According to the official website of Iowa Department of Natural Resources, the F Avenue 9777 boat ramp is located on the Iowa River in Louisa County. It is described as a concrete boat ramp with a width of 18 feet.

The boat ramp provides access to the Iowa River, which is a popular destination for boating, fishing, and other water activities. The Iowa River flows through Louisa County and is known for its scenic beauty, diverse wildlife, and recreational opportunities.

As for the types of watercraft permitted on the Iowa River, the Iowa Department of Natural Resources states that "all types of boats are permitted on the Iowa River as long as they do not exceed the maximum length, width, and horsepower limits designated for each section of the river." These limits vary depending on the location and the conditions of the river, so it is important to check the latest regulations before launching any watercraft.

In summary, the F Avenue 9777 boat ramp in Louisa County, Iowa, is a concrete ramp that provides access to the Iowa River. It is 18 feet wide and allows various types of watercraft as long as they comply with the maximum size and horsepower limits set by the Iowa Department of Natural Resources.