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Building Trump's Wall? 6 Things to Know About the U.S.-Mexico Border

By Elizabeth Aguilera, CALmatters

1. There already is a "wall" along about a third of the border

The border runs about 1,900 miles from the Pacific Ocean to the Gulf of Mexico. Some sort of barrier — made from concrete, steel mesh and/or barbed wire — currently stands along about a third of it, in areas U.S. Customs and Border Protection deems vulnerable to illicit cross-border activity. Some segments are a solid metal wall; others are composed of various materials and have spaces between barriers or mesh, making those sections less a wall than a fence. Types include:

Primary fencing, typically 18 feet high with steel bollards or pickets to impede pedestrians and vehicles.

Secondary fencing, typically 15 feet high and constructed with horizontal rails in the form of steel tubes and fence fabric that is either mesh or perforated metal sheeting.

Read the complete story at CALmatters.