The Monongahela 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.
Mostly cloudy
Chance of showers; warmer
Mostly cloudy
Sunny
Sunny
Mostly sunny
Mostly sunny
79° on Nov. 16, 1987, the hottest reading for this week of the year since 1951. Next is 79° in 2020.
Monongahela’s center stands about 980 ft above sea level. Within three miles the land runs from 770 ft to 1,320 ft, a difference of 550 ft: hilly country. The highest named summit within 15 miles is Devies Mountain, about 2,780 ft, 13 miles east-southeast.
Under the town center the state geologic map shows Monongahela Group (limestone, shale, sandstone), from the Carboniferous, 299 to 324 million years old.
The section below crosses 10 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.
Shale, clastic. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Sandstone, shale. Age: Permian, 252 to 299 million years old. About 5 mi of the line.
Limestone, shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 5 mi of the line.
Sandstone, shale. Age: Permian, 252 to 299 million years old. About 3 mi of the line.
Sandstone, shale. Age: Carboniferous to Permian, 252 to 324 million years old. About 2 mi of the line.
Shale. Age: Carboniferous, 299 to 324 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. 4 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 Monongahela reaches the Gulf of America by way of Whiteley Creek, the Monongahela, the Ohio and the Mississippi: about 2,030 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 Monongahela; river miles along the main stem, rounded.
Monongahela has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 21° in January. About 45 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1951 at Point Marion Lock 8, 6 miles south-southeast, 170 ft lower. NOAA, through RCC-ACIS.
