The
Knik River is a 25-mile-long (40 km) river in the
U.S. state of
Alaska. Its source is at
Knik Glacier, from which it flows northwest and west and empties into the head of
Cook Inlet's Knik Arm, near the mouth of the
Matanuska River. It is bridged twice (old and new bridges) where the Old Glenn Highway crosses it near the Butte, and also bridged on the Hayflats.