Lincolnshire Police closed the A18 near Keelby after a lorry carrying 500 sheep overturned.
The Scania lorry from near York was bound for Skegness abattoir.
The vehicle lost control on a bend and toppled over, killing a number of sheep instantly and leading to a number of sheep being put down due to their injuries.
The remaining sheep were herded into a nearby field before being collected by another vehicle following the collision at around 4.45pm on July 29.
A quantity of diesel leaked from the vehicle which meant the road had to be closed.
A diversion was set up through Keelby.
The 35-year-old driver from Spilsby escaped with a minor leg injury and was treated at Diana, Princess of Wales Hospital, Grimsby.