| Business | Phone |
| Adkins Consulting Engineers 2950 Shasta Way, Klamath Falls 97603 | (541) 884-4666 |
| Earl E Mason Civil & Struct 1844 Benson Ave, Klamath Falls 97601 | (541) 884-6705 |
| Zbinden-Carter Engineering 900 Klamath Ave, Klamath Falls 97601 | (541) 884-7421 |