Two new outfall release structures, integral parts of the Juvenile Fish Bypass System Improvements at Bonneville Dam in Oregon, have been constructed in the Columbia River, approximately two miles downstream of the Bonneville Second Powerhouse. INCA Engineers provided the structural design for the outfall structures and engineering during construction services. The high and low outfall structures each extend approximately 400 feet into the river from the Washington shore and are designed to release juvenile salmon into the river at above-water discharge elevations for improved survival rates.

Project awards include Seattle Post SAME “1999 Design Excellence Award”; CECW Honor Award 2000; Washington Aggregates & Construction Associates “1999 Excellence in Construction Award”; Oregon Concrete & Aggregate Producers Association “1999 Excellence in Concrete Award”.

 Bonneville Juvenile Bypass System Multi-Level Outfalls Design (110.5 kB)

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