Confusion Hill Realignment, Confusion Hill Bypass or South Fork Eel River Bridges) are a pair of high bridges carrying two lanes of U.S. Route 101 over the South Fork Eel River in Mendocino County in the U.S. state of California.

The bridges were constructed to reroute approximately 1.7 miles (2.7 km)[2] of the highway away from a massive landslide area on the south bank of the river.

Prior to the realignment this slide would shift during heavy rains, causing damage to the roadway and delays to traffic.

The bridges were designed by the California Department of Transportation (Caltrans), and the contractors were MCM Construction Inc. and the Finley Engineering Group.

The site is located at a bend in the South Fork Eel River that takes it from a north-flowing course to turn east, north and west.

[7] This new [south] bridge is a 3-span variable depth structure consisting of cast-in-place segmental concrete box girder.