There are no cables stretched across the river.
This is a correction to Rod Heikell's Italian Waters Pilot, 9th edition, 2015, p130. He says that there are cables stretched across the river about 500m from the entrance, suspending drop nets and restricting access to the river to yachts with an air draft greater than 18m. These cables no longer exist and therefore the only restriction at the entrance is one of draft going over the bar. The deeper water is on the north side of the entrance and I recorded a minimum depth of about 5m.