The Ridgway 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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75° on Nov. 11, 2020, the hottest reading for this week of the year since 1893. Next is 72° in 2012.
Ridgway’s center stands about 1,430 ft above sea level. Within three miles the land runs from 1,380 ft to 2,220 ft, a difference of 840 ft: hilly country. The highest named summit within 15 miles is Boone Mountain, about 2,410 ft, 13 miles south-southeast.
Under the town center the state geologic map shows Shenango Formation through Oswayo Formation, undivided (sandstone, siltstone, shale), from the Devonian to Carboniferous, 324 to 422 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 21×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Carboniferous, 299 to 324 million years old. About 12 mi of the line.
Sandstone, conglomerate. Age: Carboniferous, 299 to 324 million years old. About 9 mi of the line.
Sandstone, siltstone, shale. Age: Devonian to Carboniferous, 324 to 422 million years old. About 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 Ridgway reaches the Gulf of America by way of the Clarion, the Allegheny, the Ohio and the Mississippi: about 2,130 river miles.
970 miles of the trip are on the Ohio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ridgway; river miles along the main stem, rounded.
Ridgway has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 16° in January. A normal year brings about 53 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 Ridgway normally reaches 50° and falls to 30°. The record high is 68°, in 2010; the record low 7°, in 1996. The most rain on this date, 1.40 in, fell in 1972.
Normals 1991–2020 and records since 1893 at Ridgway, here. NOAA, through RCC-ACIS.
