The Brockway 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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Partly cloudy
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Partly cloudy
Showers likely
70° on Nov. 13, 1999, the hottest reading for this week of the year since 1892. Next is 68° in 1953.
Brockway’s center stands about 1,150 ft above sea level. Within three miles the land runs from 1,050 ft to 1,230 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Gabbro, pyroxenite, diorite, and lamprophyre, from the Paleoproterozoic, 1.6 to 1.8 billion 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 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.
Orthogneiss, schist. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 10 mi of the line.
Schist, slate. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 9 mi of the line.
Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 3 mi of the line.
Gabbro, pyroxenite, diorite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 2 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 Brockway reaches the Gulf of America by way of Stony Creek and the Mississippi: about 1,930 river miles.
Lake on the way: Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Brockway; river miles along the main stem, rounded.
Brockway has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 4° in January. A normal year brings about 57 inches of snow; with the rain, that comes to about 31 inches of water.
On November 14 Brockway normally reaches 40° and falls to 25°. The record high is 67°, in 1990; the record low −4°, in 1919. The most rain on this date, 0.91 in, fell in 1909.
Normals 1991–2020 and records since 1892 at Collegeville St. John'S, 10 miles south-southwest. NOAA, through RCC-ACIS.
