Big Indian gorge is accessed from the back of the South CG. A mile or so back to the creek, then you go into the gorge. Tevas for stream crossings. Back in about 5-6 miles is a crack in the basalt where the creek pours through from above.
Little Blitzen ban be accessed from above, exited from below if you have a shuttle arranged. The trail in from above starts at Nye Cabin. The 3Pins and I were in there (Nye) last year. It is a tight road, with low hanging Aspens, a few downed limbs and rocky. The cabin itself is now in the wilderness area. The trail is steep, with lots of switch backs, and HOT in the afternoon sun. The road into Nye is above Jackman Park. Talk to BLM Burns if you don’t have a map. Not sure when deer season is, but caution if it is open.
You can also access from near the South CG.
Wildhorse is great, but don’t be there if there’s a chance of lightning. Bighorn sheep are often in the area under the summit of the mt.
http://ski3pin.blogspot.com/2017/08/hart-mountain-steens-mountain-oregon.html