Based on the latest information available, the boat ramp named Plumas County in California is a concrete boat ramp which has a width of approximately 20 feet. This ramp is located at the latitude of 39.90493011 and longitude of -121.18583679.

This boat ramp provides access to the waters of the scenic Lake Almanor, which is a large freshwater lake situated in Plumas County. Lake Almanor is known for its crystal-clear waters and abundant fish species, which makes it a popular destination among anglers and boaters alike.

As for the types of craft permitted on the water, Lake Almanor allows for a wide range of watercraft to be launched from the Plumas County boat ramp. This includes boats, jet skis, canoes, kayaks, and paddleboards, among others. However, it is worth noting that certain restrictions may apply during certain times of the year, such as speed limits and no-wake zones.

In summary, the Plumas County boat ramp in California is a concrete boat ramp that services Lake Almanor. It is approximately 20 feet wide and allows for a variety of watercraft to be launched, subject to certain restrictions.