The Eagle Rock 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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81° on Nov. 12, 1989, the hottest reading for this week of the year since 1911. Next is 80° in 1911.
Eagle Rock’s center stands about 970 ft above sea level. Within three miles the land runs from 910 ft to 1,470 ft, a difference of 560 ft: hilly country. The highest named summit within 15 miles is Whitney Mountain, about 1,820 ft, 14 miles southwest.
Under the town center the state geologic map shows Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (dolostone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 27×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 15 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 2 mi of the line.
Sandstone, shale, limestone. Age: Carboniferous, 324 to 359 million years old. About 0.9 mi of the line.
Limestone, siltstone. Age: Carboniferous, 324 to 359 million years old. About 0.6 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 Eagle Rock reaches the Gulf of America by way of Table Rock Lake, the White River and the Mississippi: about 1,190 river miles.
Lake on the way: Table Rock Lake.
620 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Eagle Rock; river miles along the main stem, rounded.
Eagle Rock has a humid subtropical climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. About 47 inches of rain fall in a normal year.
On November 14 Eagle Rock normally reaches 58° and falls to 36°. The record high is 76°, in 2025; the record low 9°, in 1986. The most rain on this date, 0.86 in, fell in 1978.
Normals 1991–2020 and records since 1911 at Cassville 1 NE, 11 miles north-northwest, 350 ft higher. NOAA, through RCC-ACIS.
