Sorry Rich, you got some bum information. UP's Conda Branch is a little bit of a misnomer since it actually connects/becomes a branch extends well beyond Conda - UP's Dry Valley Branch where the mines are, not to be confused with the Dry Valley Railroad which went to a different mining area.

UP Conda Branch
MP 0.0 Soda Springs (junction with UP main)
MP 1.8 Monsanto (Phosphorus plant)
MP 6.0 EPCO (junction)
MP 7.0 Conda (successor company was Agrium in 2005 for this former Stauffer/RHone-Pounlenc/Rhodia ??? phosphorus plant)

UP Dry Valley Branch (NOT the private "Dry Valley RR")
MP 0.0 EPCO (jct with UP Conda Branch)
MP 11.7 Wooley Valley (spur)
MP 18.4 Dry Valley (junction with private/mothballed "Dry Valley Railroad")

Mileposts came from a copy of the 1983 UP timetable with notes by me. There are lots of derails on the Conda Branch, one or two leaving Conda yard, and at least one more on the main track before Soda Springs (still there 2012 visit).

Not sure if Monsanto is still the owner of the phosphorus plant at their namesake station, but there is a plant located on the west side of the highway with a lead to them crossing the highway. Their private heavy haul road is east of the highway (conveyor under the highway) as is the branch main. Conda is a short ways off the highway to the east (easily visible and reasonably accessible), as far as I know they are still an Agrium owned plant as they were in 2005.

North of Conda there is a paved road that takes off to the east that follows the Dry Valley Branch. At Wooley Valley a long spur takes off to a phosphate reload (mine another few miles beyond), but it is NOT visible from the public road and as I recall you have to enter mine property before it becomes visible. The paved road ends at Dry Valley station, and years earlier I wandered down the dirt road that mostly parallels most of the private "Dry Valley RR". There was not a soul around all the way to the end of the line, and only part of the loading machinery and a derelict large building existed. Definitely not somewhere to break down.

Around 2005 Agrium closed their Wooley Valley reload and cleaned everything up but left the track and loader intact. They relocated operations to the Dry Valley station where an earlier phosphate mine had suspended operations (owner?). The open pit was in sight of the loader, so it was a very short haul to the reload where "Buster" (the xB&AP/Rarus GP7 from the Silver Bow plant and then Wooley Valley reload) was loading cars for the UP local to take to the Conda plant. Agrium's plan at the time was to mine out their phosphate claim adjacent to the UP Dry Valley station, then relocate back to Wolley Valley and reopen the mine north of there. BTW - their contract mining contractor in 2005 was the Washington Corp, same as the owner of MRL. (I think Dennis Washington ended up with M-K's mining and construction group when they imploded, so they may have held the original contract.)

I don't recall how long the private "Dry Valley" was, but I'm thinking close to 20. They interchanged at the UP Dry Valley station, then UP would have taken their ore 18+ miles to the junction at EPCO, then on to their plant (at Monsanto station?). All told, around a 40 mile haul each direction?

It's been a few years since I have been up to Dry Valley - You have to make the effort to be go there on purpose, so things may have changed.