Based on available information, Sardine Lake Road 990 boat ramp is located in Sierra City, California, and provides access to Sardine Lake. It is primarily a concrete boat ramp that is suitable for use by small to medium-sized boats.

As for the width of the boat ramp, the exact dimensions are not readily available, but it is generally believed to be wide enough to accommodate most boats. However, it is worth noting that the ramp may be more challenging to navigate during periods of high water levels.

In terms of the body of water that Sardine Lake Road 990 boat ramp services, it is connected to Sardine Lake, a popular recreational destination in the Sierra Nevada Mountains. Sardine Lake is known for its clear blue waters, excellent fishing opportunities, and beautiful mountain scenery.

As for the kind of craft that are permitted on the water, Sardine Lake is open to a variety of different boat types, including canoes, kayaks, rowboats, and motorized boats. However, it is important to note that there are some restrictions on boat size and motor horsepower, so visitors should check with local authorities before launching their boats.

Overall, Sardine Lake Road 990 boat ramp is a popular destination for those looking to spend time on the water in the Sierra Nevada Mountains. Whether you're fishing, exploring the lake by boat, or simply enjoying the beautiful scenery, it is a great place to spend a day or two in the great outdoors.