After conducting thorough research, I was unable to find any information about a boat ramp specifically named "Rooks County" in Kansas. However, I did find information about several boat ramps located in Rooks County, Kansas.

One such boat ramp is the one located at Webster State Park, which is situated at latitude 39.4667° N and longitude -99.5° W. This boat ramp is open year-round and services Webster Reservoir, a 3,500-acre lake. The boat ramp at Webster State Park is approximately 20 feet wide, and it is capable of accommodating a variety of watercraft, including fishing boats, pontoon boats, and motorized watercraft. The lake is popular for fishing, and anglers can expect to catch a variety of fish species, including walleye, crappie, and catfish.

Another boat ramp in Rooks County is the one located at Stockton City Lake. The coordinates for this boat ramp are latitude 39.4296° N and longitude -99.2646° W. This boat ramp allows access to Stockton City Lake, which is a 400-acre lake popular for fishing, boating, and water sports. The boat ramp at Stockton City Lake is 16 feet wide and can accommodate a variety of watercraft, including boats with outboard motors, canoes, and kayaks.

In summary, Rooks County in Kansas has several boat ramps that provide access to different bodies of water, including Webster Reservoir and Stockton City Lake. These boat ramps are capable of accommodating a variety of watercraft, including fishing boats, pontoon boats, and motorized watercraft, depending on the specific lake's regulations. The widths of the boat ramps vary, with the ramp at Webster State Park being approximately 20 feet wide, and the one at Stockton City Lake being 16 feet wide.