Based on the latest information I have available, the boat ramp named State Highway 78 305 in Ottertail, Minnesota is a concrete ramp that is considered to be in good condition. It is approximately 15 feet wide, which makes it suitable for launching most types of boats, including those with trailers.

This particular boat ramp services Otter Tail Lake, which is a popular recreational destination in the area. Otter Tail Lake is a large body of water that covers over 14,000 acres, and is known for its excellent fishing, boating, and other water-based activities.

According to the Minnesota Department of Natural Resources, the following types of watercraft are permitted on Otter Tail Lake:

- Motorized boats
- Non-motorized boats (e.g. canoes, kayaks, paddleboards)
- Sailboats

It is worth noting that certain restrictions and regulations may apply to different types of watercraft on Otter Tail Lake, so it is important to check with local authorities or consult the latest information before launching any boats or watercraft on the lake.