Based on the latest information available, the Branched Oak 4 boat ramp is located in the Branched Oak Lake State Recreation Area in Lancaster County, Nebraska. It provides access to Branched Oak Lake, which is a 1,800-acre reservoir that offers boating, fishing, and swimming opportunities.

The boat ramp at Branched Oak 4 is described as a concrete ramp and is reported to be wide enough for two boats to launch simultaneously. Additionally, the ramp is equipped with a courtesy dock for boaters to use while loading and unloading their vessels.

As for the types of watercraft permitted on Branched Oak Lake, the lake is open to a variety of vessels, including motorized boats, sailboats, kayaks, and canoes. However, there are some restrictions in place, and boaters are advised to check the park regulations before launching their watercraft.

Overall, the Branched Oak 4 boat ramp appears to be a well-maintained and accessible facility for boaters looking to explore the waters of Branched Oak Lake in Nebraska.