The Heimdal 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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69° on Nov. 13, 2025, the hottest reading for this week of the year since 1942. Next is 68° in 1979.
Heimdal’s center stands about 1,580 ft above sea level. Within three miles the land runs from 1,510 ft to 1,640 ft, a difference of 130 ft: gently rolling country. The highest named summit within 15 miles is Butte de Morale, about 1,740 ft, 10 miles west-northwest.
Under the town center the state geologic map shows Pierre Formation (shale), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 2 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.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 16 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 8 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 Heimdal reaches Hudson Bay by way of Big Slough, the Sheyenne, the Red River of the North and the Nelson: about 1,590 river miles. Past the border it runs north through Canada to Hudson Bay.
Lake on the way: Lake Winnipeg.
510 miles of the trip are on the Sheyenne.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Heimdal; river miles along the main stem, rounded.
Heimdal has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about −2° in January. About 19 inches of rain fall in a normal year.
On November 14 Heimdal normally reaches 36° and falls to 17°. The record high is 68°, in 2001; the record low −7°, in 1986. The most rain on this date, 0.45 in, fell in 1944.
Normals 1991–2020 and records since 1942 at Harvey 4 NE, 10 miles west. NOAA, through RCC-ACIS.
