The following report describes a cultural resource underwater reconnaissance of certain areas within and near the Mission Bay Harbor entrance channel, San Diego, California. This investigation, undertaken at the request of the U.S. Army Corps of Engineers, is in support of their proposed dredging and construction projects for this locality. The investigation was conducted in three phases: (1) literature, (2) magnetometer remote sensing survey, and (3) diver inspection survey. The magnetometer survey detected three objects of probable cultural origin within the survey area. One of these (Anomaly A) proved to be a modern construction resembling a flotation pontoon and has no cultural resource value. The two remaining anomalies are buried within the sediment blanket and remain of unknown cultural value.