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River and Coastal Services

Herrera’s river and coastal team is devoted to restoring rivers and coastal environments for future generations.

We provide innovative, environmentally sensitive solutions for protecting infrastructure and property and restoring habitat that exceed clients’ expectations. Our interdisciplinary staff addresses the complex issues related to river and coastal engineering and geomorphology, including detailed quantitative analysis and hydraulic modeling; biological assessments and restoration plans; plans, specifications, and cost estimates (PS&E); construction management; and long-term project monitoring.

Herrera’s expertise with rivers includes river reach analysis; delineation of channel migration zones; design of engineered logjams; bank stabilization; and investigation of sediment erosion, transport, and deposition. Our geomorphologists are experts in analyzing fluvial, coastal, and lacustrine environments.

Herrera’s expertise with coastal areas includes shore-drift direction analysis; longshore sediment transport studies; coastal erosion, sedimentation, and sediment budget studies; coastal geomorphology analysis, tidal prism modeling and analysis, inlet stability analysis, beach armoring impact assessment, and habitat restoration design. Our project experience includes coastal and tidal marsh geomorphology, hydrology and hydraulics; design and assessment of shoreline structures; underwater monitoring and inspections; and wave and boat wake analysis.

Key Rivers Projects

  • Hoh River Logjam Design and Construction Services at U.S. Highway 101 – WSDOT
  • Tualatin River Dike Stabilization Project – Clean Water Services
  • White River Bypass Reach Hydraulic and Geomorphic Analysis of Flow Diversion – Puyallup Tribe of Indians
  • Crooked River (Idaho) Instream Habitat Restoration and Improvement Design – USDA Forest Service
  • White River Reach Analysis and Emergency Response Action Plan for Route 410 – WSDOT
  • Mashel River Salmon Habitat Restoration – South Puget Sound Salmon Enhancement Group
  • Lower Tolt River Floodplain Reconnection Project – Seattle Public Utilities
  • Dungeness River Engineered Logjam Restoration – Jamestown S'Klallam Tribe
  • Design, Consultation, and Inspection of Three Engineered Logjams on the White River – Northwest Pipeline Corporation
  • South Fork Nooksack River / Lower Hutchinson Creek Geomorphic Assessment, Restoration Plan, and Design – Nooksack Indian Tribe

Key Coastal Projects

  • North Bay Natural Area Preserve Estuary Enhancement Project – WSDNR
  • Ala Spit Feasibility Assessment Project – Island County, WA
  • Rockaway Beach Shoreline Road Stabilization Study – City of Bainbridge Island
  • Tide Marsh Restoration for Lund's Gulch – Sound Transit
  • Beach Sediment Survey of Puget Sound Shoreline in Thurston County – Thurston County Regional Planning Council
  • Olympia Oyster Restoration and Priority Marine Habitat Stewardship Program – Jefferson County Marine Resources Committee

River and Coastal Services

  • Coastal Engineering Services

  • Design

  • Erosion and Sediment Control

  • Fish and Fisheries

  • Geomorphology and River Science

  • Hydrologic Analysis

  • Hydrologic and Hydraulic Modeling

  • Marine Biology

  • Natural Resources Mitigation and Restoration

  • River and Floodplain Restoration

  • River Engineering

  • Shorelines

  • Stream Restoration

  • Underwater Investigations and Engineering Inspections

  • Wildlife Habitat Evaluation and Management Services

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