Remember that the graph represents
AVERAGE slope. Some sections of the stream or road may be steeper,
while other sections are less steep.
Flat as Farmland? Lake Avenue in downtown Duluth, with a slope of
11.9% or 6.8°, is a pretty steep street - REALLY!
The lines on the graph above look pretty flat, but consider the following:
• The maximum street slope allowed by the MN Department
of Transportation for new road construction is 12% or 6.8° (and
only 3% or 1.7° on freeways)
• Sand dunes (that can be very difficult to climb!)
have maximum slopes of 68% or 34°.
