Dredge and Endangered Species Observers monitor dredge transportation and disposal onboard tugs, towing scows, and hopper dredges. There are two certification processes related to these positions, Dredge Observer certification and Endangered Species Observer certification. A dredge observer is certified by the Army Corp of Engineers as being skilled in course plotting and able to update a dredge monitoring computer. Dredge Observers must pass a written test on navigation principles, then an onshore computer simulation test and finally a hands-on computer test onboard a dredging vessel.

Endangered Species Observers are certified by the National Marine Fisheries Service (NMFS) as capable of sighting and identifying marine mammals, sea turtles, and sturgeons. Certification is primarily based upon a person's training and experience. Applicants send their resumes and cover letters to NMFS, Northeast Regional Office in Gloucester, MA to receive certification.

When operating, a dredge vessel must have both a Dredge Observer and an Endangered Species Observer onboard . Therefore anyone certified as both a Dredge and Endangered Species Observer is preferred, otherwise two observers are required.