• Water storage

    Water storage

    As we enter our sixth year of drought, SHN engineers and geologists assist clients needing water storage.
  • Groundwater sustainability

    Groundwater sustainability

    SHN geologists are assisting Humboldt County in evaluating the sustainability of the Eel River Valley Groundwater Basin.
  • Trenchless technologies

    Trenchless technologies

    Using horizontal directional drilling, SHN installed an underwater power cable in Gig Harbor, Washington.
  • Environmental protection

    Environmental protection

    New wastewater collection and interceptor pipes, and a new pump station, eliminated sewage overflows into aquatic habitats.
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  • Community engagement

    Community engagement

    SHN, the Redwood Community Action Agency, and the City of Arcata organized a walkability assessment.

The Latest from SHN


Mendocino College Foundation Gala Raises over $110,000

Mendocino County’s best food, wine, beer, champagne, and gifts were showcased at the Mendocino College Foundation’s Annual Gala on October 1st, which raised over $110,000 for the Foundation.  SHN supported the event by donations of both money and time; SHN Willits Principal and Regional Manager Tom Herman sits on the Board of Directors and is currently Chair of the Land Committee, which manages, maintains, oversees and makes recommendations to the Board involving the disposition of real property.  Tom has been an active Board member for 15 years, representing the Willits area of residence.

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UAVs + 40 years surveying experience = 9 Siskiyou landfills surveys

Thanks Siskiyou County, for selecting SHN to survey nine remote landfills using unmanned aerial vehicles (UAVs) and the latest image processing technology, along with typical surveying instruments such as total stations and GPS.  Surveying and mapping using UAVs is proving to be cost-competitive with traditional surveying techniques.  “Point cloud density” generated by photogrammetric methods can provide higher definition than standard grid and conventional survey methods, and UAVs are often more cost effective than manned airplanes, because they are more flexible with respect to weather, and they can be flown at lower altitudes, producing higher resolution images.

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SHN tests 2,300 concrete samples for nuclear plant decommissioning

SHN collected and continues to test 2,300 concrete samples as part of the decommissioning of Unit 3 at PG&E's Humboldt Bay Power Plant. The decommissioning requires a way to access the non-operating nuclear reactor caisson for decontamination, demolition, and removal. However, any deep hole along the bay will quickly fill with groundwater unless an underground wall can be constructed that keeps the water out. PG&E contractors (including CB&I, DrillTech Drilling and Shoring, SHN, and many others) recently completed this circular underground wall.

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Flex-time allows SHN staff to assist in public engagement for Community Choice Aggregation

As Vice President of the Redwood Coast Energy Authority’s Board of Directors, Sheri Woo is working to increase public engagement as Humboldt County moves toward establishing a Community Choice Aggregation (CCA) program.  A CCA is a program that allows residents to choose the source of their electricity, either from the publicly owned utility or the CCA. 

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From Our Blog All Blog Posts

Memo to Millennial Engineering Students

Memo to Millennial Engineering Students

Welcome back to another nose-to-the-grindstone semester/quarter!  We salute your extreme work ethic, and your ability to keep focused on the goal of graduating and working to make the world a better place.  Here are some things to think about when you’re waiting for that numeric modeling program to run.

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What's New in Poo?

What's New in Poo?

Is poop the latest renewable energy resource, to be included in energy portfolios along with wind, solar, and hydro? A Seattle company has designed a system that uses sewage sludge as an input, and produces clean water, electricity, and ash as outputs.

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Join Our TEAM

Looking for a change in the right direction?

A career is an individual’s journey of learning and work, and whether SHN is a quick side-trip or a long and rewarding segment depends on the similarities of our future paths.  SHN’s path is one that values enhancing our communities and creating a rewarding environment for employees and shareholders.  We value team work, life-long learning, and family, health and work balance.

View All Open Positions


Featured Projects

  • Martin Slough Sewage Collection System Upgrade, Eureka, CA
    Civil Engineering

    Martin Slough Sewage Collection System Upgrade, Eureka, CA

    SHN’s redesign of the sewer system eliminated overflows to Martin Slough, saved the City and taxpayers $2.8 million in construction costs, and decreased future energy use by eliminating 13 pumping stations.

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  • Seismic Hazard Evaluation at an Operating Hydroelectric Dam

    Seismic Hazard Evaluation at an Operating Hydroelectric Dam

    SHN geologists investigated a known fault system to determine potential seismic hazards to the dam.  Trenchscan technology was used to record images that were later digitally merged to create a single image of the entire trenched area.

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  • Biological Monitoring for Willits Highway 101 Bypass Construction
    Biological Sciences

    Biological Monitoring for Willits Highway 101 Bypass Construction

    Beginning in 2012, SHN’s Biologist of Record managed a crew of 30 biologists that identified nesting locations of birds, prepared  and implemented salmonid relocation and dewatering plans, conducted Northern Spotted Owl surveys, and prepared daily and quarterly reports documenting the interactions between construction activities and regulated biological resources.

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  • “Hazmat” Investigation and Remediation at 46 CAL FIRE sites
    Environmental Services

    “Hazmat” Investigation and Remediation at 46 CAL FIRE sites

    Since 1995, SHN has performed environmental site investigation, hydrology studies, surveys, permitting, remediation design, and infrastructure evaluation and repair designs at 46 sites for CAL FIRE, the California state agency for real estate services (DGS-RESD), and the Division of the State Architect. 

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  • Low Impact Development of Grace Hudson Museum and Sun House
    Water Resources

    Low Impact Development of Grace Hudson Museum and Sun House

    With Ann Baker Landscape Architecture, SHN assisted in the design of the Museum’s new outdoor nature education facility, incorporating stormwater wetlands and bioretention areas, and encouraging groundwater recharge with infiltration trenches and permeable pavements.

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  • Materials Testing and Special Inspections at Frank R. Howard Hospital
    Materials Testing

    Materials Testing and Special Inspections at Frank R. Howard Hospital

    SHN’s field and laboratory efforts were observed and approved by inspectors from the Office of Statewide Health Planning and Development (OSHPD), the agency that ensures safe healthcare facilities.

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    Peninsula Light Company in Gig Harbor, WA thanks SHN

    “The Peninsula Light Company and its members will continue to benefit from your efforts long into the future due to the project’s sustainability. On my part, I would like to express my congratulation and gratitude for the professionalism, effort, and persistence you exhibited during the execution of this challenging HDD project. I would be proud to work alongside any of your crew members and staff that brought success to this project.”

    — Dennis P. Walden, P.E.
    Peninsula Light Company

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