Kern Bridge or Yaeger Bridge crosses the Le Sueur River in Blue Earth County in the U.S. state of Minnesota. It was built in 1873 using a bowstring through truss design by the Wrought Iron Bridge Company. It is 183.5 feet (56 m) long and carries a local road. It was listed on the National Register of Historic Places in 1980 as Minnesota's only bowstring arch truss bridge and oldest road bridge still in use. However it was closed to vehicle traffic in 1991.