A fire official says the firefighters were taken to a hospital for treatment but not seriously hurt when the collision occurred late Monday morning.
A fire engine was descending an exit ramp when it struck a ladder truck while both were en route to a structure fire. There was also a related report of an electrocution.
Fire Chief Charles Hood tells the San Antonio Express-News that it's not clear whether rainy conditions contributed to the accident.
The trucks will be inspected to assess the extent of the damage.
Reserve firefighters will be called to replace the two injured ones.