A laboratory experiment in a 180 degree curved flume with a mobile bed and suspended sediment transport is reported. The flow is steady. The bed topography is measured by means of a profile indicator. Free and forced alternating bars are present. The steady part of the bed topography, which is forced by curvature, is characterized by a below critical response of the transverse bed slope. Downstream of the bend entrance overdeepening occurs, this is weakly repeated further downstream, at these location the transverse bed slope is maximal. Further downstream the transverse bed slope decreases and converges to an approximately constant slope (constant in main flow direction). Suspended sediment concentrations are measured.