Manson Construction Co. derrick barge D.B. “NJORD” is a 55 cubic yard clamshell dredge with a walking spud.
Here she is doing channel clean-up in the Alameda Channel in the Oakland Inner Harbor.
The 55-cubic yard clamshell bucket looks really small in the video – the entire Njord is 146 feet long.
Dredging Today Staff, January 28, 2013