The O'Hara 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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74° on Nov. 11, 2020, the hottest reading for this week of the year since 1905. Next is 70° in 2021.
O'Hara’s center stands about 940 ft above sea level. Within three miles the land runs from 710 ft to 1,270 ft, a difference of 560 ft: hilly country. The highest named summit within 15 miles is Rich Hill, about 1,290 ft, 6 miles north-northeast.
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 31×. 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 14 mi of the line.
Shale. Age: Carboniferous, 299 to 324 million years old. About 9 mi of the line.
Limestone, shale, sandstone. 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.
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 O'Hara reaches the Gulf of America by way of the Allegheny, the Ohio and the Mississippi: about 1,950 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 O'Hara; river miles along the main stem, rounded.
O'Hara has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. About 44 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1905 at Acmetonia Lock 3, 4 miles northeast, 190 ft lower. NOAA, through RCC-ACIS.
