According to the latest information available from the Wisconsin Department of Natural Resources, the boat ramp named Mukwonago River - Lower Phantom Lake -- Access is a concrete ramp located on the Mukwonago River, which flows into Lower Phantom Lake. The boat ramp is approximately 12 feet wide and is suitable for small to medium-sized boats.

The body of water that the boat ramp services is Lower Phantom Lake, which is located in Waukesha County in southeastern Wisconsin. Lower Phantom Lake is a 118-acre lake that is approximately 25 feet deep at its deepest point. The lake is known for its clear water and good fishing opportunities, including largemouth bass, northern pike, and panfish.

In terms of the types of craft permitted on the water, there are no specific restrictions listed for Lower Phantom Lake. However, boaters are reminded to follow all state and local regulations, including having the proper safety equipment on board, obeying speed limits, and avoiding areas designated as no-wake zones.

Overall, the Mukwonago River - Lower Phantom Lake -- Access boat ramp is a convenient and accessible option for boaters looking to access Lower Phantom Lake in Wisconsin.