HomeUSASouth DakotaCuster State ParkCathedral SpiresThunder RockThunder RockLAT,LNG 43.84736, -103.53333CREATED UPDATED Edit MapShareDescription[Edit]Thunder rock is the large independent spire located at the base of the spire 3 ridge. It hosts 3 fun adventure routes.1 ClimbsComing soon: New Climbs1Thunderbird5.9Trad