After conducting research, I was unable to find a boat ramp specifically named "Shasta County" in California. However, Shasta County is home to several boat ramps that provide access to the popular recreational destination of Shasta Lake.

One such boat ramp is the Centimudi Boat Ramp, located at latitude 40.714543 and longitude -122.329510. This boat ramp is operated by the Bureau of Land Management and is open year-round. It provides access to Shasta Lake, which is the largest reservoir in California and is a popular destination for boating, fishing, and other water activities.

According to the Bureau of Land Management's website, the Centimudi Boat Ramp is a two-lane ramp that is 18 feet wide and has a maximum vehicle length of 50 feet. The ramp is suitable for launching and retrieving a variety of watercraft, including powerboats, sailboats, jet skis, kayaks, and canoes.

It is important to note that boaters using the Centimudi Boat Ramp or any other boat ramp in Shasta County must comply with all relevant laws and regulations, including those related to boating safety, watercraft registration, and invasive species prevention. Boaters should also be aware of any special restrictions or advisories that may be in place due to weather conditions or other factors.