According to the latest information available online, the Heartland Trail Cass County boat ramp is located in Minnesota at coordinates 47.13481522 latitude and -94.62127686 longitude. It is a concrete boat ramp that appears to be well-maintained and suitable for launching a variety of watercraft.

The width of the ramp is not specifically listed, but it appears to be wide enough to accommodate most boats. There are also two docks adjacent to the ramp, which can be used for loading and unloading passengers or gear.

The boat ramp provides access to the Crow Wing River, which runs through central Minnesota and is a popular spot for recreational boating and fishing. The river is known for its scenic beauty and abundant wildlife, including fish such as walleye, northern pike, and smallmouth bass.

As for the types of watercraft that are permitted on the Crow Wing River, it is likely that most boats are allowed as long as they comply with local regulations and safety requirements. However, it is always best to check with local authorities or park rangers for specific information about boating on the river.

Overall, the Heartland Trail Cass County boat ramp appears to be a well-maintained and convenient access point for boaters and anglers looking to explore the Crow Wing River in Minnesota.