Category: Structural Design

What Is Riprap? And Why It Rocks!

What is Riprap? Riprap describes a range of rocky material placed along shorelines, bridge foundations, steep slopes, and other shoreline structures to protect from scour and erosion. Rocks used range from 4 inches to over 2 feet. The size of the rock needed on a project depends on the steepness of the slope and how… Read More »

What Is Bridge Scour? Why Should You Care?

The most common cause of bridge failures is from floods scouring bed material surrounding bridge foundations. What is scour? Simply put, scour is the engineering term for the erosion of soil surrounding a bridge foundation (piers and abutments). Bridge scour occurs when fast-moving water around a bridge removes sediment from… Read More »

How Much Weight is Too Much for a Bridge? Engineers’ Ratings Have the Answer

In mid-May of 2018 a driver crossing a bridge in the Town of Lafayette in Chippewa County, Wisconsin, noticed something was wrong with the bridge. Town officials quickly saw the problem – the bridge had a major crack in the deck, and a pier pile holding up the bridge had buckled, causing the bridge to… Read More »