| Company | City | State | Phone |
| A.G. Wassenaar, Inc. | Denver | CO | 303-759-8100 |
| AECOM | Greenwood Village | CO | 303-740-2691 |
| Ascent Group, Inc. | Boulder | CO | 303-499-3022 |
| Bureau of Reclamation | Evergreen | CO | 253-208-5644 |
| Cantrell Engineering LLC | Denver | CO | 303-842-1296 |
| Carollo | Broomfield | CO | 303-635-1220 |
| CDS Engineering Corporation | Loveland | CO | 970-667-8010 |
| Cesare, Inc. | Centennial | CO | 303-220-0300 |
| Claybourn Engineering, Inc. | Lakewood | CO | 303-356-2312 |
| Coggins & Sons, Inc. | Littleton | CO | 303-791-9911 |
| Cole Garner Geotechnical | Westminster | CO | 303-996-2999 |
| Complete Engineering Services | Golden | CO | 303-279-6418 |
| CTC-Geotek, Inc. | Denver | CO | 303-698-1050 |
| CTL Thompson | Denver | CO | 303-825-0777 |
| CTL/Thompson, Inc. | Colorado Springs | CO | 719-528-8300 |
| CTL|Thompson Inc. | Fort Collins | CO | 970-206-9455 |
| D&B Engineering Contractors | Wheat Ridge | CO | 303 423-6834 |
| Earth Engineering Consultants, LLC | Windsor | CO | 970-545-3924 |
| Entech Engineering | Colorado Springs | CO | 719-531-5599 |
| Felten Group, Inc. | Centennial | CO | 602-867-2500 |
| FHWA-CFLD | Arvada | CO | 303-819-0372 |
| Geoff Webster, P.E. | Colorado Springs | CO | 719-548-0600 |
| GeoStabilization International | Grand Junction | CO | 970-644-1484 |
| Ground Engineering Consultants | Englewood | CO | 303-289-1989 |
| Hayes Consulting Company, LLC | Greenwood Village | CO | 303-455-5180 |
| Hepworth-Pawlak Geotechnical, Inc. | Glenwood Springs | CO | 970-945-7988 |
| Higgins & Associates, Inc. | Highlands Ranch | CO | 303-972-4300 |
| Hildenbrandt and Associates, Inc. | Colorado Springs | CO | 719-535-9894 |
| HP Geotechnical, Inc. | Parker | CO | 303-841-7119 |
| Jesik Consulting | Pueblo | CO | 719- 582-5588 |
| KC Hamilton Engineering | Denver | CO | 720-261-9358 |
| Kiewit Infrastructure Engineers | Englewood | CO | 303-269-3167 |
| Kleinfelder, Inc. | Colorado Springs | CO | 719 632-3593 |
| Kordziel Engineering | Golden | CO | 303-216-1919 |
| Kumar & Assoc., Inc. | Denver | CO | 303-742-9700 |
| Landmark Engineering, Ltd. | Loveland | CO | 970-667-6286 |
| LKP Engineering, Inc. | Eagle | CO | 970-926-9088 |
| Mays Construction Specialties Inc. | Grand Junction | CO | 888-724-0692 |
| MCD Professional Consulting, LLC | Aurora | CO | 720-951-0269 |
| Metropolitan State University of Denver | Denver | CO | 303-352-4138 |
| Ninyo & Moore | Greenwood Village | CO | 303-629-6000 |
| Olson Engineering | Wheat Ridge | CO | 303-423-1212 |
| Professional Service Industries, Inc. | Aurora | Col | 510-866-9495 |
| RJH Consultants, Inc. | Englewood | CO | 303-225-4611 |
| RMG Engineers Group | Colorado Springs | CO | 719-548-0600 |
| RockSol Consulting Group, Inc. | Thornton | CO | 303-962-9301 |
| S.H. Smith, P.E., LLC | Cotopaxi | CO | 719-942-3349 |
| Scott, Cox & Assoc., Inc. | Boulder | CO | 303-444-3051 |
| Seaman Corporation | Highlands Ranch | CO | 303.973.3820 |
| SEMA | Centennial | CO | 303-627-2600 |
| Shannon & Wilson, Inc. | Denver | CO | 303-825-3800 |
| Sisson Geoconsulting | Thornton | CO | 720-454-6923 |
| Smith Geotechnical Engineering, Inc. | Fort Collins | CO | 970-490-2620 |
| Soilogic | Greeley | CO | 970-535-6144 |
| Terracon Consultants Inc | Wheat Ridge | CO | 303-423-3300 |
| Terracon Consultants, Inc. | Fort Collins | CO | 970-658-4393 |
| The Reinforced Earth Co. | Englewood | CO | 303-790-1481 |
| US Bureau of Reclamation | Denver | CO | 303-445-2968 |
| Western Engineering & Research Corp. | Denver | CO | 303-757-4000 |
| Yeh & Associates | Denver | CO | 303-781-9590 |
| Yenter Companies, Inc. | Arvada | CO | 303-279-4458 |
