Category: Land Surveying

Sagging Saga: State Sums Up Bridge’s Dip

The Wisconsin Department of Transportation (WisDOT) has released a draft executive summary of its report on the sagging of Green Bay’s signature bridge, the Leo Frigo Memorial Bridge, which carries traffic on Interstate 43 over the Fox River near the bay. When a section of the bridge dipped about 2 feet a year ago on… Read More »

X Marks the Spot: What Is That Thing?

Ever notice those big white X’s painted on roads? If you haven’t, you’ll probably start noticing them now. (And you may also see T- or L-shaped versions). They’re known as aerial targets, and their purpose is to provide control for aerial mapping flights. But it’s not control in the conventional sense of “control freak.” In… Read More »

Remote Catamaran Retrieves Data and Keeps Surveyors Safe

Conditions are sometimes too dangerous for water resources engineers to get up close and personal to collect hydrographic survey data at bridges. When scouting bridges in 2012, Ayres Associates’ staff decided one bridge – U.S. Highway 8 over the St. Croix River in Polk County, Wisconsin – was impassable by jet boat and not navigable… Read More »