The trap, in accordance with the invention, is a portable, light, and comfortable to operate construction enabling performing measurements of the mass and volume of river bedload at the same sites and in the same time intervals adjusted to the discharge regime. Measurements with continuous, even 24h monitoring, can be performed irrespective of the environmental conditions of the catchment, and in extreme climatic conditions.;Incorporating single building blocks in the additional stabilizing-safety construction anchored strongly in the river banks allows for eliminating the effects of high-energy flood flow discharges, and collisions with drifting parts of trees or ice floats.;The River Bedload Trap is constructed of at least one building block equipped with a container (1) fastened to a body (4) together with a stabilizing frame, and fastened, by means of strings (8 and 9) and stainless snap hooks (10) to a steel rope (11) in PVC coating, stretched across the river channel, and anchored in the river banks by means of stakes (12) with a rope stay system.;The containers (1) are made of waterproof net strengthened on seams with waterproof belt, and assembled together with a clamp yoke (3), in a manner enabling its unfastening, on the metal body (4) to which also the stabilizing frame is fastened, resting on a pair of perforated brackets (2) anchored in the river channel bed, enabling screwing on a crosspiece (5) equipped with a vertical rifled rod (6) with a screwed on tighten bolt. The body is additionally equipped with a handle (7), made of waterproof belt, for pulling the container out.
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