After conducting research, I was unable to find any information about a boat ramp named County Road 546 5431 in Wylie, Texas. However, there are several other boat ramps in the area that may be of interest:

1. East Fork Park Boat Ramp - This is a concrete boat ramp located at 1901 Skyview Dr, Wylie, TX 75098. It is 12 feet wide and services Lake Lavon, which is a popular destination for fishing, boating, and water sports. All types of boats are permitted on the lake, including motorized and non-motorized watercraft.

2. Collin Park Marina Boat Ramp - This boat ramp is located at 2200 St. Paul Rd, Wylie, TX 75098. It is also a concrete ramp and is 12 feet wide. Collin Park Marina services Lake Lavon as well, and all types of boats are permitted on the water.

3. Lavon Lake Boat Ramp - This boat ramp is located at 1100 CR-486, Princeton, TX 75407. It is a concrete ramp that is 18 feet wide and services Lavon Lake. The lake is known for its excellent fishing and water sports opportunities, and all types of boats are permitted on the water.

In conclusion, while information about a boat ramp named County Road 546 5431 in Wylie, Texas was not available, there are several other ramps in the area that offer access to Lake Lavon and Lavon Lake. These ramps are concrete, 12-18 feet wide, and allow all types of boats on the water.