| Business | Phone |
| Biskey's Forensic Engineering 14523 Westlake Dr, Lake Oswego 97035 | (503) 675-3864 |
| Consulting Engineering Svc 15573 Bangy Rd # 300, Lake Oswego 97035 | (503) 968-6655 |
| Vgo Inc 543 3rd St # Cl2, Lake Oswego 97034 | (503) 635-3734 |
| Hart Crowser Inc 5 Centerpointe Dr # 240, Lake Oswego 97035 | (503) 620-7284 |
| Jacobs Engineering Group Inc 5005 Meadows Rd # 100, Lake Oswego 97035 | (503) 624-3000 |
| Steelman Assoc Ltd 8 N State St # 105, Lake Oswego 97034 | (503) 636-6735 |
| Otak Inc 17355 Boones Ferry Rd, Lake Oswego 97035 | (503) 635-3618 |