Well, the Rubicon/McKinney Road in Northern California crosses the Rubicon river at one point close to Lake Tahoe. Early settlers named the Rubicon river after its counterpart in Italy - a small river 150 miles north of Rome.
But historically "Rubicon" has more significance than just the name of two rivers. There is a reason why wines and companies bear the name Rubicon.
Julius Caesar put the name Rubicon in all history books and anyone struggling with Latin in school probably still remembers the Rubicon in connection with Caesar's famous words "alea iacta est!" - "the die is cast!"
The significance of Caesar exclaiming "alea iacta est" was that by crossing the Rubicon, he was at the point of no return; he was declaring war on Rome.
here is the story from the history books
So, "crossing the Rubicon" means, you went beyond a point of no return. That's why startup companies like the name for their company or product.
It is an expression still used by educated people around the globe. "Crossing the Rubicon" It is still found in the Webster.
The Rubicon/McKinney Road was established in the 1800's as a stage coach road between Georgetown and Lake Tahoe mainly to serve two resort hotels at Wentworth Springs and Rubicon Springs. After the hotels went out of business and the road deteriorated it was picked as home for the first Jeepers Jamboree in 1953. Since then it has gained international recognition and is considered the Mecca for fourwheelers.
here is the long version of location and history
another historic view
The legal status of the Rubicon Trail is that it is an unmaintained county right of way - the Rubicon/McKinney Road.
Aside from the Rubicon Trail for fourwheelers there is another Rubicon Trail, a real trail, for hikers in the same general area.
Here is more about the D.L. Bliss Rubicon Trail.
or try google on the Rubicon Trail for hikers
On a side note. Only few people in the US know the meaning of Rubicon since (classic) education is not one of our strong sides. During a trip on Cuba, I was wearing one my Rubicon T-shirts, I was approached by a baggage handler at the small airport of Santiago: "Yeah, I remember, Rubicon, isn't that the River Caesar crossed in 48 BC?" Well, he was a year off, but I was impressed - would your hear a remark like it from a baggage handler in the US?