Jordan Peak Info:

From Porterville take Hwy 190 about 42 miles east to the North Road (21S50). The North Road turnoff is just before Quaking Aspen Campground. Turn left (north) on the North Road and follow it about 8 miles to the Jordan Road (20S71). Turn left (west) on this road and follow it one mile until you reach a small turn-around area. The trail is signed and is labeled as 31E35 on the Forest Service map. It is 3/4 mile long and climbs about 500 feet. It starts off by switchbacking through a shady red fir forest but eventually you will rise above the trees and make your way around some rocky areas to the lookout. This is a beautiful hike to do in June and early July for seeing wildflowers.

The North Road is paved most of the way but turns to dirt before the Jordan Road. The Jordan Road is unpaved and may be rough in spots. A high-clearance vehicle is recommended.

An alternate approach is from Redwood Drive. Take Hwy 190 east of Porterville and go about 32 miles. About 5 miles past Camp Nelson turn left on Redwood Drive and go about 8 miles to Forest Service Road 20S08. Turn right on this unpaved road (high clearance and 4wd recommended) and go to the end of the road to the start of Trail 31E24.

Upon reaching the lookout, a sign may be posted that will inform you if the lookout is open for public visitation. A Forest Service employee resides at the Jordan Peak Lookout tower. It is utilized as an office as well as the home for the summer months while the lookout is on duty. This person is responsible for detecting fires and relaying radio messages to a dispatcher, who in turn sends firefighters and support equipment to extinguish the reported fire. The employee is usually on duty from 9 a.m. to 5 p.m., Friday through Tuesday, but may have the lookout closed due to fires or repair work. If the sign says open, you are welcome to visit the lookout, talk with the Forest Service employee, and enjoy the view, which is spectacular.

No more than 4 – 5 people are recommended on the lookout at a time, as there is very little space. Please sign the daily log so we know you have been there. The lookout has just a couple of simple rules for safety; please do not sit on the catwalk railing or lean against any part of the building, particularly the windows or smudge them. The lookout needs a clean, unobstructed view at all times. The windows are very fragile and break easily.

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So there's also a trail up from Belknap CG that connects with the Bear Creek trail

And apparently camp host @ Belknap says you can do a loop from Belknap CG, down the NRT, and then the Tule trail back to CG
which is apparently a 17mi loop

Mapsource has the Belknap trail! and looks like it does connect up in the area you thought
or maybe a bit higher actually

your hike was 15.6mi
but maybe 1/2 mile on that other trail
so lets say 15mi?
actually it was almost a half mile ONE way
so lets say 14.6mi

Eagle Mountain Casino is near Springville.  Anything worth checking out?  Buffet any good?