Some Montana Highway Patrol troopers got to play cowboy on Wednesday - rounding up stray cattle.
A semi truck hauling the cattle overturned just after 1 p.m.
It happened on southbound I-15 at the I-90 junction. No other vehicles were involved in the crash.
The MHP says that speed was a factor and the driver lost control of the truck on the sharp curve at the interchange.
The driver was not injured in the crash.
The truck was hauling 37 cows.
One cow was euthanized at the scene due to severe injuries; all the other animals survived.