Abstract: The present invention pertains to debris exclusion devices designed for use on a small augerhead type hydraulic dredge system for operations in debris laden channels that can cause the system's pump to malfunction. Debris to be excluded by these devices include portions of trees, woody-stemmed plants, pieces of lumber, pieces of metal or even unexploded ordinance. A first embodiment comprises vertical grates with curved front surfaces mounted in front of a spoils inlet of a dredgehead shroud with cooperating cutter assembly attached to the auger. These grates are spaced to allow passage of spoils and small debris, but not larger injurious debris that is detrimental to the system's pump. A second embodiment is a tapered transition box device attached to the augerhead's shroud disposed between the grates of a spoils inlet leading through these grates and a hose feeding the system's pump. The box is a clean-out device which is self-regulated and also maintains smooth transitional flow to the system's pump.