The west channel of the ancient Deak Ferenc which was constructed in 1875 in Hungary was used for controlling the water amount and the east channel was used for the shipping. In the study, four geophysical nondestructive methods were used to this old channel which needs the restoration and reinforcement works. The high-frequency seismic and acoustic measurementswere carried out, the resistivity measurements werecarried out to map the resistivity distribution of the slab, theseismic direct wave method wasused to map the seismic velocities for understanding the stability conditions of the walls and the ground penetrating radar measurements werecarried out on the slab and on the walls. The results of integrated study showed us that voids, faults and cracks were detected and the inhomogeneous construction materials were used in the slab. The obtained results emerged that the usage of nondestructive geophysical methods is essential in all stages of restoration and reinforcement works, especially for the ancient structures.