Based on the available information, the boat ramp named East Airport Road Blackfoot in Idaho is a concrete boat ramp that provides access to the Snake River. It is approximately 20 feet wide and can accommodate small to medium-sized boats, such as fishing boats, pontoon boats, and jet skis.

The Snake River is a popular waterway for fishing and boating in Idaho, known for its scenic beauty and abundant wildlife. The river runs approximately 1,078 miles through parts of Wyoming, Idaho, Oregon, and Washington, and is home to various fish species, including rainbow trout, brown trout, and smallmouth bass.

As for the specific regulations related to watercrafts permitted on the Snake River at East Airport Road Blackfoot, it is essential to refer to the latest information provided by the Idaho Department of Fish and Game. Generally, motorized boats are allowed on the river, but certain sections may have speed or horsepower limits, and other rules and restrictions may apply. It is always recommended to check with local authorities or fishing and boating organizations to ensure compliance with all regulations and safety requirements.