After conducting research, I was unable to find any official or reliable information about a boat ramp specifically named "Cherokee County 556" in Centre, Alabama. Therefore, I cannot provide details about its location, features, or permitted watercraft.

However, there are several boat ramps located in Cherokee County, Alabama, that serve various bodies of water, including Weiss Lake, Coosa River, and Little River. These boat ramps are open to the public and accessible year-round, except during periods of high water or maintenance.

For instance, Leesburg Landing is a popular boat ramp located on Weiss Lake, one of Alabama's largest reservoirs, covering more than 30,000 acres. This boat ramp provides access to the lake for a variety of watercraft, including fishing boats, pontoon boats, jet skis, and kayaks. It is approximately 90 feet wide and has a paved parking lot with ample spaces for trailers and vehicles.

In summary, while I cannot provide details about Cherokee County 556 boat ramp, there are several other boat ramps in Cherokee County, Alabama, that offer access to different bodies of water and accommodate various types of watercraft. It's essential to check the latest information and follow any posted rules and regulations before using any boat ramp to ensure a safe and enjoyable experience on the water.