The Gretna 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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86° on Nov. 14, 1999, the hottest reading for this week of the year since 1968. Next is 78° in 2012.
Gretna’s center stands about 1,190 ft above sea level. Within three miles the land runs from 1,100 ft to 1,290 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Kansas City Group (limestone, shale), from the Carboniferous, 299 to 324 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 61×. 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, shale. Age: Early Cretaceous, 100 to 145 million years old. About 21 mi of the line.
Limestone, shale. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Shale, limestone. 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 Gretna reaches the Gulf of America by way of South Papillion Creek, Papillion Creek, the Missouri and the Mississippi: about 1,780 river miles.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Gretna; river miles along the main stem, rounded.
Gretna has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 12° in January. A normal year brings about 20 inches of snow; with the rain, that comes to about 30 inches of water.
On November 14 Gretna normally reaches 51° and falls to 27°. The record high is 86°, in 1999; the record low 4°, in 2014. The most rain on this date, 0.87 in, fell in 1972.
Normals 1991–2020 and records since 1968 at Mead 6 S, 15 miles west. NOAA, through RCC-ACIS.
