The Rhododendron 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.
Showers likely
Showers likely
Chance of showers
Chance of showers
Chance of showers
Partly cloudy
Partly cloudy
Rhododendron’s center stands about 2,420 ft above sea level. Within three miles the land runs from 1,900 ft to 4,750 ft, a difference of 2,850 ft: mountain country. The highest named summit within 15 miles is Mount Hood, about 11,150 ft, 9 miles east-northeast.
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 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 3×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basaltic-andesite, andesite. Age: Quaternary, less than 2.6 million years old. About 10 mi of the line.
Volcanic, conglomerate, andesite. Age: Miocene, 5.3 to 23 million years old. About 4 mi of the line.
Basalt, andesite, basaltic-andesite. Age: Early Miocene to Late Miocene, 10 to 17 million years old. About 4 mi of the line.
Diorite, quartz-diorite. Age: Early Miocene to Late Miocene, 8 to 22 million years old. About 3 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Age: Holocene, less than 12,000 years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Rhododendron reaches the Pacific Ocean by way of Camp Creek, the Zigzag, the Sandy and the Columbia: about 170 river miles.
120 miles of the trip are on the Columbia.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rhododendron; river miles along the main stem, rounded.
