From the record
“The Slate Creek Bridge is a riveted steel Parker pony truss bridge spanning the Blue River 9 miles (14.5 km) north of Silverthorne, Colorado. It is named after the road it carries, Slate Creek Road.”
Wikipedia article Slate Creek Bridge, CC BY-SA 4.0.
One of 8 National Register listings published here for Summit County · listed in 1985 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service