An oxbow lake, like the crescent shaped lakes that can be seen in the previous article, is created over a long period of time as soil erosion and deposition change the course of the river. During the deposition/erosion process, water flowing around a curved meander of the river moves faster around the outside of the curve, and slower around the inside. Suspended sediment is then deposited on the inside of the curves as the flow velocity decreases. You can clearly see this sediment deposition along the Baker River when looking at a recent aerial image and highlighting the areas in Surfer.
For the Baker River, the sediment is primarily sand and gravel since the river is so close to the steep White Mountains of New Hampshire. According to Boynton the sand and gravel that make up the soil create a safe area to walk along so long as the river level is low. A close up of one of these sediment areas and an aerial map of the areas can be seen below.