This bridge is just outside of the tiny town of Castle Rock. Castle rock is about 7 miles from Farmington, and about the same from Northfield.
Built in 1930, the bridge consists of trestle and I-Beam spans. These spans set on timber piles.
This type of bridge is common on America's railroads, and appears to remain in good condition.
The author has ranked this bridge as being locally significant, due to the common design.
The photo above is an overview. The bridge can be accessed from the road it crosses.