Analysis of information sources in references of the Wikipedia article "Tijuana River" in English language version.
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(help)Construction on the primary fence, stretching from the Pacific Ocean to Otay Mountain, began in 1989. Made of 10-foot-tall Vietnam-era helicopter landing mats, this fence was welcome but proved ineffective. In 1996, the secondary fence of steel mesh was installed. Apprehensions of illegal border crossers in the area steeply declined as crossing routes moved farther east.
On occasion, such as heavy rains early in 1980, it has spilled into farming areas such as Smuggler's Gulch, near the border, making them unfit for raising food.