The present invention relates to dredgers for clearing yachting harbours. This dredger consists of a platform 1 set up on two floats 2 with, at the rear, movable anchoring piles 6 and, outside the perimeter of the platform, a submerged boom 6 provided, at its end, with the dredging tools; this boom 9 is connected to a vertical pole 10 guided in translation and in rotation in a frame arranged at the front of the platform 1 and anchored, in the working position, on the sea bed. The frame consists of a vertical support 20 provided with two horizontal cradles 22, 23 comprising the means for controlling and guiding the pole in translation and in rotation. The pipe for discharging the material comprises a rigid section 15 secured, at one of its ends, to a carriage 18 which can move in translation in a rail 19 arranged under the platform 1, the other end of the rigid section 15 being connected, by a flexible pipe section 16, at the level of the lower part of the pole, to the pipe for discharging the boom material. IMAGE
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