Below the Fish Fork the East Fork flows through the Narrows, one of the deepest gorges in Southern California. From the floor of the canyon at , Iron Mountain rises to the southeast, while Mount Hawkins, , rises to the northwest. The Iron Fork tributary joins from the west roughly in the middle of the Narrows. Near the lower end of the Narrows, the river passes under the Bridge to Nowhere, a high arch bridge that was abandoned after the huge flood of 1938 washed out a highway under construction along the East Fork. The bridge remains today as a popular destination for hikers and bungee jumpers.