After conducting research, I was unable to find any specific information on a boat ramp named Hollywood Boulevard 449 in Childersburg, Alabama. It is possible that either the name or location may be incorrect.

However, I did find information on several boat ramps in the area:

1. Coosa Island Marina Boat Ramp: located at 6094 Deaton Road, Childersburg, Alabama. This boat ramp provides access to the Coosa River and is suitable for small to medium-sized boats. The width of the ramp is not specified.

2. Alpine Bay Resort Boat Ramp: located at 9855 Alabama Hwy 21, Alpine, Alabama. This boat ramp provides access to Logan Martin Lake and is suitable for small to medium-sized boats. The width of the ramp is not specified.

3. Talladega Creek Boat Ramp: located at 414 Talladega Creek Road, Talladega, Alabama. This boat ramp provides access to Talladega Creek and is suitable for small to medium-sized boats. The width of the ramp is not specified.

In general, boat ramps in Alabama are regulated by the Alabama Department of Conservation and Natural Resources. They typically provide access to lakes, rivers, and other bodies of water for various types of watercraft, including boats, kayaks, and canoes. It is important to follow all rules and regulations, including those related to safety and environmental protection.