The Logan 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.
Mostly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
Mostly sunny; warmer
Partly cloudy
Showers likely; warmer
86° on Nov. 14, 1999, the hottest reading for this week of the year since 1893. Next is 83° in 2016.
Logan’s center stands about 1,960 ft above sea level. Within three miles the land runs from 1,910 ft to 2,120 ft, a difference of 210 ft: rolling country.
Under the town center the state geologic map shows Alluvium (sand, silt, clay), from the Pleistocene to Holocene, less than 2.6 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 44×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt. Age: Pleistocene to Holocene, less than 2.6 million years old. About 12 mi of the line.
Shale, limestone. Age: Late Cretaceous, 66 to 100 million years old. About 7 mi of the line.
Arkose. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 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 Logan reaches the Gulf of America by way of Crooked Creek, the North Fork Solomon, the Solomon, the Smoky Hill, the Kansas, the Missouri and the Mississippi: about 2,040 river miles.
Lakes on the way: Waconda Lake and Kirwin Reservoir.
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 Logan; river miles along the main stem, rounded.
Logan has a hot-summer humid continental climate. Summer afternoons average 92° in July; winter nights fall to about 16° in January. A normal year brings about 22 inches of snow; with the rain, that comes to about 23 inches of water.
On November 14 Logan normally reaches 56° and falls to 28°. The record high is 86°, in 1999; the record low −11°, in 1940. The most rain on this date, 0.50 in, fell in 1947.
Normals 1991–2020 and records since 1893 at Norton 9 SSE, 15 miles west-northwest, 450 ft higher. NOAA, through RCC-ACIS.
