OneFish Engineering, LLC

Designs systems that allow fish to migrate upstream past barriers such as dams and diversion structures, balancing water resource needs with aquatic habitat health. The engineering processes incorporate swimming capability analysis of target species, site hydraulics modeling, and collaboration with wildlife managers to design effective solutions.

• Technical Fishway Design

  Creates permanent engineered structures, such as vertical slot ladders, that establish well-defined hydraulics to enable fish to swim upstream through a series of pools.

• Nature-Like Fishway Design

  Develops bypass channels and rock ramps that reduce water velocity, allowing fish to swim around existing dams or diversion structures.

• In-Stream Rock Structures

  Engineers weirs and rock riffles that moderate downstream gradients, decreasing water velocities and elevation steps while maintaining upstream water levels.

• Dam Removal and River Restoration

  Removes unused barriers and restores natural channel conditions to reconnect river systems.

• Intentional Barrier Design

  Designs physical or hydraulic barriers to isolate stretches of river, protecting native fish populations from invasive species.

• Culvert Passage Systems

  Integrates vertical slot or modular metal ladders into existing culverts to facilitate upstream migration.

Prevents fish from entering diverted water systems, particularly irrigation canals, to minimize loss and improve overall fishery health. Solutions are tailored to diversion flow capacities and site conditions.

• Cone Screen Systems

  Designs cone-shaped fish screens to prevent entrainment at active water diversions.

• Rotating Drum Screens

  Engineers rotating drum screens designed to prevent fish entrainment while maintaining consistent diversion flows.

• Traveling Belt Screens

  Designs vertical traveling belt screens for high-capacity diversions to prevent fish from entering canals.

Performs complex water measurements and modeling in streams and irrigation canals to support water management and habitat conservation. Advanced instrumentation and signal processing are used to collect accurate velocity, depth, and flow data.

• Instream Flow Studies

  Conducts multi-month monitoring studies evaluating flow and temperature variations to assess habitat conditions and irrigation diversion impacts.

• Irrigation Efficiency Studies

  Measures water losses within canal networks to determine optimal targets for infrastructure improvements.

• Gauging Station Installation

  Installs permanent gauging stations equipped with real-time telemetry and remote web-based data access.

• River Mapping and Hydraulic Modeling

  Performs detailed three-dimensional mapping of river channels to generate high-resolution depth and velocity databases for restoration planning.