Fish Passage

Goldsboro Dam

Princeton Hydro was contracted to develop and analyze alternatives for the removal or reconfiguration of the Goldsboro Dam that maintained existing water supply capability while restoring fish habitat and reestablishing access for migratory fish. The primary project constraint was determined by the existing water supply intake configuration, pumping infrastructure, and water withdrawal demand for the dam on the Little River which acts as a backup water supply system for the City of Goldsboro. The Water Treatment Plant required a maximum rate of 9 million gallons per day to supply its water demand. The project team included water supply experts to determine requirements for the water intake and pumping system, and utilized hydrologic and hydraulic modeling to assess the viability of various conceptual dam removal and reconfiguration alternatives.

Flowing alternatives were investigated to provide improved fish passage while maintaining the full use of City’s backup water supply intake: full dam removal, installation of a rock ramp fishway, installation of an Obermeyer inflatable/gated spillway, installation of a bottom-hinged gate with cable hoists, or installation of a stop log spillway.

All alternatives were found to be feasible from engineering and cost perspectives to provide fish passage while maintaining the City’s water supply demand. Numerous presentations were made to the City of Goldsboro and the water treatment plant staff regarding the alternative approaches. Through these meetings it was determined that maintaining the dam and constructing a rock ramp fishway was the City’s preferred alternative. Princeton Hydro then developed preliminary design plans for the rock ramp fishway.