Columbia Equine Hospital Columbia Equine Hospital supports the ambulatory practice that has grown to four full time veterinarians and one full time veterinary dentist. The ambulatory practice services the Portland Metro area and South West Washington. Columbia Equine Hospital is focused on performance horses, reproduction, dentistry, preventative medicine, and general equine medicine and surgery. 27841 SE Orient Drive Gresham, Oregon 97080 Phone: (503) 663-1515 Fax: (503) 663-5521 After Hours Emergency Service (503) 663-1515 Hours of Operation: Monday - Friday 8:00 am - 5:00 pm Saturday 8:00 am - 12:00 pm