Unfortunately, it appears that there is some confusion regarding the boat ramp named Mississippi River - Sandy Hook Landing in Arkansas. The coordinates provided do not match any known location in the state.

There are several boat ramps along the Mississippi River in Arkansas, including in the cities of Helena-West Helena, Osceola, and West Memphis. However, without more specific information regarding the location of this particular ramp, it is difficult to provide accurate details about its width, permitted crafts, and the body of water it services.

In order to verify the accuracy of this information, it would be necessary to obtain more specific details about the location of the ramp, such as its address or the name of the nearest town. Alternatively, a search of official Arkansas state resources for information about boat ramps may yield more accurate information.