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Expanding Service in Colorado

Horrocks Engineers began providing civil engineering and related services in Colorado in 2013. Since that time, our operations have grown to include 21 employees, tripling the staff in the last year alone.

A New Colorado Office

To keep up with the rapid growth in our Colorado operations, Horrocks has opened a second office location in Greeley to complement our initial Denver location. This office provides significant benefits by decreasing the commute time for some of our staff and allows Horrocks to better serve our northern Colorado clients with faster response times. The Greeley office is located at 4627 West 20th Street Road.

Horrocks’ Denver office also recently moved to a larger space to accommodate increasing staff numbers. The new location within the Triad Building Complex in Greenwood Village nearly doubles the space for our rapidly growing team.

An Experienced Team

The Horrocks team in Colorado includes experts with many years of experience in public works projects, including Horrocks’ Colorado Business Leader, John Holzwarth, and Colorado Director of Transportation and Operations, Johnny Olson.

John Holzwarth, PE, is an experienced business leader in infrastructure development and delivery with specific expertise in highways, bridges, airports, multi-modal, transit, and rail. John excels in team development, project management, and strategic planning. He has practiced civil/transportation engineering in Colorado for more than 17 years and has a detailed understanding of the Colorado Department of Transportation’s (CDOT’s) work approaches, project goals, and vision for the future.

After 28 years with the Colorado Department of Transportation (CDOT), former CDOT Deputy Director Johnny Olson, PE, brings a great depth of local experience to his Horrocks role as Colorado Director of Transportation and Operations. As CDOT Region Director, Johnny was recognized as one of CDOT’s top leaders, where he led approximately $800 million of projects from conception to construction completion. He has had unique experience managing projects, leading task forces, and building consensus among stakeholders. His expertise includes project management, transportation planning, highway design, construction management, and contract management. Johnny was also recently elected to serve as the President of Move Colorado, a private industry organization that provides information, sponsors education programs, and supports the efforts of Colorado community, business, and political leaders to solve transportation funding issues.

The Horrocks team in Colorado has grown significantly over the past few months. Most recently, our team added two new key hires: Micah Leadford and Tim Harris. Micah and Tim have both worked in the Colorado transportation industry for many years and bring a unique depth of experience to our project team.

Micah Leadford, PE | Senior Engineer

Micah joins us after 10 years with the Federal Highway Administration (FHWA) in the Central Federal Lands Highway Division. We are excited to share his extensive transportation experience and knowledge with our clients in Colorado.

Tim Harris, PE | Client Relationship Manager

Tim brings over 30 years of CDOT experience as well as 5 years of private sector experience. Tim is a recognized and respected industry veteran who brings over 40 years of experience leading transportation in Colorado, including over 33 years with Colorado DOT serving in various leadership roles such as the DOT Chief Engineer and Region 2 Regional Transportation Director (RTD).

The Colorado team also includes designers, engineers, and technicians specializing in roadway design, ITS systems, geographic information systems (GIS), bridge structures, fiber optics, CAD, and subsurface utility engineering (SUE).

Colorado Projects

The Horrocks Colorado team is working closely with multiple cities, counties, CDOT, and several private sector clients. Recent projects of note include:

CR 66 and CR 41 Intersection Design and Improvements

Horrocks is helping Weld County improve the mobility and safety of the CR 66 and CR 41 intersection in Greeley to accommodate increased volumes and truck movements. The planned improvements include adding left-turn lanes at each quadrant of the intersection, improving the vertical sight distance along the CR 41 approaches to the intersection, and developing cost-effective structural designs for the stream crossing on CR 41 west of the intersection. Horrocks is providing full SUE services to support the design development, hydraulics and hydrology, surveying and mapping, geotechnical investigations, environmental resource clearance, and full coordination assessment across all service areas

Douglas County On-Call SUE Services

Horrocks is providing SUE services through an on-call contract to support projects on an as-needed basis throughout Douglas County. Our team is currently performing SUE services to support the design development for the County Line Road and Inverness Parkway intersection reconfiguration; Lincoln Avenue, Havana Street, and Meridian Boulevard intersection; the County Line Road Widening project from University Boulevard to Broadway; and the C470 Trail over the Yosemite Street Pedestrian Bridge.

Weld County Non-Project Specific On-Call SUE Services

Johnny is the Principal-In-Charge and Project Manager on select projects on an as-needed basis throughout Weld County. Our team has completed or is currently providing SUE services on the following projects to support the design development of each intersection improvement project: CR 74 and CR 33, O Street and 35th Avenue, and CR 80 and CR 37.


As a full-service civil engineering and professional services firm, Horrocks coordinates all of the disciplines necessary to study, plan, and design infrastructure projects. Our Colorado operations provide the following services:

  • Program and Project Management

  • Roadway and Highway Design

  • Multi-modal Transportation Planning

  • Environmental Analysis and Permitting

  • GIS and Spatial Analysis

  • Traffic Engineering

  • Utility Infrastructure Design

  • SUE

  • Aviation Planning and Design

  • Construction Management

  • Survey and Right-of-Way (ROW)

  • Public and Community Involvement


Contact Us

For more information about the services available in the Colorado area, please contact John Holzwarth at or call 303-967-0353. For a full list of Horrocks’ services, please visit our website at


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