After conducting research, it appears that the boat ramp named Southwest 90th Avenue 4301-4349 in Bell, Florida is a concrete boat ramp. The width of the ramp is not specified in the available information.

This boat ramp services the Suwannee River, which is a popular destination for recreational boating and fishing. The Suwannee River is a large river that runs for 246 miles in northern Florida, and it flows into the Gulf of Mexico. The river is known for its clear water, scenic views, and abundant wildlife.

The kind of craft permitted on the water depends on the regulations set by the local authorities, however, typically, the Suwannee River permits a variety of watercraft, including motorized boats, canoes, kayaks, and stand-up paddleboards.

It is important to note that the accuracy of this information may be subject to change depending on local regulations and updates. It is recommended to verify this information with local authorities or reliable sources.