Columbia Equine Hospital Columbia Equine Hospital supports the ambulatory practice that has grown to 4 full time veterinarians and one full time veterinary dentist. The ambulatory practice covers the geographic area of Portland metro and South West Washington. The ambulatory practice 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 Hours of Operation: Monday - Friday 8:00 am - 5:00 pm Saturday 8:00 am - 12:00 pm After Hours Emergency Service (503) 663-1515