The Sachse 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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87° on Nov. 15, 2025, the hottest reading for this week of the year since 1946. Next is 84° in 2013.
Sachse’s center stands about 550 ft above sea level. Within three miles the land runs from 460 ft to 580 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Ozan Formation (claystone), from the Late Cretaceous, 66 to 72 million years old.
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 59×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Marlstone, chalk. Age: Late Cretaceous, 66 to 100 million years old. About 10 mi of the line.
Claystone. Age: Late Cretaceous, 66 to 72 million years old. About 7 mi of the line.
Clay. Age: Late Cretaceous, 66 to 72 million years old. About 5 mi of the line.
Sandstone-mudstone. Age: Late Cretaceous, 66 to 72 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 Sachse reaches Galveston Bay and the Gulf of America by way of Long Branch, Muddy Creek, the East Fork Trinity and the Trinity: about 450 river miles.
Lakes on the way: Woodlands Golf Course Lake and Corder Lake.
220 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sachse; river miles along the main stem, rounded.
Sachse has a humid subtropical climate. Summer afternoons average 95° in August; winter nights fall to about 36° in January. About 42 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1946 at Richardson, 9 miles west, 130 ft higher. NOAA, through RCC-ACIS.
