During a May 22 meeting in Oxnard, California, Channel Islands Harbor director Michael Tripp uses photographic maps to illustrate how sand filling the channel from tides and storms requires regular maintenance work on the breakwater and entrance channel, and how the severe winter storms affected navigation. Listening to Tripp are Col. Julie Balten, right, U.S. Army Corps of Engineers Los Angeles District commander, and Steve Dwyer, LA District Navigation Branch chief.