Beautiful views, but they are largely concealed by the trees. To really see the good views you need to be willing and able to hike down the trail beyond the parking area.
The Trail is a primitive trail and a little steep in some places (could be a challenge for some small children or elderly).
Also at the top of the trail there is a trail guide you can pick up for a $1 donation which highlights many facts, animals, etc along the trail as you hike.
The drive is longish - like 45 minutes, the hike (at the very top) says 2 miles round trip but my fitbit logged 3.7 miles round trip. That took 40-50 minutes out and 30 minutes back. Up is up up, and w some narrow areas. Back in is downhill mostly and easier/shorter since you’re not stopping as often. I am from Texas (sea level) and been in Utah for 3 years - I got winded when walking fast; it is steep and high in elevation. There are no fences or railings except at the top. There are 16 markers - the first 9 go slow but after that theyre closer together) There are 2 benches (1 bench after 7 and I don’t recall the other sorry).
All said... the drive + hike is 1,000% worth it!!!
Ive included some photos of the outlooks (escallante), during the climb, and the top of Harpers Corners Trail.
Visited in 2019. Understand this is only worth visiting if you are willing to go for a ~3 mile round trip hike on a mildly rugged trail. The view from the parking lot (at the end of a long paved road) isn't much. If you are willing to make the walk, the view from the end of the trail is sensational. You can't actually see the confluence of the Green and Yampa rivers (it's hidden behind Steamboat Rock) but the contortion of geologic layers is sensational. Note that it's a desert hike. Bring your own water, lots of it because even if it's not scorching hot (it wasn't the day I went), the air will suck the moisture right out of you.
Note this is a separate entrance to Dinosaur National Monument (the main entrance/visitor center is in Vernal, UT). A pass to the main monument should also get you in here.
Fun fact: despite this being the geographical center of nowhere, I had a cell signal. Probably from a tower 30 or 40 miles away.
The drive out is fairly long with changing views. The view at the parking area is very limited. To really enjoy this site you need to hike 3+ miles round trip to the site overlooking the confluence of the Green and Yampa rivers. Hike is over rough ground, but relatively easy. The views form the west side and the north/east side are very different (NE has the best views in my opinion.)