Tetra Tech INCA provided pre-bid and engineering during construction services to raise the height of the existing diversion dam, modify the intake structures, add a fish screen and fish ladder, and construct a fish sorting facility.

INCA’s designs for the fish passage facilities were coordinated with the new dam and intake, on the upstream end of the project, and with the fish trap and sort facility on the downstream end of the project. Subsequent work involved review of the construction documents to determine if revisions were necessary due to code changes or changes in component manufacturers and requirements for engineering during construction.