McMillen

What McMillen does

McMillen Inc. is a private environmental engineering and restoration firm specializing in large-scale dam removal and river restoration projects. The company's flagship engagement is the Klamath River Renewal Project — described as the world's largest dam removal and river restoration effort — spanning Klamath Falls, Oregon and Hornbrook, California, which has reopened over 400 miles of habitat for native salmonid populations and reconnected tributaries for the first time in over a century. The firm operates as a corporation incorporated in Idaho with operational headquarters at 155 East 56th Street, New York, and a headcount of 11-50 employees, serving government agencies and indigenous tribal communities as its sole identified customer segment.

The business model is professional services revenue from large-scale environmental engineering contracts. Capital structure includes a December 2022 SEC Form D filing for an exempt securities offering of $6,361,667, with a minimum investment of $459 tied to an exchange transaction; use of proceeds was not disclosed. The firm reaches customers primarily through direct engagement with government agencies and tribal authorities, supplemented by a minimal digital presence (a website under construction and an active Instagram account for project updates). McMillen earned the American Council of Engineering Companies' (ACEC) Grand Conceptor Award, the engineering industry's top honor, for the Klamath project.

Core delivery relies on coordination of multi-stakeholder consortia — including 40+ partner organizations and indigenous tribal collaborators — for habitat restoration, floodplain recovery, and ecological monitoring across multi-jurisdictional projects. No proprietary technology platform, AI/ML capabilities, patents, software products, or mobile applications are disclosed in the available source material.

Name

McMillen

Legal name

McMillen, Inc.

Website

https://mcmilleninc.com

Company type

Private

Founded year

1924

Operating status

Operating

Headcount range

11–50 employees

Short description

McMillen Inc. is a private environmental engineering firm specializing in large-scale dam removal and river restoration, serving government agencies and indigenous tribes on complex ecological restoration projects such as the Klamath River Renewal.

Ownership category

akta.pro rank

Product category

Environmental Engineering Services

NAICS

Remediation Services (562910)

SIC

Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Hydropower Decommissioning, Dam Removal & Site Restoration (EUAMADAL)

Keywords

• Environmental engineering services
• Dam removal projects
• River restoration services
• Ecological restoration consulting
• Floodplain restoration services

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Others

Revenue model

1. Engineering Services and Restoration Projects: Revenue generated from large-scale environmental engineering projects, including dam removal and river restoration. The company secured $6,361,667 in exempt securities offering indicating capital raise for operations or project financing.

Pricing tiers

Distribution channels1 record

Marketing channels1 record

Core offering

McMillen, Inc. is an environmental engineering firm that plans and executes large-scale dam removal and river restoration projects for government agencies, tribal authorities, and environmental organizations. Its work focuses on ecological restoration, including dam deconstruction, habitat reconnection, floodplain recovery, and revival of native salmonid populations. The Klamath River Renewal Project—spanning Klamath Falls, Oregon and Hornbrook, California—represents the world's largest dam removal and the firm's flagship engagement.

Product overview

McMillen Inc. is an environmental engineering firm that specializes in large-scale dam removal and river restoration projects. The company's core service offering centers on ecological restoration initiatives, with the Klamath River Renewal Project being their flagship project representing the world's largest dam removal effort.

Differentiator

Problem solved

Functional benefit

Products and services

• Klamath River Renewal Project World's largest dam removal and river restoration project spanning Klamath Falls, Oregon and Hornbrook, California. Reopened over 400 miles of habitat and reconnected tributaries for native salmonid populations for the first time in over a century, executed in collaboration with indigenous tribes and more than 40 partner organizations.

Quantifiable outcome

• Reopened over 400 miles of habitat for native species
• +2 more outcomes

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Two partnerships are on record, tiered flagship and core.

• Indigenous TribesflagshipStrategic or Co-development Partner · 6 May 2026McMillen partnered with indigenous tribes as a core collaborative partner in the Klamath River Renewal Project, working together on dam removal and river restoration efforts that reconnected tribal lands and restored native salmonid populations for the first time in over a century.
• 40+ Partner OrganizationscoreStrategic or Co-development PartnerMcMillen led a consortium of over 40 partner organizations in executing the Klamath River Renewal Project, the world's largest dam removal initiative. Partners contributed to habitat restoration, floodplain recovery, and ecological monitoring across Oregon and California.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Direct peers

• Kleinschmidt Group: Engineering and science consulting firm specializing in hydropower, fish passage, and aquatic ecosystem restoration. Directly comparable to McMillen on dam-related environmental engineering and river-restoration project delivery for utilities and government clients.
• Resource Environmental Solutions (RES): Largest U.S. ecological-restoration firm delivering large-scale stream, river, and wetland restoration, including dam removal. Closely aligned with McMillen in mission, customer base (government/tribal), and project-based delivery model.
• Wildlands Engineering: Specialized ecological restoration and stream/stabilization engineering firm executing mitigation and river-restoration projects, often as a subcontractor on federal/tribal work. Comparable in size and specialty fit to McMillen.

Emerging players

• Trout Unlimited: Coldwater conservation organization that funds and executes river and salmonid habitat restoration projects, including dam removal advocacy and on-the-ground engineering. Comparable as a restoration project partner/operator in the same geography and species focus.
• American Rivers: National river-conservation organization driving dam-removal programs and river-restoration policy. Comparable as a programmatic counterpart in the U.S. dam-removal pipeline that McMillen helps deliver.
• Brown and Caldwell: Environmental engineering and consulting firm focused on water, ecosystem restoration, and infrastructure for municipal/federal clients. Comparable in environmental engineering delivery and customer profile, with some overlap on stream/river restoration.

Broad incumbents

• Stantec: Global engineering consultancy with a major environmental services and water practice. Comparable as a broad incumbent competing for the same government/tribal environmental and dam-related engineering work, though at much larger scale.
• AECOM: Global infrastructure consulting firm with extensive environment and water practices that pursue federal dam and restoration programs. Overlaps with McMillen in target customers and project types but competes as a large diversified incumbent.
• Jacobs: Large engineering and program management firm with deep federal water, environment, and infrastructure practices. Comparable in delivering federally funded environmental and dam-related megaprojects, but at much greater scale and breadth.
• HDR Inc. Employee-owned engineering firm with strong water, environmental, and hydropower practices that bid on dam and restoration programs. Comparable for federal/tribal environmental engineering work and project scale.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights5 records

Customer concentration

• Instagraminstagram.com/mcmilleninc
• Facebookfacebook.com/profile.php

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds1 record

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about McMillen