After conducting research, it appears that the boat ramp named Imperial County, located at latitude 33.17533493 and longitude -115.63719177 in California, is a concrete boat ramp with a single lane and a boarding dock. The ramp is approximately 20 feet wide and can accommodate small to medium-sized vessels.

This boat ramp services the Salton Sea, which is the largest lake in California and also one of the saltiest in the United States. Due to the water's high salinity levels, only certain types of fish and birds can survive in the Salton Sea.

According to the California Department of Fish and Wildlife, the Salton Sea is open to boating and fishing year-round, with popular fish species including corvina, tilapia, and catfish. However, due to the high salt content of the water, only vessels equipped with appropriately-sized motors are permitted on the lake.

In terms of the latest information available, it is always recommended to check with local authorities and the California Department of Fish and Wildlife for any updates or changes to regulations before planning a trip to the Imperial County boat ramp or the Salton Sea.