Featured Projects

Our integrated teams innovate and collaborate. See some examples of our work.

Port Orchard Stormwater Infrastructure and Sea Level Rise Analysis

Kent Parks Climate Resiliency and Sustainability Plan

Vancouver Sea2City Design Challenge

Shoreline Climate Impact and Resiliency Plan

Lawndale Southern Revitalization Project Feasibility Study

Jake Kuredjian Park Stormwater Project Feasibility Study

Merced Avenue Greenway Project Monitoring

County of San Diego Community-Focused Stormwater Program

State Parks Shoreline Vulnerability Assessment and Climate Adaptation

Boise Creek Golf Course Restoration Final Design

Seattle South Transfer Station Phase II Design Completion

City of Alhambra Green Street Feasibility Study

Cambie Corridor Integrated Water Management Plan

Wyoming AML Small Hard Rock Site Remediation

Shannon Point Shoreline Improvements

Pressentin Park Side Channel Restoration and Recreational Improvements

Puget Sound Shore Friendly Program Support

City of Kenmore Integrated Aquatic Vegetation Management Plan

Black Lake Algae Control Plan, Alum Treatments, and Septic Source Tracking

Silver Beach Creek Water Quality Retrofit

Hidden Lake Dam Removal

Pacific Lumber Stormwater Conveyance and Treatment

Leachate Pump Station Upgrades at Cedar Hills Regional Landfill

Troy Mine Revegetation Services

Swift Creek Sediment Management Action Plan Implementation

Lake Sammamish Snorkeling Survey

Lone Lake Management Plan

Julianna Park Improvements

Port Susan Bay Estuary Restoration

City of Seattle Stormwater Code & Manual Update

Still Harbor Shoreline Restoration Feasibility Study at McNeil Island

Port of Everett Stormwater Treatment Alternatives Analysis

Stateside Student Housing Development

Hawthorne Community STEAM Playground Retrofit

Port of Seattle’s Fishermen’s Terminal Redevelopment

Greywater and Rainwater Systems Design for BLOCKHouse: Homes for the Homeless

City of Marysville: Engineering for Olympic View Park Improvements

Westridge Place to Stoney Creek Way Trail Connector

Civil Engineering for Pasado’s Safe Haven Expansion

IC/ID Field Screening Guidance Manual and Training

King County Ditch Maintenance Toolkit

Municipal Construction Stormwater Site Inspection Toolkit

Incentivizing LID Beyond Permit Requirements Guidebook

Sun Canyon Road Resurfacing

Cottonwood Creek Wetland and Stream Delineations

Trophic Cascade Effects on Algae Blooms in Washington State

Black River Pump Station SEPA Strategy

Shirley Basin Uranium Waste Pile Reclamation

Vaughn Bay Microbial Source Tracking Study


Astoria Nordic Heritage Park

Ediz Hook Restoration

Mercer Island Decant Facility Retrofit

White River at Pacific Right Bank Flood Protection Project Planning and Design

Cornet Bay and Hoypus Point Improvements at Deception Pass State Park

Squalicum Creek Trail Cornwall Connector

Piner Point Shoreline Stabilization

Stillaguamish Village Design

Nearshore Restoration at Fort Townsend State Park

Dockton Beach Park Shoreline Restoration

Tacoma Climate Change Resiliency Study


Port Angeles Landfill Stabilization

Delridge Natural Drainage Solutions

Carli Creek Restoration and Stormwater Treatment Design

Black Pine Mine Reclamation


Cedar River Corridor Planning

Evaluating Establishment of a No Discharge Zone in Puget Sound

Vegetation and Wildlife Surveys for Bonneville Power I-5 Corridor

SR 167 Completion Habitat Mitigation and Stormwater Design

Cordata Trail to Elementary School

Albany Street Stormwater Facility

Evaluating Stormwater Retrofit and Restoration Opportunities in the Lower-Middle Deschutes River

Stormwater Program Support for Tumwater

Chicken Creek Refuge Restoration


D Avenue Green Street Stormwater Enhancement

Community Park at Cordata

Stormwater Infiltration and Impacts on Groundwater

LID Code Review and Implementation Tools

Bellevue Grand Connection

Lake Whatcom North Shore Water Quality Testing

Vancouver Watershed Health Assessment

Sunset Mine and Mill Reclamation

University CSO GSI Design Project

Upper Clear Creek Habitat Enhancement

Light Rail Construction Environmental Oversight

Seattle Center Campus Green Stormwater Retrofit

BMP Certification Services

Interbay Landfill Gas Extraction System

River Mine Reclamation

Retrofits to Reduce Phosphorus in Stormwater

Optimizing Bioretention Soil Media


Park Place Facility Design and POST Media Development

Port of Seattle Street Sweeping Effectiveness Study

Cedar Hills Landfill Development Alternatives

East Orchard Retrofit and Design

Tacoma Sustainable Materials Management Plan

Lake Whatcom Stormwater Capital Program

Colman Dock Sediment Cleanup Plan

Washington State Low Impact Development Training

Marymoor and Overlake Sustainable Redesign

Burnt Bridge Creek 2017 Trend Analysis

Big Cliff Remedial Investigation

Redmond Bioretention Research

Lower White River Countyline Levee Setback

Secret Harbor Salt Marsh Restoration

City of Roses Disposal and Recycling Upgrades


Holden Mine Remediation

Redmond Bioretention Monitoring

Chambers Lake Stormwater Treatment Facility

Zhenjiang Sponge City Infrastructure Planning

Sinnema Quaale Trail Protection and Habitat Enhancement

Hall Creek Culvert Removal and Restoration

City of San Francisco Typical Plans and Specifications for Green Stormwater Infrastructure

Coal Creek Parkway Culvert Replacement

WindFloat Pacific Offshore Wind Demonstration Project NEPA EA and Permitting


Green Lake Integrated Phosphorus Management Plan and Alum Treatment Design

Redmond Watershed Management Plan

Forest Rose Mine Reclamation


Pullen Creek Fish Passage and Restoration Design

City of Seattle Stormwater Code and Manual Update

Hillslope Delineation Toolbox and Batch Modeling

Canyon Ferry Shore Stabilization

The Bureau of Reclamation (BOR) has identified six sites along the shoreline of Canyon Ferry Reservoir near Helena, Montana with

Basin Planning for Agencies and Municipalities

Basin planning is inherently complex and uncertain. The interactions of physical, atmospheric, chemical, biological, climate, social, political, economic, and regulatory

Bacon Creek Quarry Restoration

The Bacon Creek Quarry restoration project is a component of the Seattle City Light Skagit River/Newhalem Second Tunnel Project, which

Aviation Stormwater Design Manual

To decrease wildlife-airplane interactions caused by stormwater facilities, the Federal Aviation Administration (FAA) and Washington State Department of Transportation (WSDOT)

Alaskan Way Viaduct / SR 99 Bored Tunnel Design-Build Project

Herrera is working as part of a team to provide design-build services to the Washington State Department of Transportation (WSDOT)