Unfortunately, there seems to be a discrepancy with the provided location coordinates. The coordinates given (latitude: 43.09978104, longitude: -90.77256012) place the boat ramp in Wisconsin, not Louisiana. Therefore, I cannot accurately discuss Bullhead Slough in Louisiana as there appears to be no such location.

However, in Wisconsin, there is a boat ramp named Bullhead Slough that is located on the Mississippi River. According to the Wisconsin Department of Natural Resources, the boat ramp is a concrete single-lane ramp that is approximately 14 feet wide. The Mississippi River is a large body of water that stretches across several states, and Bullhead Slough provides access to a portion of the river in southwestern Wisconsin.

As for the types of watercraft permitted on the Mississippi River, it can vary depending on the location and regulations set by local authorities. However, in general, the Mississippi River is open to a variety of watercraft, including motorized boats, kayaks, canoes, and other non-motorized vessels. It's important to note that each state may have its own rules and regulations, so it's best to check with the local authorities before launching any watercraft.

In summary, Bullhead Slough is a concrete single-lane boat ramp located on the Mississippi River in Wisconsin. It is approximately 14 feet wide and provides access to the river for a variety of watercraft.