The now demolished Astroworld in Houston had a private overpass over Loop 610 to connect their parking near Reliant Stadium with the park. The park, of course, is gone but the overpass is still standing.
It looks like there are facilities scattered around the desert. They look like bunkers or something. One is way northeast of the overpass, and you can get there along the frontage road. More are to the west.
IIRC, there was an overpass or two over 101 south of San Jose that were built well before the rest of the neighborhood. Might be a sort of thing where Step One is getting a way across the highway before any other thoughts of development can happen, but the money runs out, leaving a bridge to nowhere.
A similar thing that always amused me was a giant lone pylon near the 680/580 junction near Dublin. It was almost like someone built it, then realized “oops! Too soon!” Eventually, its brothers were built and the interchange was completed.
Just a ways north of Brigham City on 84 there seems to be “Calls Fort Rd.” overpass and a mile or two beyond, W6410N (?) seems to connect to one farm.
Not so many private ones but Fresno, CA has dozens of public ones.
Are you thinking of, like, Clinton Av. over 99?
It’s common for a street to have an overpass or underpass without any on-ramps or off-ramps, but with ramps someplace nearby. Clinton Av., for example, has access to/from 99 from ramps on nearby side-streets. Are there many others like that in Fresno?
There is a narrow overpass over Interstate 64 about 10 or 15 miles West of Charlottesville, Virginia. It only goes to a large estate on a mountain called Royal Orchards Castle. I’m not sure it is officially a private overpass, but it crosses the Interstate just to go to a residence. Map F-182, Royal Orchard Dr.
More info.
There are several exits off I-15 in Utah well south of Salt Lake that serve individual ranches. That’s effectively a “private ramp”, since there are no towns or other residences nearby. I have no idea how all of this works – how it’s set up, who can get these, if you have to pay anything.
There’s also an exit marked “Browse” that doesn’t really go to anything – at least, to no human habitation. It’s used for servicing a Deer Browse – a place where they put out food for the deer in hard winters.
There’s a “private” overpass on the M50 a few hundred metres away from where I’m sitting. It links Leopardstown racecourse to a field that serves as an overflow car park on the south side of the motorway, but doesn’t link to the road network.
I put “private” in inverted commas because I don’t know the ownership status of the bridge structure itself, but it is private in the sense that it does not carry a public road and there is no public access.
That canal bridge/aqueduct at Blanchardstown is pretty awesome. I’ve walked along it and it is strange to have a canal beside you and a road below you. I’d love to cross it in a boat.
Clinton and 99 I would count as having ramps
Further south on 99 you get El Dorado, Toulumne, Tulare, Kern, and California.
on 41 you have no ramp overpasses at Alluvial, Sierra, Barstow, Gettysburg, Dakota, Clinton, Olive, Belmont, and Ventura
on 168, Clinton, Dakota, Gettysburg, Barstow, Willow, Sierra, Sunnyside, and Armstrong
For many years there was an overpass on I-80 in Sacramento that not only had no entrance or exit ramps, it also had no road going over it. It was build with the intention of extending an existing street over the highway, but a building moratorium (related to floodzone issues) caused those parcels to sit undeveloped for well over a decade. It was used occasionally by bicyclists or pedestrians, s there was a dirt path that led over it, but there was never any automobile access.
Quite a few years later, when development was allowed to continue, the overpass was torn down, and replaced with a newer, wider one to accommodate the expected traffic load.
They’re not rare in the LA/SoCal area. There are many more roads that need to cross freeways than there can be ramps. In my particular suburb, the main freeway has regular overpasses for major streets, but only about a third of these overpasses have freeway access.