The Trinity 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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17° on Nov. 13, 2019, the coldest reading for this week of the year since 1996. Next is 19° in 2013.
Trinity’s center stands about 640 ft above sea level. Within three miles the land runs from 560 ft to 840 ft, a difference of 280 ft: rolling country. The highest named summit within 15 miles is Torrence Hill, about 920 ft, 15 miles south.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 58×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 10 mi of the line.
Sandstone. Age: Carboniferous, 324 to 359 million years old. About 9 mi of the line.
Shale. Age: Carboniferous, 324 to 359 million years old. About 2 mi of the line.
Limestone, shale. Age: Carboniferous, 324 to 359 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 Trinity reaches the Gulf of America by way of Bakers Creek, the Tennessee, the Ohio and the Mississippi: about 1,320 river miles.
Lakes on the way: Guntersville Lake, White Lake (historical) and Pickwick Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Trinity; river miles along the main stem, rounded.
Trinity has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 32° in January. About 50 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1996 at Decatur Pryor Field, 9 miles east-northeast. NOAA, through RCC-ACIS.
