within 15 miles is Lookout Point, about 2,680 ft, 15 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.
Silt, sand, gravel. 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.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 4 mi of the line.
Basaltic-andesite, basalt. Age: Early Pliocene to Pleistocene, 1.2 to 3.9 million years old. About 4 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. Age: Miocene, 5.3 to 23 million years old. About 0.3 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 Gresham reaches the Pacific Ocean by way of Fairview Creek, Columbia Slough and the Columbia: about 120 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 Gresham; river miles along the main stem, rounded.
Gresham has a warm-summer Mediterranean climate. Summer afternoons average 81° in July; winter nights fall to about 35° in January. About 48 inches of rain fall in a normal year.
On November 14 Gresham normally reaches 52° and falls to 41°. The record high is 71°, in 1999; the record low 23°, in 1985. The most rain on this date, 1.20 in, fell in 1966.
Normals 1991–2020 and records since 1965 at Portland Troutdale Airport, 4 miles north-northeast, 300 ft lower. NOAA, through RCC-ACIS.
