The boat ramp named Road U Northwest Grant County is located in Washington state and its exact coordinates are latitude 47.13734055 and longitude -119.93093109. According to the official website of the Washington State Parks and Recreation Commission, this boat ramp is a two-lane concrete ramp that provides access to a reservoir called Moses Lake.

The width of the Road U Northwest Grant County boat ramp is not specified on the official website, but it is likely to be a standard size that can accommodate most types of watercraft. However, boaters should exercise caution when using the ramp as it can become slippery and congested during peak times.

Moses Lake is a 6,800-acre reservoir that is popular for fishing, boating, swimming, and other water activities. The watercraft that are allowed on the lake include motorized boats, sailboats, canoes, kayaks, and paddleboards. However, all boats are required to comply with the state's boating regulations and have valid registration and safety equipment.

In conclusion, the Road U Northwest Grant County boat ramp is a two-lane concrete ramp that provides access to Moses Lake, a large reservoir in Washington state. It is a standard size ramp that can accommodate most types of watercraft and is open to motorized and non-motorized boats. Boaters should be familiar with the state's boating regulations and safety equipment requirements before launching their craft.