The only NERO research site in Iron Butte, beside a helicopter wreck across a gap from the southern Iron Butte ambush camp. A Nitrous bike jump gets you across. It only opens once Iron Butte does, after the Rippers fall.
You get there with a bike jump off a ramp. Fit Nitrous and the best engine you can afford, then hit the ramp at full speed with boost. Save first, because a short jump means a long fall.
A NERO Injector and an intel recorder. Pick the boost you are shortest on: Health if you die to Hordes, Stamina for riding out fights, Focus for slow-mo aiming. NERO checkpoints hold injectors too, so check both on your map.
Black Mountain Ridge
Black Mountain Ridge is a spot in the Iron Butte valley with a historical marker about Iron Butte itself, an old volcano. Stop by if you are filling out the historical marker collection.
Cloverdale Research Iron Butte Facility
The Cloverdale Research Iron Butte Facility is a high-security private lab in Iron Butte, still powered two years after the outbreak. You only go here with Sarah for the story, so there is no open-world job to clear.
Iron Butte Ranch Horde
A 300-Swarmer Horde at Iron Butte Ranch that you clear in Keep Them Safe, part of the push toward Wizard Island. It is the only Horde you ever fight in Iron Butte, and it shows up just for this mission.
Redwood RV Park Ambush Camp
Redwood RV Park Ambush Camp is a Ripper camp in an old RV park in Iron Butte. It only opens with the region late in the story and pays 2,500 XP plus Iron Mike's Trust and credits.