Unfortunately, there seems to be a confusion in the question as Bayou Benoit Levee Road is actually located in St. Martin Parish in Louisiana, not in Arkansas. Therefore, the information provided in the question is inaccurate.

According to the latest information available, the Bayou Benoit Levee Road boat ramp is a concrete ramp that provides access to Bayou Benoit, which is a navigable waterway that runs through St. Martin Parish. The ramp is wide enough to accommodate boats of various sizes, but the exact width is not specified.

As for the kinds of craft permitted on the water, Bayou Benoit is typically used for recreational boating, fishing, and wildlife watching. However, there may be specific regulations or limitations in place depending on the time of year or other factors, so it's important to check with local authorities for the latest information.

In summary, the Bayou Benoit Levee Road boat ramp in St. Martin Parish, Louisiana is a concrete ramp that provides access to Bayou Benoit for recreational boating, fishing, and wildlife watching. The exact width of the ramp is not specified, and there may be specific regulations or limitations on the kinds of craft permitted on the water.