| Business | Phone |
| Benchmark Engineering 2905 Se Oak Grove Blvd # 8, Milwaukie 97267 | (503) 659-9371 |
| Cascade Design Professionals 2780 Se Harrison St, Milwaukie 97222 | (503) 652-9090 |
| Compass Engineering-Surveying 6564 Se Lake Rd, Milwaukie 97222 | (503) 653-9093 |