Detailed Instructions: Generate a correct and concise answer for the question based on the words in the context.
Q: Context : The Hillsgrove Covered Bridge is a Burr arch truss covered bridge over Loyalsock Creek in Hillsgrove Township, Sullivan County, in the U.S. state of Pennsylvania. 
Question : What does Hillsgrove Covered Bridge cross over?
A:
Loyalsock Creek