2019
#1 - Absmeier Landscaping & Construction or PDF

2018
#1 - Nicholson Building Company & Excavating or PDF
#2 - Henderson Pit or PDF
#3 - Harrison Western Construction or PDF
#4 - Naranjo Civil Constructors or PDF

2017
#1 - Rocky Mountain Water Works
#2 - Zak Dirt
#3 - CW Construction
#4 - 1888 Industrial Services

2016
#1 - Sam Sisneros Operations
#2 - ACA Products
#3 - J-2 Contracting
#4 - NB Trenchless

2015
#1 - Nelson Pipeline Constructors
#2 - GTH Excavating
#3 - L&M Enterprises, Inc.
#4 - Blackeagle Energy Services

2014
#1 - American West Construction, LLC
#2 - Miller-HFI, LLC
#3 - Repair & Maintenance Contracts (RAMP)
#4 - Mechanical Systems, Inc.

2013
#1 - Iron Woman
#2 - Wells Trucking
#3 - Summers Construction
#4 - Lens's Excavating

2012
#1 - New Elk Coal Company
#2 - Oxford Recycling
#3 - A-1 Organics
#4 - Bestway Concrete & Aggregates

2011
#1 - Total Site Utilities
#2 - Iron & Metals, Inc.
#3 - MJB Landscaping & Construction
#4 - 53 Corporation

2010
#1 - Allied Recycled Aggregates
#2 - Front Range Excavating
#3 - Brannan Sand and Gravel
#4 - Aztec Construction

2009
#1 - RAMP & KOMTRAX
#2 - New Design Construction
#3 - Power Motive 50th Anniversary
#4 - 4 Quarters Excavation & Development

2008
#1 - Superior Contractors, Inc.
#2 - Loadout Services, Inc.
#3 - Anson Excavating & Pipe, Inc.
#4 - Worldwide Rental Services

2007
#1 - American Infrastructure, Inc
#2 - Highplains Excavating Inc.
#3 - Maybell Enterprises Inc.
#4 - Oxford Recycling, Inc.

2006
#1 - Lisbon Valley Mining Company
#2 - Native Excavating, Inc.
#3 - All Recycling, Inc.