There are 4 public launch ramps on San Diego Bay.  Most are accessible during daylight hours with overnight parking for both your vehicle and trailer.  They all have nearby restroom facilities, picnic areas and telephones.

The Shelter Island Boat Ramp is the closest ramp to the open seas which is about 3 miles away and is located on the channel side of Shelter Island.  The ramp has 10 concrete lanes and the parking lot is huge.  Rest rooms are located on the site.  There are bait barges nearby and they are open 24 hours a day. 

The Boat Ramp on Coronado is located in  Glorietta Bay.  Check your nav chart for  the shallows outside of the Glorietta Bay and stay inside the marked channel. Inside the bay, the speed limit is 5 miles per hour.

The Chula Vista Boat Ramp is at the "J" Street Marina Park.   There is ample trailer parking, picnic facilities and restrooms.  Remember, this part of the bay is mostly shallows.   Check your nav chart and stay within the marked channels

The Boat Ramp in National City is next to Pepper Park and feeds off of the  Sweetwater Channel. Take the 24th Street from the 5 off.  There are also  restrooms, picnic facilities, trailer parking and a fishing pier at the park.