A horizontally discharging momentum jet issued laden with sediment is investigated with laser-induced fluorescence and particle-imaging velocimetry. The two phases of solid and liquid are separated by applying two optical filters in front of the imaging camera. It is found that sediment concentrations under 0.1% do not affect the global properties of the jet flow. For higher sediment concentrations, the settling motions of sand particles are observed to drag the jet to spread with a downward-bending mean trajectory. Intensive particle-flow interaction is also observed for high concentrations of sand sediments in the jet, up to 0.77%.