Trihydro is an engineering and environmental consulting firm committed to providing effective solutions. We approach each project as an opportunity to partner with our clients and build trust based upon successful outcomes. With project experience extending back to 1984, our professional engineers, geologists, scientists, designers, and regulatory experts understand how to take a strategic vision, turn it into a practical plan or design, and move it through project delivery. 

Click to read more

Solutions you can count on

We offer comprehensive environmental services, engineering expertise, and technology solutions.
We focus on how each provided service factors into the bigger picture, so our solutions fully integrate into our clients' overall visions.

Our services

People you can trust

Trihydro has 500 people dedicated to service excellence. Our mid-size means
we have the expertise and manpower to provide project solutions, while still being small
enough to prioritize our individual clients' needs.

Our team

A cultural code

Trihydro's corporate code of conduct is based on a book titled Cowboy Ethics, What Wall Street Can Learn from the Code of the West by James P. Owen. The Code of the West has 10 tenets, and in 2017, Trihydro added one more: "Leave it better than you found it." Our cultural code underpins how we approach projects, relationships, and challenges.

code of the west

moving INDUSTRIES forward

The environmental and engineering services we provide benefit multiple industries. While the types of services we offer may be similar, each industry's challenges are unique. Trihydro is committed to understanding each specific client to develop specific, fit-for-purpose solutions. 


news & resources

Featured Projects

CalWood Fire Rehabilitation

Boulder County Parks and Open Space
Boulder County, CO


The CalWood Fire began on October 17, 2020, and burned approximately 10,112 acres of private, county, state, and federal land within Boulder County, Colorado. The fire left approximately 46% of the burn area with “moderate to high soil burn severity,” leading to post-fire flooding, debris flow, and erosion concerns. 

Trihydro Corporation and Na Ali’i Consulting & Sales, LLC supported Boulder County Parks and Open Space (BCPOS) in designing and constructing mitigation measures to capture potential debris and mudflows in areas impacted by the CalWood Fire. The project was funded primarily through the Natural Resources Conservation Service (NRCS) Emergency Watershed Protection (EWP) Program, with BCPOS entering into a cooperative agreement with the NRCS to provide emergency stabilization and infrastructure protection to areas most at-risk due to conditions created by the wildfire.

The initial phase of the work included reviewing existing pre- and post-fire datasets to identify data required to support analysis and modeling efforts. Identified data included remote sensing and satellite-based imagery, land cover and vegetation mapping, digital elevation models, historical streamflow and precipitation, and soils information. 

Prior to beginning the design process, the project team conducted a series of site assessments to evaluate mitigation measure types and locations. One objective included qualitatively validating results of the initial hazard assessment data review. The project team also performed an assessment to identify locations where detailed modeling was required to inform mitigation measure designs.

The team performed modeling analyses to yield the required design inputs at the appropriate spatial and temporal scales. The team used debris flow modeling results to evaluate mitigation alternatives and size the final designs. Passive and active mitigation measures were considered, which included open debris flow control structures (e.g., rock check dams, lateral walls, deflection walls, berms and barriers), closed control structures (e.g., debris racks, storage basins), and other sediment control structures (e.g., beaver dam analogs). NRCS reviewed and approved the final designs. In addition to the final plan set and specifications, the team developed an operations and maintenance plan, a temporary construction stormwater pollution control plan, and a final design report. The team also supported BCPOS with local and federal permitting processes. 

The team worked collaboratively with BCPOS and other stakeholders throughout the project. Based on client and stakeholder feedback, the team adapted initial designs to achieve multiple objectives (e.g., debris and sediment control, ecological and habitat needs, access and maintenance requirements). In addition, the team made design adjustments during construction to better match the natural terrain and maximize the use of on-site, native materials. In the lower Geer Creek watershed, the team designed and constructed a floodplain restoration area to reduce peak discharges and protect downstream infrastructure along Left Hand Canyon. Returning the area to its natural setting, including native wetlands vegetation, provides long-term hydrologic and wildlife benefits.  


  • Adaptive design that targeted small, strategically located debris/sediment control structures that blended into the natural environment
  • Eliminated the need for large, obtrusive, and more environmentally degrading structures downstream
  • New flash flood and debris flow control structures mitigate peak flows and help prevent the movement of harmful debris and sediment
  • 2022 American Public Works Association Colorado Award 
Back to All Projects

Interested in joining the Trihydro team? Learn more about what it's like to work at Trihydro.

our careers ›

Give us a visit.  We have offices all over the country. Drop by anytime.

our locations ›