Between Tecate and the small town of Campo there is valley with 1.3 miles of border where there is no barrier, at all. Campo creek crosses the border at this location. The community is called “Canyon City”. The Border Patrol apparently calls this part of the border “Trestle Valley”, because an old railroad bridge is there.
Even though there are a couple of gaps in the border fence in California, the fence overall is much better than it was a couple of years ago. A small gap does not negate the rest of the fence that has been built. A border barrier is not an all-or-nothing situation. The new fence may not be perfect, but it is a great help to the Border Patrol. When it becomes more difficult to cross and fewer places to cross, the price goes up and fewer people can afford to cross. It becomes physically more risky to cross, also.
On either side of this gap are several hundred yards of older bollard fence, built at the end of the Bush term or early in the Obama term in office. The Secure Fence Act of 2006 is what authorized the building of a barrier on the border in response to the 9/11 attacks. Bush began building the new steel bollard fence and it was continued for a time under Obama. It wasn’t a political football at that time and Obama didn’t stop it immediately, but he didn’t finish it either.
The current fence built by Trump is very similar to the earlier steel-bollard design, just generally higher, about 28-30 feet. This is the fence that the Border Patrol wanted. Along the 160-mile California border there is about 50-60 miles of the old Bus/Obama fence and about the same amount was built by Trump.