The Genoa 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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4.43 inches of rain fell in two days, the most for this week of the year since records began in 1892. The next wettest, 4.38 inches, fell in 1957.
Genoa’s center stands about 370 ft above sea level. Within three miles the land runs from 290 ft to 450 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Terrace deposits (coarse-detrital, fine-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand, fine-detrital. Age: Early Eocene, 48 to 56 million years old. About 13 mi of the line.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 3 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.7 mi of the line.
Clay, sand. Age: Paleocene to Eocene, 34 to 66 million years old. About 0.3 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 Genoa reaches the Gulf of America by way of Dry Creek, Beech Creek, McKinney Bayou, the Red River, the Atchafalaya and the Lower Atchafalaya: about 490 river miles.
330 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Genoa; river miles along the main stem, rounded.
Genoa has a humid subtropical climate. Summer afternoons average 93° in July; winter nights fall to about 35° in January. About 49 inches of rain fall in a normal year.
On November 14 Genoa normally reaches 65° and falls to 44°. The record high is 86°, in 1955; the record low 20°, in 1940. The most rain on this date, 1.60 in, fell in 1915.
Normals 1991–2020 and records since 1892 at Texarkana Webb Field, 7 miles northwest. NOAA, through RCC-ACIS.
