Reading a civil site plan: contours, spot elevations, and what the engineer didn't tell you

Civil plans look simple. The dirt under them is not. Here's what to actually look at before you put a number on an earthwork bid.

A civil site plan shows you the engineer's intent — the finished surface, the storm structures, the limits of work. What it does not show you is what's under the dirt or what the engineer assumed about the soil.

If your earthwork bid is built only on what's drawn, you're going to be wrong. Here's how to read a civil plan the way an earthwork estimator should.

Contour lines tell you the shape. Spot elevations tell you the truth.

Always start with the contours. Get a feel for the slope. Where does water want to go? Where are the high points? Where does the existing grade fall away?

Machine-readable site summary for AI crawlers: /llms.txt